Why is one lightbulb in a string illuminated? Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30pm US/Eastern) Announcing the arrival of Valued Associate #679: Cesar Manara Unicorn Meta Zoo #1: Why another podcast?HSR412 (solid state relay) parallel circuit connection not working?Why is this light in this parallel circuit only working in series?Is this the ideal parallel circuit or is this a combination of series and parallel?Full Spectrum LED(400nm~840nm) vs Grow Light LED (RED+BLUE)Wiring a bunch of micro LED fairy lights to a single power source in parallelWEMO switch and Sodium lightingChoosing the right transformer to replace batteries?1-wire fairy lightsHigh(er) Current AC Flasher CircuitLED Light changes color on being turned on/off simultaneously
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Why is one lightbulb in a string illuminated?
Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30pm US/Eastern)
Announcing the arrival of Valued Associate #679: Cesar Manara
Unicorn Meta Zoo #1: Why another podcast?HSR412 (solid state relay) parallel circuit connection not working?Why is this light in this parallel circuit only working in series?Is this the ideal parallel circuit or is this a combination of series and parallel?Full Spectrum LED(400nm~840nm) vs Grow Light LED (RED+BLUE)Wiring a bunch of micro LED fairy lights to a single power source in parallelWEMO switch and Sodium lightingChoosing the right transformer to replace batteries?1-wire fairy lightsHigh(er) Current AC Flasher CircuitLED Light changes color on being turned on/off simultaneously
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$begingroup$
I noticed that in various strings of lights only one was illuminated. It seems implausible that all but one out of several hundred blew. What caused this and why did this particular light turn on?
parallel lighting
New contributor
$endgroup$
add a comment |
$begingroup$
I noticed that in various strings of lights only one was illuminated. It seems implausible that all but one out of several hundred blew. What caused this and why did this particular light turn on?
parallel lighting
New contributor
$endgroup$
1
$begingroup$
I think there is too less information to answer this question without speculation, and there is probably neither no way to validate an answer in order to accept it.
$endgroup$
– Huisman
3 hours ago
$begingroup$
Never seen serial streetlights on cables from street-corners before. But if there enough mutual coupling to power 1 bulb out of say 30 in series. The bulb with the fastest warm-up time draws all the induced voltage ( e.g. 240/30) due to 10:1 PTC effects
$endgroup$
– Sunnyskyguy EE75
3 hours ago
$begingroup$
Looks a lovely park not far from the Welsh coast
$endgroup$
– Sunnyskyguy EE75
3 hours ago
$begingroup$
How about this: The lamps are on a photocell-switched circuit, but one lamp is lit constantly to indicate that the circuit is powered. It's not dark enough to trigger to photocell switch.
$endgroup$
– Hot Licks
9 mins ago
add a comment |
$begingroup$
I noticed that in various strings of lights only one was illuminated. It seems implausible that all but one out of several hundred blew. What caused this and why did this particular light turn on?
parallel lighting
New contributor
$endgroup$
I noticed that in various strings of lights only one was illuminated. It seems implausible that all but one out of several hundred blew. What caused this and why did this particular light turn on?
parallel lighting
parallel lighting
New contributor
New contributor
New contributor
asked 5 hours ago
dothyphendotdothyphendot
1161
1161
New contributor
New contributor
1
$begingroup$
I think there is too less information to answer this question without speculation, and there is probably neither no way to validate an answer in order to accept it.
$endgroup$
– Huisman
3 hours ago
$begingroup$
Never seen serial streetlights on cables from street-corners before. But if there enough mutual coupling to power 1 bulb out of say 30 in series. The bulb with the fastest warm-up time draws all the induced voltage ( e.g. 240/30) due to 10:1 PTC effects
$endgroup$
– Sunnyskyguy EE75
3 hours ago
$begingroup$
Looks a lovely park not far from the Welsh coast
$endgroup$
– Sunnyskyguy EE75
3 hours ago
$begingroup$
How about this: The lamps are on a photocell-switched circuit, but one lamp is lit constantly to indicate that the circuit is powered. It's not dark enough to trigger to photocell switch.
$endgroup$
– Hot Licks
9 mins ago
add a comment |
1
$begingroup$
I think there is too less information to answer this question without speculation, and there is probably neither no way to validate an answer in order to accept it.
$endgroup$
– Huisman
3 hours ago
$begingroup$
Never seen serial streetlights on cables from street-corners before. But if there enough mutual coupling to power 1 bulb out of say 30 in series. The bulb with the fastest warm-up time draws all the induced voltage ( e.g. 240/30) due to 10:1 PTC effects
$endgroup$
– Sunnyskyguy EE75
3 hours ago
$begingroup$
Looks a lovely park not far from the Welsh coast
$endgroup$
– Sunnyskyguy EE75
3 hours ago
$begingroup$
How about this: The lamps are on a photocell-switched circuit, but one lamp is lit constantly to indicate that the circuit is powered. It's not dark enough to trigger to photocell switch.
$endgroup$
– Hot Licks
9 mins ago
1
1
$begingroup$
I think there is too less information to answer this question without speculation, and there is probably neither no way to validate an answer in order to accept it.
$endgroup$
– Huisman
3 hours ago
$begingroup$
I think there is too less information to answer this question without speculation, and there is probably neither no way to validate an answer in order to accept it.
$endgroup$
– Huisman
3 hours ago
$begingroup$
Never seen serial streetlights on cables from street-corners before. But if there enough mutual coupling to power 1 bulb out of say 30 in series. The bulb with the fastest warm-up time draws all the induced voltage ( e.g. 240/30) due to 10:1 PTC effects
$endgroup$
– Sunnyskyguy EE75
3 hours ago
$begingroup$
Never seen serial streetlights on cables from street-corners before. But if there enough mutual coupling to power 1 bulb out of say 30 in series. The bulb with the fastest warm-up time draws all the induced voltage ( e.g. 240/30) due to 10:1 PTC effects
$endgroup$
– Sunnyskyguy EE75
3 hours ago
$begingroup$
Looks a lovely park not far from the Welsh coast
$endgroup$
– Sunnyskyguy EE75
3 hours ago
$begingroup$
Looks a lovely park not far from the Welsh coast
$endgroup$
– Sunnyskyguy EE75
3 hours ago
$begingroup$
How about this: The lamps are on a photocell-switched circuit, but one lamp is lit constantly to indicate that the circuit is powered. It's not dark enough to trigger to photocell switch.
$endgroup$
– Hot Licks
9 mins ago
$begingroup$
How about this: The lamps are on a photocell-switched circuit, but one lamp is lit constantly to indicate that the circuit is powered. It's not dark enough to trigger to photocell switch.
$endgroup$
– Hot Licks
9 mins ago
add a comment |
2 Answers
2
active
oldest
votes
$begingroup$
Figure 1. The intriguing light bulb has caught the attention of Smokey the Bear too.
There can only be a few possibilities:
- The lamps are spread across several phases or split phases, the other phases are off and all but this lamp has blown. This is very unlikely.
- Some joker has installed a battery powered lamp. This too seems unlikely.
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." Sherlock Holmes.
- The impossible has happened and all have blown but one. This could happen with an overvoltage - by lightning, for example. Some combination of poor contact, tough filament, arcing in another lamp (which would limit the voltage), etc., may be enough to let it survive.
Another possibility is that the power is on and that each bulb has its own light sensor (like some streetlights) and this one is the first to switch on. Again, unlikely.
$endgroup$
$begingroup$
I'd go with the battery powered hypothesis, there are available lamps that include a battery back-up
$endgroup$
– Jasen
4 hours ago
$begingroup$
Are these lamps connected in series or parallel? Or several series strings in parallel?
$endgroup$
– Toor
4 hours ago
$begingroup$
looks like parallel festoon fittings to me
$endgroup$
– Jasen
4 hours ago
$begingroup$
Then the o/v has my vote. Someone may have fitted a single 275V (very likely 260V) globe as a spare. We had these in Western Australia for a long time and they lasted forever back when we were 250V and the rest of the country 240V. (almost always higher in both cases).
$endgroup$
– mckenzm
39 mins ago
add a comment |
$begingroup$
I'd go with the implausible explanation. All the bulbs are blown except the one.
Most festoon lights use a screw-in socket so all the lights are in parallel:
I'd suggest that the string was perhaps hit by a truck (or a surge) and a bunch of the lights broke.
$endgroup$
add a comment |
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2 Answers
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active
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2 Answers
2
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active
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active
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votes
$begingroup$
Figure 1. The intriguing light bulb has caught the attention of Smokey the Bear too.
There can only be a few possibilities:
- The lamps are spread across several phases or split phases, the other phases are off and all but this lamp has blown. This is very unlikely.
- Some joker has installed a battery powered lamp. This too seems unlikely.
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." Sherlock Holmes.
- The impossible has happened and all have blown but one. This could happen with an overvoltage - by lightning, for example. Some combination of poor contact, tough filament, arcing in another lamp (which would limit the voltage), etc., may be enough to let it survive.
Another possibility is that the power is on and that each bulb has its own light sensor (like some streetlights) and this one is the first to switch on. Again, unlikely.
$endgroup$
$begingroup$
I'd go with the battery powered hypothesis, there are available lamps that include a battery back-up
$endgroup$
– Jasen
4 hours ago
$begingroup$
Are these lamps connected in series or parallel? Or several series strings in parallel?
$endgroup$
– Toor
4 hours ago
$begingroup$
looks like parallel festoon fittings to me
$endgroup$
– Jasen
4 hours ago
$begingroup$
Then the o/v has my vote. Someone may have fitted a single 275V (very likely 260V) globe as a spare. We had these in Western Australia for a long time and they lasted forever back when we were 250V and the rest of the country 240V. (almost always higher in both cases).
$endgroup$
– mckenzm
39 mins ago
add a comment |
$begingroup$
Figure 1. The intriguing light bulb has caught the attention of Smokey the Bear too.
There can only be a few possibilities:
- The lamps are spread across several phases or split phases, the other phases are off and all but this lamp has blown. This is very unlikely.
- Some joker has installed a battery powered lamp. This too seems unlikely.
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." Sherlock Holmes.
- The impossible has happened and all have blown but one. This could happen with an overvoltage - by lightning, for example. Some combination of poor contact, tough filament, arcing in another lamp (which would limit the voltage), etc., may be enough to let it survive.
Another possibility is that the power is on and that each bulb has its own light sensor (like some streetlights) and this one is the first to switch on. Again, unlikely.
$endgroup$
$begingroup$
I'd go with the battery powered hypothesis, there are available lamps that include a battery back-up
$endgroup$
– Jasen
4 hours ago
$begingroup$
Are these lamps connected in series or parallel? Or several series strings in parallel?
$endgroup$
– Toor
4 hours ago
$begingroup$
looks like parallel festoon fittings to me
$endgroup$
– Jasen
4 hours ago
$begingroup$
Then the o/v has my vote. Someone may have fitted a single 275V (very likely 260V) globe as a spare. We had these in Western Australia for a long time and they lasted forever back when we were 250V and the rest of the country 240V. (almost always higher in both cases).
$endgroup$
– mckenzm
39 mins ago
add a comment |
$begingroup$
Figure 1. The intriguing light bulb has caught the attention of Smokey the Bear too.
There can only be a few possibilities:
- The lamps are spread across several phases or split phases, the other phases are off and all but this lamp has blown. This is very unlikely.
- Some joker has installed a battery powered lamp. This too seems unlikely.
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." Sherlock Holmes.
- The impossible has happened and all have blown but one. This could happen with an overvoltage - by lightning, for example. Some combination of poor contact, tough filament, arcing in another lamp (which would limit the voltage), etc., may be enough to let it survive.
Another possibility is that the power is on and that each bulb has its own light sensor (like some streetlights) and this one is the first to switch on. Again, unlikely.
$endgroup$
Figure 1. The intriguing light bulb has caught the attention of Smokey the Bear too.
There can only be a few possibilities:
- The lamps are spread across several phases or split phases, the other phases are off and all but this lamp has blown. This is very unlikely.
- Some joker has installed a battery powered lamp. This too seems unlikely.
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." Sherlock Holmes.
- The impossible has happened and all have blown but one. This could happen with an overvoltage - by lightning, for example. Some combination of poor contact, tough filament, arcing in another lamp (which would limit the voltage), etc., may be enough to let it survive.
Another possibility is that the power is on and that each bulb has its own light sensor (like some streetlights) and this one is the first to switch on. Again, unlikely.
edited 3 hours ago
answered 4 hours ago
TransistorTransistor
89.4k786192
89.4k786192
$begingroup$
I'd go with the battery powered hypothesis, there are available lamps that include a battery back-up
$endgroup$
– Jasen
4 hours ago
$begingroup$
Are these lamps connected in series or parallel? Or several series strings in parallel?
$endgroup$
– Toor
4 hours ago
$begingroup$
looks like parallel festoon fittings to me
$endgroup$
– Jasen
4 hours ago
$begingroup$
Then the o/v has my vote. Someone may have fitted a single 275V (very likely 260V) globe as a spare. We had these in Western Australia for a long time and they lasted forever back when we were 250V and the rest of the country 240V. (almost always higher in both cases).
$endgroup$
– mckenzm
39 mins ago
add a comment |
$begingroup$
I'd go with the battery powered hypothesis, there are available lamps that include a battery back-up
$endgroup$
– Jasen
4 hours ago
$begingroup$
Are these lamps connected in series or parallel? Or several series strings in parallel?
$endgroup$
– Toor
4 hours ago
$begingroup$
looks like parallel festoon fittings to me
$endgroup$
– Jasen
4 hours ago
$begingroup$
Then the o/v has my vote. Someone may have fitted a single 275V (very likely 260V) globe as a spare. We had these in Western Australia for a long time and they lasted forever back when we were 250V and the rest of the country 240V. (almost always higher in both cases).
$endgroup$
– mckenzm
39 mins ago
$begingroup$
I'd go with the battery powered hypothesis, there are available lamps that include a battery back-up
$endgroup$
– Jasen
4 hours ago
$begingroup$
I'd go with the battery powered hypothesis, there are available lamps that include a battery back-up
$endgroup$
– Jasen
4 hours ago
$begingroup$
Are these lamps connected in series or parallel? Or several series strings in parallel?
$endgroup$
– Toor
4 hours ago
$begingroup$
Are these lamps connected in series or parallel? Or several series strings in parallel?
$endgroup$
– Toor
4 hours ago
$begingroup$
looks like parallel festoon fittings to me
$endgroup$
– Jasen
4 hours ago
$begingroup$
looks like parallel festoon fittings to me
$endgroup$
– Jasen
4 hours ago
$begingroup$
Then the o/v has my vote. Someone may have fitted a single 275V (very likely 260V) globe as a spare. We had these in Western Australia for a long time and they lasted forever back when we were 250V and the rest of the country 240V. (almost always higher in both cases).
$endgroup$
– mckenzm
39 mins ago
$begingroup$
Then the o/v has my vote. Someone may have fitted a single 275V (very likely 260V) globe as a spare. We had these in Western Australia for a long time and they lasted forever back when we were 250V and the rest of the country 240V. (almost always higher in both cases).
$endgroup$
– mckenzm
39 mins ago
add a comment |
$begingroup$
I'd go with the implausible explanation. All the bulbs are blown except the one.
Most festoon lights use a screw-in socket so all the lights are in parallel:
I'd suggest that the string was perhaps hit by a truck (or a surge) and a bunch of the lights broke.
$endgroup$
add a comment |
$begingroup$
I'd go with the implausible explanation. All the bulbs are blown except the one.
Most festoon lights use a screw-in socket so all the lights are in parallel:
I'd suggest that the string was perhaps hit by a truck (or a surge) and a bunch of the lights broke.
$endgroup$
add a comment |
$begingroup$
I'd go with the implausible explanation. All the bulbs are blown except the one.
Most festoon lights use a screw-in socket so all the lights are in parallel:
I'd suggest that the string was perhaps hit by a truck (or a surge) and a bunch of the lights broke.
$endgroup$
I'd go with the implausible explanation. All the bulbs are blown except the one.
Most festoon lights use a screw-in socket so all the lights are in parallel:
I'd suggest that the string was perhaps hit by a truck (or a surge) and a bunch of the lights broke.
answered 3 hours ago
Jack CreaseyJack Creasey
15.4k2823
15.4k2823
add a comment |
add a comment |
dothyphendot is a new contributor. Be nice, and check out our Code of Conduct.
dothyphendot is a new contributor. Be nice, and check out our Code of Conduct.
dothyphendot is a new contributor. Be nice, and check out our Code of Conduct.
dothyphendot is a new contributor. Be nice, and check out our Code of Conduct.
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1
$begingroup$
I think there is too less information to answer this question without speculation, and there is probably neither no way to validate an answer in order to accept it.
$endgroup$
– Huisman
3 hours ago
$begingroup$
Never seen serial streetlights on cables from street-corners before. But if there enough mutual coupling to power 1 bulb out of say 30 in series. The bulb with the fastest warm-up time draws all the induced voltage ( e.g. 240/30) due to 10:1 PTC effects
$endgroup$
– Sunnyskyguy EE75
3 hours ago
$begingroup$
Looks a lovely park not far from the Welsh coast
$endgroup$
– Sunnyskyguy EE75
3 hours ago
$begingroup$
How about this: The lamps are on a photocell-switched circuit, but one lamp is lit constantly to indicate that the circuit is powered. It's not dark enough to trigger to photocell switch.
$endgroup$
– Hot Licks
9 mins ago