The lightning tag has no usage guidance.
-4
votes
2answers
116 views
Electrical Engineering Puzzle [on hold]
I encountered a puzzle for which I'm sure of the answer. It's simple:
Which cow will survive? Why?
Assume that single strike of lightning is 10^20 electrons.
-4
votes
0answers
21 views
Charge devices use microUSB with Apple lightning cable [on hold]
I'm researching to make an adapter that can convert from Apple Lightning to microUSB. Everything works fine, I get both electric and data with non-MFi cables but unormal with origin Apple Lightning ...
1
vote
1answer
296 views
thin wire on high tension cable
if the thin wire is use for protection from lightning strike in high tension tower, then tell me that how a thin wire can withstand a high voltage lightning strike.It must be melt when light strike on ...
0
votes
3answers
65 views
Should I disconnect appliances if there is lightning? [closed]
Is it safe for electrical appliances to stay connected to the socket when there is lighting, or is it better to disconnect them?
0
votes
0answers
25 views
Do neutral wires need to connect? [migrated]
I'm replacing a few light switches to new WeMo smart switches. The instructions show the neutral wire from the new switch connecting to the existing neutral wire.
I have an outlet with 2 switches and ...
1
vote
0answers
37 views
USB 3.0 wires for data transmission
USB 3.0 has 9 wires.
4 from USB 2.0 (VCC, GND, D+, D-)
+ 5 new for super (SSTX+/-, SSRX+/-, GND)
My Understandings: (these may not be correct)
- USB 3.0 is separated from USB 2.0 and USB 3.0 ...
2
votes
1answer
70 views
Experiment to capture electrical spark
Today my 8-year-old son comes home from school telling me he learned about lightning rods, and he says, "What if we could capture the electricity from lightning and use it to power stuff?" I'm aware ...
0
votes
1answer
52 views
Is it possible for lightning strike to travel up ground / earth pin on a mains outlet?
I live in a country that follows the UK mains specification, where there are 3 pins on a wall outlet with the topmost pin being earth/ground. Now, is it possible that during a lightning strike, extra ...
62
votes
10answers
11k views
Why did LEDs take so long to appear as light bulbs?
LEDs are an old technology, why did the industries take so long to put them into light bulbs? Was there any technological gap missing?
0
votes
3answers
52 views
Lightning surge protection
I'm considering buying a lightning protection unit for my electronics at home and would love some assistance in understanding how it all works. I live in an area where lightning strikes are very ...
0
votes
1answer
66 views
Designing a switch box for lights
I need to build a box with 12 momentary push button switches for 12 separate lighting sources. I plan to plug 12 fluorescent lights into the box, then I'd like to control the lights with the push ...
-1
votes
1answer
48 views
Will a 110-220v to 12v converter work with a DC 12v 3w LED bulb? [closed]
I'm planning to create some wall lights using these LED bulbs. Would I be able to just use any 110-220v to 12v converter to power this at home? I live in the US (120v).
I was thinking of using this ...
1
vote
3answers
106 views
New led lights flickering in shop
I have replaced several light fixtures with LED in my company. The 400 watt hi-bays I replaced with 95 watt LED. They work great.
I replaced a set of office lights that were track halogen with 7 watt ...
4
votes
3answers
128 views
Why is USB type C connector hollow?
If we look, for instance, at a Lightning cable, its connector is shaped like "—", with receptacle being "=". Apparently, this construction contributes to durability, to the ease of use, and lowers ...
16
votes
3answers
2k views
Why is the power consumption of electrical lamps specified in kWh/1000h?
This is the box of a LED spot I just bought. I'm wondering why the power consumption is measured in kWh/1000h and not simply in Watts.
Edit:
The labeling standard can be found here. (Guide for the ...
-1
votes
1answer
70 views
Why does USB Type-C have the connectors on the inside instead of the outside?
I can see arguments for both, but is there a specific reason why the USB working group decided on having the connectors on the inside? Is there a specific reason the lightning connector decided on ...
0
votes
1answer
108 views
Amount of light by an LED
I am supposed to use an light having the following specs. as described in the below statement.
"A red light, equivalent in its luminescence to a 21 W light bulb is to be used."
On an average how ...
2
votes
1answer
1k views
direct ZigBee communication with Philips Hue smart light bulbs
Philips Hue light bulbs use a Bridge(transmitter) to connect between your network and their smart lights via a ZigBee protocol called Light Link. Can you control the lights directly with your own ...
0
votes
0answers
209 views
COB LED on Aluminum tubes as heat sink
Thanks in advance for any contribution to my project, I'm afraid I'm pretty illiterate in terms of physics, heat dissipation, etc.
I want to build a light with COB leds mounted on aluminum tubes, I ...
3
votes
2answers
181 views
Preventing Arduino from getting lightning strikes and protecting it
I want to use an Arduino as a weather station and I want to put it high up in a tree. It should be independent and powered by solar panels. This is where the problem starts.
Lightning strikes occur ...
0
votes
2answers
1k views
Calculate number of photons of a light source given the lumen and the color spectrum [closed]
Is there any program that given the lumen and the colour spectrum (relative intensity at any wavelength) of a light source and it outputs the total amount of photons per wavelength?
0
votes
2answers
84 views
Induction loop for catching lightning?
Recent thunderstorm, and a big overhead cloud to cloud lightning flash. Coincident with it, sparks jumped from a metal chair in the house. Would it be possible to get a spark from a loop of cable ...
0
votes
1answer
93 views
Can a metal pipe shield wiring against EMP during a nearby lightning strike?
I have a building which regularly experiences nearby lightning strikes. The backup diesel generator is located 10 meters away from the building. Can induced currents from the EMP be reduced within the ...
2
votes
2answers
279 views
Creating an isolated power supply to prevent effects of lightning
Transformers isolate the load completely from the primary power source. Does that mean that I can connect two or more transformers one after the other and expect my Linear Power Supply to have better ...
4
votes
2answers
317 views
Protecting a tethered floating device from Lightning strikes
I am building a device, current as a proof of concept, but I would like to have it in place for a long period of time (over a year) with minimal maintenance.
The device is powered by an array of ...
0
votes
1answer
132 views
What would happen to the wires if a lightning struck them? [closed]
I've got a link to this video of a lightning striking wiring between two houses in a city: http://www.youtube.com/watch?v=bLPFeW40Xrc
I wonder if the wires were melted by the current (as commenters ...
10
votes
3answers
15k views
Why do thunderstorms knock out power?
It isn't like lightning strikes the wires. And surely the whole apparatus is designed to be water-proof. So what is it that causes power outages during thunderstorms?
