3 ms·
Correct, but it is the rate of change that is more crucial. Just like 60 mph isn't hugely fast, but we still quote 0 to 60 times.
by thomasfedb 8y ago
Correct, but it is the rate of change that is more crucial.
Just like 60 mph isn't hugely fast, but we still quote 0 to 60 times.
- jacquesm 8y agoAh now I get it. Thank you very much!
- amelius 8y agoSo when I turn on the light at home, what is the increase in current typically, order of magnitude?
- FPGAhacker 8y agoin America household voltage for lighting is usually 110volts AC RMS. And you could divide that by the resistance of the bulb to get current. Or take the power rating and divide that by 110. So a 100 watt bulb is close to an amp. As to the rate, you could use an oscilloscope or a high speed camera.
- thomasfedb 8y agoDecent question, I'm not sure how to calculate that and a cursory Google didn't find me an answer. Household power is AC, I'm sure that will have an impact. For example, switching on the circuit when the voltage is instantaneous 0V would surely result in no change in the flow of current. All you'd have in that scenario would be the rate of change of AC, which would be 10A at 50Hz = 2000 A/s in Australia (1Hz = +240 to -240 and back in 1s). I'm sure this is hopelessly simplistic though, nothing happens instantaneously - there will be some period of high-resistance arking, etc.
- amelius 8y agoI think this concept explains it: https://en.wikipedia.org/wiki/Parasitic_element_(electrical_networks) https://en.wikipedia.org/wiki/Parasitic_element_(electrical_... So instead of modeling your home wiring as wires, you should model them as wires plus capacitances, inductances and resistances. The loop from light switch to lamp and back is basically one "big" inductor. The challenge is to find adequate values for these parasitic elements. You are right about AC though, didn't think of that.