Tagged Questions
0
votes
2answers
46 views
Light bulbs, Wattage meaning? [closed]
Light bulbs, Wattage meaning?
Two incandescent bulbs (120 V, 25 Watt) and (120 V, 500 Watt) connected to the same batteries.
Which one shines brighter? And why?
3
votes
1answer
119 views
Does light induce an electric current in a conductor?
I know that electromagnetic waves induce electric currents in conductors and that's the basis for radio, wi-fi etc.
I also know that light is also an electromagnetic wave. So, can light induce a ...
4
votes
1answer
197 views
why sometimes touching old flickering tube lights starts them properly
In my old house there are two old tube lights. Some times they don't start properly, (specially at evening time, may be it is because of low voltage), they starts flickering i.e. on and off ...
0
votes
2answers
70 views
Is an electric lamp a transducer? [closed]
Silly thought.
A transducer, by definition, is a device that converts variations in one form of energy to another. An electric lamp converts electricity into visible light - the brightness may vary ...
9
votes
5answers
935 views
Can someone explain the science behind MIT's 230% efficient LEDs?
I was reading Gizmodo the other day and I didn't quite understand the Physics behind this. Could anybody shed some light on how this effect actually works?
1
vote
2answers
1k views
How do I calculate the power consumed by a lightbulb?
I'm studying a lightbulb and its variable resistance, given by the expression:
$R(T) = Ro[1 + α(T-T_0)]$, where $R_0$ is the resistance of the lamp at $T_0$.
In this case, $R$ is not given by Ohm's ...
