I have this question that i dont understand:
A 36W lamp draws a constant current of 3.0A over a period of 600s from a battery. Calculate the number of electrons passing through the lamp.
I have already worked out: the p.d across the lamp= 12V
the energy transferred by the lamp= 21600J
the charge passing through the lamp= 1800C
thanks in advance
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- Thread Starter
- 11-03-2013 16:43
- 11-03-2013 16:49
1A = 1 coulomb per second, so for 3A in 600s how many coulombs?
Then 1 coulomb = how many electrons? (remember - 1 elementary charge = 1.602x10^-19 C)
Multiply these together and you're sorted.
I thinkLast edited by alex193; 11-03-2013 at 19:01.
- 11-03-2013 17:43
Thanks for helping.
Can I direct you to the guidance notes for posting here
in particular the request not to provide complete solutions to numerical problems. The aim is to help the poster help himself. As he had almost got to the solution, a small prod in the right direction was all that was needed.
Thanks for your cooperation.
- 11-03-2013 17:50
Oops, should probably have read that first
- 11-03-2013 18:50