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# Coulomb exam question. See question 6(f) on page 14 in the…

Coulomb exam question. See question...
Coulomb exam question. See question 6(f) on page 14 in the GCSE exam located at: http://www.ocr.org.uk/download/pp_10_jan/ocr_50310_pp_10_jan_gcse_a332_02.pdf I know that the answer to this question is "3 Joules". I would like an explanation of this question and answer. My working assumption is that for a 3V battery in this circuit, it supplies 3 Joules per Coulomb. So the question says "How much energy is transferred by 1 coulomb of charge to the 2 ohm resister?", I assume that the solution is simply 1 coulomb x 3 Joules per coulomb = 3 Joules. So, 3 Joules is transferred to the 2 ohm resister and, for that matter, 3 joules is transferred to the 4 ohm resister too because the resistors are in parallel! Is this correct?
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1/2/2011
namstech, Electrical Engineer
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As per definition of energy supplied by a given voltage, 3 V will supply each coulomb of charge with 3 joule of energy. This implies that each coulomb of charge flowing through the circuit carries 3 joules of energy, no matter whether it is flowing through 2 Ohm resistance or 4 Ohm resistance. So energy carried by 1 coulomb of charge through the circuit is 3 Joules.

The value of resistance limits the number of coulombs flowing through it per unit time (current) but the energy carried by the every coulomb remains the same.

I hope this explanation helps.

Edited by Najeeb on 1/2/2011 at 3:33 PM EST
Customer reply replied 7 years ago
So would the answer be the same no matter what the ohms rating of the resisters where? Eg., if the resistors were 4 ohms and 20 ohms, respectively, the energy transfered to each would be 3 Joules?
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