The p.d. across a lamp is 12V. How many joules of electrical energy are change into heat and light when :
(a) a charge of 1C passes through it ?
(b) a charge of 5C passes through it ?
(c) a current of 2A flows through it for 10s ?
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Explanation:
The work done by the lamp(heat) = potential difference× charge
a.when a charge of 1C passes through the lamp:
W= 12V/1C= 12J
b. When a charge of 5C passes through the lamp,
W= 12V/5C = 2.4J
c. When a current of 2A passes through it for 10s,
charge = current × time
Q= 2A× 10s
= 20C
So W= 12V/ 20C
= 0.6J
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