Question

The P.D across a lamp is 12V.How many joules of electrical energy are changed into heat and light when

a) a charge of 1 coulomb pass through it
b) a charge of 5 coulomb pass thru it
c)A current of 2 ampere flows thru it for 10 seconds.

Class 10 Electricity S.Chand

Answer 1

1. V = W/Q
12 = W/1
12 = W
Work done = 12 joules

2. V = W/Q
12 = W/5
12 x 5 = W
60 = W
word done = 60 joules

3. I= Q/t
2 = Q/10
Q = 10 x 2
Q = 20 coulombs
V = W/Q
12 = W/20
20 x 12 = W
W = 240 joules

Answer 2

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