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26/07/2021 3:38 pm
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When a current of 4.0 A passes through a certain resistor for 10 minutes, 2.88 x 104 J of heat are produced. Calculate :
(a) the power of the resistor.
(b) the voltage across the resistor.
1 Answer
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26/07/2021 3:42 pm
Given: I = 4 amp, t = 10 min = 10 x 60 = 600 sec, H = 2.88 x 104 J
(a) We have
H = I2RT
28800 = 42 x R x 600
R = 3 ohms
We know that
P = I2 x R
= 42 x 3
P = 48W
(b) V = ?
We know that
V = IR
V = 4 x 3
V = 12V