Question

How much heat will an instrument of 12 W produce in one minute if it is connected to a battery of 12 V?

Answer 1

Given: P = 12 W

V = 12 V

T = 60 s

We know that,

P = VI

I = `P/V`

I = `12/12`

I = 1 ampere

V = IR

R = `V/I`

R = `12/1`

R = 12 ohms

H = I²RT

H = 1² × 12 × 60

H = 1 × 720

H = 720 J