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A current of 0.2 A flows through a wire whose ends are at a potential difference of 15 V. Calculate: (i)The resistance of the wire, and (ii)The heat energy produced in 1 minute.
A current of 0.2 A flows through a wire whose ends are at a potential difference of 15 V. Calculate:
(i)The resistance of the wire, and
(ii)The heat energy produced in 1 minute.
Class 10 | Current Energy | ICSE | Physics | Selina
A current of 0.2 A flows through a wire whose ends are at a potential difference of 15 V. Calculate:
(i)The resistance of the wire, and
(ii)The heat energy produced in 1 minute.

Given,

I = 0.2 A current

V = 15 V potential difference

t = 60 seconds

Because V = IR,

(a) Determining the wire’s resistance

V / I = R

R = 0.2 / 15

R = 75 ohm

(b) Determine the amount of heat energy produced in one minute.

H = I2Rt

H = (0.2)2 × 75 × 60
H = 180 J

i

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