An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 s.

Answer:

Given

An electric iron of resistance 20 Ω takes a current of 5 A

Find out

We have to calculate the heat developed in 30 s.

Solution

The amount of heat (H) produced is given by the joule’s law of heating as

H= Vlt
Where,
Current (I) = 5 A
Time (t) = 30 s
Voltage (V) = Current x Resistance

V = 5 x 20

V = 100V

H= 100 x 5 x 30

H = 1.5 x 104 J.
Therefore, the amount of heat developed in the electric iron is 1.5 x 104 J.

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