Question

An electric iron of resistance 20Ωtakes a current of 5 A. Calculate the heat developed in 30sec? ​

Answer 1

Answer:

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 = 5 x 20 = 100V

H= 100 x 5 x 30 = 1.5 x 104 J.

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

Hope it helps you.

Answer 2

Answer:

Resistance, R = 20ohm

Current, I = 5A

Time, T = 30sec

Explanation:

H = I^2RT

= (5)^2 × 20 × 30

= 25 × 600

= 15000J