Question

An electric heater iron of resistance 20ohms.calcualte the heat developed in 30seconds​

Answer 1

Given Resistance 20 Ohm

Current = 5A

Time = 30s

So, Heat = I(square)*R*T

25*20*30 = 500*30 = 15000

= 1.5x10(power 4) J

Answer 2

Answer:

(R) = 20 Ω

(I)= 5 A

(t)= 30 s

Now we know that H= I2Rt

use it here = 5×5×20×30

= 15000J=1.5×104J

The heat developed in 30s is 1.5×104J

hope it help u