Question

An electric iron of resistance 20 ohms draws current of 5 amperes. Calculate the heat produced in 30 seconds

Answer 1

hello friend...!!

• According to the question we should calculate the heat produced.

• Given clue :

1 ) resistance ( R) = 20 ohm

2) current ( I ) = 5 ampere

3 ) time ( T) = 30 seconds

We know that

$h \: \: = {i}^{2} rt$

therefore

H = 5 x 5 x 20 x 30

therefore

H = 15000. Joules

thus the amount of heat produce is 15000.joules

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Hope it is useful...!!

Answer 2

Given :-

R = 20 Ω

I = 5 A

t = 30 s

H = I^2Rt

= (5)^2×20×30

= 15000 J

= 1.5 × 10^4 J