Question

An electric iron of resistance 20ohm takes a current of 5A calculate the heat developed in 30 seconds

Answer 1

Answer:

Given, resistance R = 20ohm ,

current I = 5A & time t = 30sec

we know that

heat = {current}^{2} \times resistance \times time \\ = > h = {i}^{2} \times r \times t

now put the given value , we get

h = {5}^{2} \times 20 \times 30 = 25 \times 600 \\ \: \: \: \: \: \: = 15000joule

Answer 2

Answer:

H=15000

Explanation:

H equal to I square RT .

therefore h is equal to 5 ^2* 20 * 30 which is equal to 15,000 joules