Question

What do you understand Joule’s law of heating. An electric iron of resistance 20 Ω takes a current of 5A . Calculate the heat developed in 30 s.

Answer 1

Answer:

H = 15000 J/s

Explanation:

Joule's Law of Heating states that Heat produced through a current carrying conductor is directly proportional to the

•Square of the current

•Resistance through which the current flows

•Time for which the current flows through the resistor

Formula: H = I²Rt

Resistance = 20 Ω

Current = 5A

Time = 30 sec

H = I²Rt

H = 5 × 5 × 20 × 30

H = 25 × 600

H = 15,000 J/s