Write down the formula for the heat produced when a current I is passed through a resistor R for time t. b) An electric iron of resistance 20 ohms draws a current of 5 amperes. Calculate the heat produced in 30 seconds.
ScienceClass 10ICSEAnswered 27 Mar 2026
Answer
- Following is the formula for the heat produced:
H = I2Rt
- Given, R = 20Ω
I = 5amp t = 30s
We know that, H = I2Rt
Substituting the values we get, H = 15000J