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Write down the formula for the heat produced when a current I is passed through a resistor R for time (b) An electric iron of resistance 20 ohms draws a current of 5 amperes. Calculate the heat produced in 30 seconds.

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(a) Write down the formula for the heat produced when a current I is passed through a resistor R for time

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

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(a) Heat produced, H = I2t

(b) Given: R = 20 ohm, I = 5 amp, t = 30s

We know that H = I2Rt

H = 52 x 20 x 30

H = 15000J

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