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Question

An electric immersion heater with a resistance of 40 ohms is connected to a 240 V power supply. Calculate the current flowing through the heater and the amount of heat energy produced by the heater in 30 minutes.

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Solution

An electric immersion heater with a resistance of 40 ohms is connected to a 240 V power supply. $H e a t = \frac{V^{2} * t}{R} = \frac{240^{2} * 30 m i n}{40 * 60} = 720 J / h$

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