Question

An electric heater of resistance 100ohm draws a current of 10A from the supply. Calculate the heat producer by an heater In 2 hours

Answer 1

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Answer 2

Answer:

72,000 KJ

Explanation:

Given:

• Resistance of electric heater = r = 100 ohms

• Current drawn by elecrtic heater = i = 10 Amperes
• Time = t = 2 hours

To find:

• Heat produced in 2 hours

Heat produced = i²rt

Where:

i = current

r = resistance

t = time

Time = 2 hours = 120 minutes = 7200 seconds

Heat produced = $10^{2} \times 100 \times 7200$

Heat produced = $100 \times 100 \times 7200$

Heat produced = $72000000 \ J$

Heat produced = 72,000 KJ

The heat produced is equal to 72,000 kilojoules