An immersion heater of 400 watts kept on for 5 hours will consume electrical power of?
Correct answer: A. 2 kWh
- A. 2 kWh
- B. 20 kWh
- C. 6 kWh
- D. 12 kWh
Explanation
To calculate the electrical power consumed by the immersion heater, you can use the formula: Power (P) = Voltage (V) × Current (I) Given that the heater's power rating is 400 watts, and assuming it operates at the standard household voltage of 220 volts: Power (P) = 400 watts Voltage (V) = 220 volts Now, we need to calculate the current (I) using Ohm's Law: Current (I) = Power (P) / Voltage (V) Current (I) = 400 watts / 220 volts Once we have the current, we can calculate the total electrical energy consumed using the formula: Energy (E) = Power (P) × Time (t) Given that the heater is kept on for 5 hours: Energy (E) = 400 watts × 5 hours Now, plug in the values and calculate: Current (I) = 400 watts / 220 volts ≈ 1.818 Amperes Energy (E) = 400 watts × 5 hours = 2000 watt-hours (Wh) or 2 kilowatt-hours (kWh) So, the immersion heater will consume electrical power of 2 kilowatt-hours (kWh) when kept on for 5 hours.
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