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NDA 2017 GAT · General Knowledge · Current Electricity · easy

An electric heater rated 1 kW is used for 2 hours daily. The energy consumed in one day is

Single correct option

An electric heater rated 1 kW is used for 2 hours daily. The energy consumed in one day is
  1. A. 1 unit
  2. B. 0.5 unit
  3. C. 2 units
  4. D. 200 units
Show answer and solution

Answer: (C) 2 units

One unit of electricity is 1 kilowatt-hour. Energy = power x time = 1 kW x 2 h = 2 kWh, which is 2 units. A 1 kW heater is a high-power appliance, so 200 units is clearly too large. Remember that the commercial unit is kWh, equal to 3.6 x 10^6 J.
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Original question written in the NDA 2017 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake