Power and efficiency

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Question 3
Easy
a.

A commercial refrigeration unit operates with a continuous power consumption of 2.4 kW2.4\text{ kW}2.4 kW.

Calculate the total electrical energy consumed by the unit, in textkWhtext{kWh}textkWh, over a period of 14 hours14\text{ hours}14 hours of continuous operation.

[2]
b.

An electric scooter motor is powered by a 36.0 V36.0\text{ V}36.0 V battery pack. Under a specific load, the motor draws a steady current of 12.4 A12.4\text{ A}12.4 A.

Calculate the electrical power delivered to the motor, in textWtext{W}textW.

[2]

Power and efficiency Questions

  1. GCSE
  2. /Physics
  3. /Power and efficiency