Grade 9 Electricity Practice Exam 2026 - Free Practice Questions and Study Guide

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What is a kilowatt-hour (kWh)?

A unit of power.

A unit of energy equal to one kilowatt used for one hour; used on electricity bills.

A unit of charge.

A unit of resistance.

A kilowatt-hour is a unit of energy, not power. It measures how much energy is used or transferred over time. One kilowatt-hour means a device with a power rating of one kilowatt runs for one hour, consuming that amount of energy. In other words, energy equals power multiplied by time, so 1 kW for 1 hour equals 1 kWh, which is about 3.6 million joules. This is the unit you’ll typically see on electricity bills to express total energy consumption. It’s not a unit of power (that would be watts), not a unit of charge (coulombs), and not a unit of resistance (ohms).