Commercial Unit
The commercial unit of electrical energy is kilowatt-hour, written as kWh.
Practice This ConceptMain explanation
Teacher explanation
Electricity bills use kWh because home energy use is large and easier to express in this unit. One kWh means using 1 kilowatt of power for 1 hour. It is called one unit in billing language.
Example
A 1 kW heater used for 2 hours consumes 2 kWh, or 2 units.
Simple analogy
kWh means power multiplied by hour.
Common confusion
Students often confuse kWh with kW and forget that time must be included.
Exam tip
Convert power and time carefully before finding units consumed in billing questions.
Answer writing and exam use
1-mark use
Write the exact meaning of commercial unit in one clean line.
2-mark use
Define commercial unit and add one example or condition.
3-mark use
Explain commercial unit, show the method or example, and mention the common mistake.
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