Key Stage 3 (KS3) Physics Practice Test 2025 – The Complete All-in-One Guide to Exam Success!

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What is the unit of measurement for power in the International System of Units (SI)?

Joule (J)

Newton (N)

Watt (W)

The unit of measurement for power in the International System of Units (SI) is the Watt (W). Power is defined as the rate at which energy is transferred or converted. One Watt is equal to one Joule per second, which means that when an electrical device uses one Watt of power, it consumes one Joule of energy every second.

This relationship highlights that the Watt is a direct measure of how quickly energy is being used, making it the appropriate unit for quantifying power. The other units mentioned—Joule, Newton, and Pascal—represent different physical quantities: Joules measure energy, Newtons measure force, and Pascals measure pressure. Thus, they are not suitable units for power measurement.

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Pascal (Pa)

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