Ontario Grade 9 Science Class Practice Exam

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What is electrical resistance measured in?

Volts
Watts
Ohms
Amperes

The correct answer is: Ohms

Electrical resistance, symbol R, is defined as the ratio of voltage to current for a given material or component. It is measured in units of Ohms (Ω), as represented by option C. Option A, volts, is the unit for measuring electrical potential difference or voltage. Option B, watts, is the unit for measuring power. Option D, amperes, is the unit for measuring electric current. None of these units are used to measure electrical resistance. Therefore, the correct answer is C Ohms.