Grade 9 Electricity Practice Exam

What term describes the ability of a material to oppose the flow of electric current?

Electrical Resistance (R) Ohm's Law Resistor Electric Cell

Correct Answer:

Electrical Resistance (R)

Explanation:

Electrical resistance describes how much a material opposes the flow of electric current. It depends on the material itself, its temperature, and its dimensions; a higher resistance means less current for a given voltage. In Ohm’s Law, voltage equals current times resistance (V = IR), so resistance is the constant of proportionality between how hard it is for charges to move and how much current flows. A resistor is a component designed to provide a specific resistance, but the concept being described is the material’s opposition to current. An electric cell provides energy (voltage), not resistance.

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