International General Certificate of Secondary Education (IGCSE) Physics Practice Exam

Question: 1 / 400

What is the primary effect of resistance on an electric current?

It increases the flow of current

It decreases the flow of current

Resistance in an electrical circuit is a measure of how much a material opposes the flow of electric current. According to Ohm's law, which is stated as V = IR (where V is voltage, I is current, and R is resistance), an increase in resistance will result in a decrease in current if the voltage remains constant. This relationship explains why the correct answer is that resistance decreases the flow of current.

When resistance is present, it effectively impedes the movement of charge carriers (such as electrons), thus reducing the overall amount of current that can flow through the circuit for a given voltage. This understanding is fundamental in various electrical applications, such as designing circuits where specific current levels are required. In contrast, other effects mentioned do not accurately reflect the nature of resistance in a circuit.

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It has no effect on current

It reverses the direction of current

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