Which component allows changing its resistance to adjust circuit current?

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Multiple Choice

Which component allows changing its resistance to adjust circuit current?

Explanation:
The idea is to control how much current flows by changing resistance. With a fixed voltage source, current follows I = V/R, so increasing resistance lowers current and decreasing resistance raises current. A variable resistor is designed for exactly that—it lets you adjust its resistance with a knob or slider, which in turn tunes the circuit current. Switches only open or close the circuit; they don’t adjust resistance. A battery provides voltage, not a tunable resistance. So the component that best fits the description of “changing its resistance to adjust circuit current” is the variable resistor.

The idea is to control how much current flows by changing resistance. With a fixed voltage source, current follows I = V/R, so increasing resistance lowers current and decreasing resistance raises current. A variable resistor is designed for exactly that—it lets you adjust its resistance with a knob or slider, which in turn tunes the circuit current.

Switches only open or close the circuit; they don’t adjust resistance. A battery provides voltage, not a tunable resistance. So the component that best fits the description of “changing its resistance to adjust circuit current” is the variable resistor.

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