A tester for detecting electric current utilizes some effect of electric current to detect its presence. Which of the following components can be used for this?

All of these can be used to detect current. A light bulb and an LED will glow if current passes through it, and a magnetic compass needle will show a deflection if current flows through a wire in its proximity.

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A tester for detecting electric current utilizes some effect of electric current to detect its presence. Which of the following components can be used for this?

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