If a voltmeter is properly connected across a closed switch in a powered circuit, what will it read?

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Enhance your understanding of the fundamentals of electricity with the AMT General Exam. Study with multiple-choice questions crafted to improve your knowledge and confidence. Prepare effectively for your success!

Multiple Choice

If a voltmeter is properly connected across a closed switch in a powered circuit, what will it read?

Explanation:
Voltage is the difference in electric potential between two points. When a switch is closed, it conducts with only a very small resistance, so the voltage drop across it is V = I R, which becomes essentially zero because R is tiny even if current is flowing. That means the two sides of the switch sit at nearly the same potential, and a voltmeter connected across them reads zero volts (zero or nearly zero in a real switch). The supply voltage appears across the rest of the circuit, not across the closed switch.

Voltage is the difference in electric potential between two points. When a switch is closed, it conducts with only a very small resistance, so the voltage drop across it is V = I R, which becomes essentially zero because R is tiny even if current is flowing. That means the two sides of the switch sit at nearly the same potential, and a voltmeter connected across them reads zero volts (zero or nearly zero in a real switch). The supply voltage appears across the rest of the circuit, not across the closed switch.

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