Which instrument measures voltage in a circuit?

Which instrument measures voltage in a circuit?

• A. Ammeter
• B. Voltmeter
• C. Ohmmeter
• D. Barometer

Answer: (B)

Voltage is the electrical pressure between two points in a circuit. To read that pressure, you use a voltmeter, which is connected across the points you want to measure (in parallel). This setup lets the meter assess the potential difference without drawing much current from the circuit, thanks to its high internal resistance. Ammeters measure current and are placed in series so they can observe the flow of electrons through the circuit. Ohmmeters measure resistance and are used when circuits are de-energized to find how much resistance a component offers. Barometers measure atmospheric pressure, not electrical signals, so they aren’t used for circuit voltage. So, the instrument that measures voltage is the voltmeter.

Voltage is the electrical pressure between two points in a circuit. To read that pressure, you use a voltmeter, which is connected across the points you want to measure (in parallel). This setup lets the meter assess the potential difference without drawing much current from the circuit, thanks to its high internal resistance.

Ammeters measure current and are placed in series so they can observe the flow of electrons through the circuit. Ohmmeters measure resistance and are used when circuits are de-energized to find how much resistance a component offers. Barometers measure atmospheric pressure, not electrical signals, so they aren’t used for circuit voltage.

So, the instrument that measures voltage is the voltmeter.