Name instruments used to measure electrical resistance, current, and voltage.

Name instruments used to measure electrical resistance, current, and voltage.

• A. Ohmmeter, Ammeter, Voltmeter.
• B. Thermometer, Barometer, Hygrometer.
• C. Altimeter, VSI, Attitude indicator.
• D. Ammeter, Voltmeter, Tachometer.

Answer: (A)

To measure resistance, current, and voltage, you need three meters each suited to one quantity. An ohmmeter measures resistance by passing a small current through the unknown resistor and reading the result. An ammeter is placed in series with the circuit so the same current flows through it and can be read directly. A voltmeter is connected in parallel across a component to sense the potential difference without significantly altering the circuit. Together, these three instruments cover the three fundamental electrical quantities: resistance, current, and voltage. The other options bring in devices for temperature, pressure, humidity, or aviation instruments, or swap in a tachometer that doesn’t measure electrical resistance or voltage.

To measure resistance, current, and voltage, you need three meters each suited to one quantity. An ohmmeter measures resistance by passing a small current through the unknown resistor and reading the result. An ammeter is placed in series with the circuit so the same current flows through it and can be read directly. A voltmeter is connected in parallel across a component to sense the potential difference without significantly altering the circuit. Together, these three instruments cover the three fundamental electrical quantities: resistance, current, and voltage. The other options bring in devices for temperature, pressure, humidity, or aviation instruments, or swap in a tachometer that doesn’t measure electrical resistance or voltage.