DigE: Ch04 Basic Instruments and Measurements

Front

What is the purpose of multiplier resistors in a voltmeter circuit?

Back

Multiplier resistors are added to extend the range of a voltmeter, allowing it to measure higher voltages without damage.

Front

What does a red plus (+) sign indicate on a meter?

Back

A red plus (+) sign indicates positive polarity.

Front

What instrument is used to measure electrical pressure in a circuit?

Back

A voltmeter is used to measure electrical pressure (voltage) in a circuit.

Front

What does a black line (–) represent on a meter?

Back

A black line (–) represents negative polarity.

Front

True or False: An ammeter can be damaged if connected directly across the source voltage.

Back

True. An ammeter can be damaged if connected directly across the source voltage because it is designed to measure current, not voltage.

Front

What is the function of a wattmeter?

Back

A wattmeter measures the electrical power (in watts) in a circuit.

Front

What is the role of an ohmmeter?

Back

An ohmmeter is used to measure the resistance in a circuit.

Front

Define 'polarity' in the context of electrical measurements.

Back

Polarity refers to the direction of the electric current or the positive and negative terminals in a circuit.

Front

What is the significance of using shunt resistors in a circuit?

Back

Shunt resistors are used to extend the range of an ammeter by allowing it to measure larger currents without damage.

Front

How does a voltmeter differ from an ammeter?

Back

A voltmeter measures voltage (electrical pressure) across two points, while an ammeter measures the current flowing through a circuit.