Electrical Current and Circuit Quiz

What is the unit of electrical current?

• Volt

• Ampere

• Ohm

• Watt

Which device is used to measure electrical voltage?

• Ammeter

• Voltmeter

• Ohmmeter

• Multimeter

In an AC circuit, what is the term for the number of cycles per second?

• Amperage

• Wattage

• Frequency

• Resistance

What is Ohm’s Law?

• Voltage = Resistance × Current

• Power = Voltage × Current

• Resistance = Voltage ÷ Current

• Current = Voltage ÷ Resistance

What is the unit of electrical resistance?

• Ampere

• Volt

• Ohm

• Watt

Which type of current flows in one direction only?

• Alternating Current (AC)

• Direct Current (DC)

• Pulsating Current

• Static Current

Which of the following components controls the flow of current in a circuit?

• Capacitor

• Resistor

• Transformer

• Relay

What is the purpose of a capacitor in an HVAC system?

• To regulate current

• To store electrical energy

• To increase resistance

• To measure voltage

The primary function of a circuit breaker is to:

• Control the fan speed

• Prevent overheating

• Protect the circuit from overcurrent

• Measure electrical load

What does a transformer do in an HVAC system?

• Regulates temperature

• Converts voltage from high to low or vice versa

• Stores electrical energy

• Measures current flow