Electrical Power Systems

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What is the unit of measurement for true power?

V (volts)

A (amperes)

VA (volt-amperes)

W (watts) (correct)

Why is it important to strip a wire to the correct size?

To reduce the risk of overheating (correct)

To increase the voltage in the circuit

To decrease the reactance in the circuit

To increase the current flow

What is the purpose of grounding in electrical systems?

To increase the voltage in the circuit

To decrease the current flow

To increase the reactance in the circuit

To reduce the risk of electrical shock (correct)

What is unintentional voltage drop also known as?

Voltage drop Signup and view all the answers

What is the conversion rate for kilowatts (kW) to watts (W)?

1 kW = 1000 W Signup and view all the answers

What is the maximum distance allowed between the HVACR equipment and the disconnect box according to Section 440.14 of NEC?

50 feet Signup and view all the answers

What is the primary cause of fire and melting of insulation in wiring systems?

Excess heat Signup and view all the answers

What is the unit of measurement for capacitive reactance?

Farads Signup and view all the answers

What is the primary function of a Ground Fault Circuit Interrupter (GFCI)?

To detect and interrupt ground faults Signup and view all the answers

What is the relationship between the American Wire Gauge (AWG) number and the diameter of a wire?

The diameter increases as the AWG number decreases Signup and view all the answers

What is the purpose of a thermistor in a wiring system?

To detect changes in temperature Signup and view all the answers

What is the term for when a circuit has more than one AC?

Polyphase circuit Signup and view all the answers

What is the primary function of a circuit breaker?

To disconnect the circuit when current exceeds a predetermined level Signup and view all the answers

What occurs when a person touches a live circuit and becomes a conductor?

Electrical shock Signup and view all the answers

What is the purpose of a fuse in a circuit?

To disconnect the circuit when current exceeds a predetermined level Signup and view all the answers

What is the term for a circuit that is powered by a source no greater than 30V and 1000V?

Class 2 circuit Signup and view all the answers

What electrical property opposes changes in current?

Inductance Signup and view all the answers

What is the formula for electrical power?

P = I(current) x E(emf or volts) Signup and view all the answers

What is the purpose of bonding in electrical systems?

To join metallic components together Signup and view all the answers

What is the color of the wire used for grounding?

Green Signup and view all the answers

What is the difference between power input and output called?

Power loss Signup and view all the answers

What is the purpose of circuit protection devices?

To divert current from a fault Signup and view all the answers

What is the type of voltage that is typically used in residential homes?

120VAC/1/60Hz Signup and view all the answers