Electrical Power Systems
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Questions and Answers

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?

    <p>Voltage drop</p> Signup and view all the answers

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

    <p>1 kW = 1000 W</p> 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?

    <p>50 feet</p> Signup and view all the answers

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

    <p>Excess heat</p> Signup and view all the answers

    What is the unit of measurement for capacitive reactance?

    <p>Farads</p> Signup and view all the answers

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

    <p>To detect and interrupt ground faults</p> Signup and view all the answers

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

    <p>The diameter increases as the AWG number decreases</p> Signup and view all the answers

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

    <p>To detect changes in temperature</p> Signup and view all the answers

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

    <p>Polyphase circuit</p> Signup and view all the answers

    What is the primary function of a circuit breaker?

    <p>To disconnect the circuit when current exceeds a predetermined level</p> Signup and view all the answers

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

    <p>Electrical shock</p> Signup and view all the answers

    What is the purpose of a fuse in a circuit?

    <p>To disconnect the circuit when current exceeds a predetermined level</p> 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?

    <p>Class 2 circuit</p> Signup and view all the answers

    What electrical property opposes changes in current?

    <p>Inductance</p> Signup and view all the answers

    What is the formula for electrical power?

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

    What is the purpose of bonding in electrical systems?

    <p>To join metallic components together</p> Signup and view all the answers

    What is the color of the wire used for grounding?

    <p>Green</p> Signup and view all the answers

    What is the difference between power input and output called?

    <p>Power loss</p> Signup and view all the answers

    What is the purpose of circuit protection devices?

    <p>To divert current from a fault</p> Signup and view all the answers

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

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

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