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Electrical Systems and Lighting Flashcards

7 cards from real BOC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Electrical Systems and Lighting flashcards as text

  1. A 120-volt circuit feeds a resistive heater with a resistance of 10 ohms. How much current does it draw?

    Answer: 12 A

    By Ohm's law, I = V/R = 120 V / 10 Ω = 12 A.

  2. Power factor in a building's electrical system is best defined as the ratio of:

    Answer: Real power (kW) to apparent power (kVA)

    Power factor equals kW divided by kVA and shows how effectively current is converted into useful work.

  3. Commercial utility demand charges are typically based on which measurement?

    Answer: The highest average kW over a short interval (often 15 minutes) during the billing period

    Demand charges bill the peak average kW recorded over a short demand interval, regardless of total energy use.

  4. One footcandle of illuminance is equal to:

    Answer: One lumen per square foot

    A footcandle is the illuminance produced by one lumen evenly spread over one square foot.

  5. A Class A GFCI receptacle is designed to trip when it senses a ground-fault current imbalance of about:

    Answer: 5 mA

    Class A GFCIs trip at roughly 4–6 mA to protect people from shock.

  6. A lamp rated at a correlated color temperature of 2700 K will appear:

    Answer: Warm, with a yellowish-white tone

    Lower Kelvin values such as 2700 K produce warm light similar to incandescent lamps.

  7. Under OSHA lockout/tagout rules, who is normally allowed to remove a personal lockout device?

    Answer: The employee who applied it

    Each lock must be removed by the worker who installed it, except under strict documented emergency removal procedures.