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Electrical Theory and Math Flashcards

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

Read the first 6 Electrical Theory and Math flashcards as text

  1. A transformer has a primary voltage of 480V and a turns ratio of 4:1. What is the secondary voltage?

    Answer: 120V

    Secondary voltage = Primary voltage / turns ratio = 480 / 4 = 120V.

  2. What is the formula for calculating the area of a circle (used for conduit fill calculations)?

    Answer: A = πr²

    The area of a circle is π times the radius squared (A = πr²), which is essential for conduit fill calculations.

  3. If a circuit has apparent power of 5 kVA and true power of 4 kW, what is the power factor?

    Answer: 0.8

    Power factor = True power / Apparent power = 4 kW / 5 kVA = 0.8.

  4. What does Kirchhoff's Current Law (KCL) state?

    Answer: The sum of all currents entering a node equals the sum leaving it

    KCL states that the algebraic sum of all currents entering and exiting a node must equal zero.

  5. What is the reactance of a capacitor called?

    Answer: Capacitive reactance

    The opposition a capacitor provides to AC current is called capacitive reactance (Xc), measured in ohms.

  6. Two resistors of 6 ohms each are connected in parallel. What is the total resistance?

    Answer: 3 ohms

    For two equal resistors in parallel, RT = R/2 = 6/2 = 3 ohms.