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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. What is the formula for calculating electrical power?

    Answer: P = V × I

    Power (P) in watts equals voltage (V) multiplied by current (I), expressed as P = V × I.

  2. A circuit has a voltage of 120V and a resistance of 20 ohms. What is the current?

    Answer: 6 amps

    Using Ohm's Law, I = V/R = 120/20 = 6 amps.

  3. In a series circuit, how does total resistance compare to individual resistors?

    Answer: Total resistance is the sum of all resistors

    In a series circuit, total resistance equals the sum of all individual resistances (RT = R1 + R2 + R3...).

  4. What unit is used to measure electrical resistance?

    Answer: Ohm

    Electrical resistance is measured in ohms (Ω), named after physicist Georg Simon Ohm.

  5. What is the power factor of a purely resistive circuit?

    Answer: 1.0

    A purely resistive circuit has a power factor of 1.0 because voltage and current are perfectly in phase.

  6. A 240V, 5kW electric heater draws how many amps?

    Answer: 20.8 amps

    Using I = P/V = 5000/240 ≈ 20.8 amps.