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Maintenance Technician: Math Ohm's Law Flashcards

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  1. Using Ohm's Law, if voltage is 120V and resistance is 40Ω, what is the current?

    Answer: 3A

    I = V ÷ R = 120 ÷ 40 = 3 amperes.

  2. A circuit has a current of 5A and resistance of 24Ω. What is the voltage?

    Answer: 120V

    V = I × R = 5 × 24 = 120 volts.

  3. The voltage across a resistor is 60V and the current through it is 2A. What is the resistance?

    Answer: 30Ω

    R = V ÷ I = 60 ÷ 2 = 30 ohms.

  4. Three resistors of 10Ω, 20Ω, and 30Ω are connected in series. What is the total resistance?

    Answer: 60Ω

    Series resistance: R_total = R1 + R2 + R3 = 10 + 20 + 30 = 60Ω.

  5. A motor draws 15A from a 240V supply. What is the power consumed?

    Answer: 3,600W

    P = V × I = 240 × 15 = 3,600 watts.

  6. A resistor has a rated power of 10W and a resistance of 40Ω. What is the maximum safe voltage across it?

    Answer: 20V

    P = V²/R → V² = P × R = 10 × 40 = 400 → V = √400 = 20V.