Electrical Power and Energy

Electrical Power and Energy Quiz

Spec 4.2.4 · AQA GCSE Physics: Quiz

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5 questions, one answer each

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  1. 1. Which equation correctly calculates electrical power?

    • A. P = V/I
    • B. P = I²R
    • C. P = mgh
    • D. P = mcΔθ

  2. 2. E = Pt calculates:

    • A. Charge
    • B. Energy transferred
    • C. Resistance
    • D. Current

  3. 3. A step-up transformer in the National Grid:

    • A. Increases voltage and decreases current
    • B. Decreases voltage and increases current
    • C. Increases both voltage and current
    • D. Has no effect on voltage or current

  4. 4. Calculate the power of a component with V = 12 V and I = 0.5 A.

    • A. 6 W
    • B. 12.5 W
    • C. 24 W
    • D. 6.5 W

  5. 5. Why does raising the transmission voltage reduce energy losses in the National Grid?

    • A. It increases the resistance of the cables
    • B. It reduces the current, and power loss depends on current squared
    • C. It reduces the length of the cables needed
    • D. It converts AC to DC, which loses less energy

Quiz