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SESK: Stuff Everyone Should Know · sesk.info/elec-power-p-iv

Electric power in watts equals current in amps multiplied by what?

P = I x V, power equals current times voltage.

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  1. Voltage in volts ✔
  2. Resistance in ohms
  3. Time in seconds

Why: Watts measure how fast energy is used. A circuit pushing more current at the same voltage, or the same current at higher voltage, uses more power.

Huh, didn't know that: The unit of energy on your electric bill is the kilowatt-hour, which is power multiplied by time.

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What does one electrician say to another when they run into each other out in public? Watt's up!!
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References

Answer: Voltage in volts. Watts measure how fast energy is used. A circuit pushing more current at the same voltage, or the same current at higher voltage, uses more power.

  1. OpenStax University Physics Vol. 2, 9.5 Electrical Energy and Power openstax.org/books/university-physics-volume-2/pages/9-5-electrical-energy-and-power
    The power dissipated by the resistor is therefore P = IV
    Checked 2026-10-10.

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Trades & ShopOne ohm of resistance is defined as one volt for every what?Trades & ShopIn Ohm's law, current through a resistor is directly proportional to what?Trades & ShopIn a series circuit, which quantity is the same through every resistor?

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