What is the SI unit of power, equal to one joule per second?

The watt.

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  1. The volt
  2. The watt ✔
  3. The ampere

Why: Power is energy per unit of time. One watt equals one joule of energy used each second.

Huh, didn't know that: Power is energy per unit of time. One watt equals one joule of energy used each second.

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References

Answer: The watt. Power is energy per unit of time. One watt equals one joule of energy used each second.

  1. Energy en.wikipedia.org/wiki/Energy
    The SI unit of power, defined as energy per unit of time, is the watt, which is one joule per second.
    Checked 2026-11-07.

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