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Science · Grades 9–12

Electrical power

For a steady DC circuit, multiply voltage by current.

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The key idea

For a steady DC circuit, multiply voltage by current.

P = VI (steady DC)

Worked examples

A steady DC device operates at 9 V and 2 A. Find power in W.

9 × 2 = 18

18 W

A steady DC device operates at 33 V and 2 A. Find power in W.

33 × 2 = 66

66 W

Try it yourself

  1. A steady DC device operates at 26 V and 8 A. Find power in W.

  2. A steady DC device operates at 56 V and 14 A. Find power in W.

Check your understanding

Answers and marking notes
  1. 208 W

    26 × 8 = 208

  2. 784 W

    56 × 14 = 784

Further reading and review references

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Learning preview · teacher review required. Grade bands are approximate, not official curriculum alignment.