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Science · Grades 8–12

Ohm’s law

Applies to an ohmic component under constant physical conditions.

Make a worksheet

The key idea

Applies to an ohmic component under constant physical conditions.

V = IR

Worked examples

An ideal ohmic resistor of 42 Ω carries 6 A. Find the voltage across it in V.

6 × 42 = 252

252 V

An ideal ohmic resistor of 65 Ω carries 9 A. Find the voltage across it in V.

9 × 65 = 585

585 V

Try it yourself

  1. An ideal ohmic resistor of 20 Ω carries 6 A. Find the voltage across it in V.

  2. An ideal ohmic resistor of 53 Ω carries 1 A. Find the voltage across it in V.

Check your understanding

Answers and marking notes
  1. 120 V

    6 × 20 = 120

  2. 53 V

    1 × 53 = 53

Further reading and review references

These are reference links, not copied exercises, institutional endorsement or proof of independent review.

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