Ohm’s law: current, voltage and resistance

Use V = IR with matching units.

Understand the idea

For an ohmic resistor under suitable constant physical conditions, voltage equals current times resistance. Rearrange the relation for the unknown.

See a worked example

With V = 12 V and R = 4 Ω, I = V/R = 12/4 = 3 A.

A useful check

Divide voltage by resistance to find current; do not multiply them.

Try a fresh practice set

Five questions with feedback on every answer. New sets can repeat familiar ideas so you can practise again. This is practice, not a certified assessment.

Number range / challenge

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