Grade 11 · Science
Relate voltage, current and resistance
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Example & extra help
Try a sample
An ideal resistor has 20 V across 5 Ω. What current flows?
- 2 A
- 4 A
- 3 A
- 1 A
See the answer & why
4 A
I = 20 ÷ 5 = 4 A.
A little hint: For the stated ohmic model, voltage equals current multiplied by resistance: V = IR.
For the stated ohmic model, voltage equals current multiplied by resistance: V = IR.
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