alleryIf the voltage across a fixed resistor is doubled, what happens to the current?
AIt is halved
BIt is doubled
CIt is unchanged
DIt drops to zero
Answer & Solution
Correct answer: B. It is doubled
1. Current is directly proportional to potential difference at fixed resistance.
2. Doubling V doubles I, so halving, no change and zero are all wrong.
3. So the current doubles.
_Source: Wikipedia, Electric current, Ohm's law_
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