alleryA 2 ohm heater element draws 5 A. What potential difference is across it?
A2.5 V
B7 V
C3 V
D10 V
Answer & Solution
Correct answer: D. 10 V
1. Use V = I x R.
2. V = 5 x 2 = 10 V; 2.5 V comes from dividing and 7 V or 3 V from adding or subtracting.
3. So the potential difference is 10 V.
_Source: Wikipedia, Electric current, Ohm's law_
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