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When a 12 V battery is connected across an unknown resistor and a current of 2.5 mA flows, the resistance is:

Question
When a 12 V battery is connected across an unknown resistor and a current of 2.5 mA flows, the resistance is:
0.208 ohm
4.8 ohm
3000 ohm
4800 ohm
Answer
4800 ohm
Detailed Explanation
R = V/I = 12 V / (2.5 x 10^-3 A) = 4800 ohm.
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