Discussion
If a 50 Ω resistor carries a current of 20 mA, the voltage drop across the resistor will be ______.
Answer: B
The voltage drop is 1.0 V. By Ohm's law the voltage across a resistor is the product of the current and the resistance, with the current of 20 mA written as 0.02 A.
\[ V = IR = 0.02 \times 50 = 1.0\ \text{V} \]
The value 0.1 V would come from 2 mA, 10 V from 200 mA, and 100 V from 2 A, so those options correspond to wrong currents. The second option is the answer.
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