Analog and electronic circuits

When a current of 1 mA flows through a 10 kΩ resistor, what is the voltage across it?

  1. A10 V
  2. B100 V
  3. C0.1 V
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Answer: A. 10 V

By Ohm's law V = I × R, 1 mA × 10 kΩ = 0.001 A × 10,000 Ω = 10 V. A handy rule is that multiplying mA by kΩ gives volts directly.

  • A. Correct. 1 mA × 10 kΩ = 10 V.
  • B. 100 V is ten times too large.
  • C. 0.1 V is 100 times too small, a unit conversion error.
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