Red Seal Electrician Practice
Electrical mathQuestion 594 of 1506

A person's hand-to-hand resistance is 17 kΩ when the hands are wet. What voltage drives 20 mA through the body?

  1. 34 V
  2. 3 400 V
  3. 340 V
  4. 0.34 V
Show answer

Correct answer: 340 V

E = I x R = 0.020 A x 17 000 Ω = 340 V.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 3.4: Ohm’s Law (again)

Practice electrical math

Questions last reviewed: 18 October 2026