Red Seal Electrician Practice
Meters and troubleshootingQuestion 736 of 1506

Why does a 4-20 mA current loop have no error from wire resistance?

  1. The wire resistance is always zero
  2. The loop uses AC
  3. The supply voltage is always kept at a fixed 120 V
  4. It is a series circuit, so the current is the same everywhere
Show answer

Correct answer: It is a series circuit, so the current is the same everywhere

Current in a series loop is equal at the transmitter and at the indicator.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 9.3: Current Signal Systems

Practice meters and troubleshooting

Questions last reviewed: 18 October 2026