Advanced Qualification · A-003 Measurements · A-003-006-001

A meter has a full-scale deflection of 40 microamperes and an internal resistance of 96 ohms. You want it to read 0 to 1 mA. The value of the shunt to be used is:

1. A 24 ohms
2. B 16 ohms
3. C 40 ohms
4. D 4 ohms

Correct answer: D — 4 ohms. From the official ISED question bank, verified word for word.

Why

To make the meter read up to 1 mA, most of that current must bypass the delicate coil through a parallel resistor called a shunt. The full explanation — and one for every question — is in Pro.

Practise this section

Measurements: meters, oscilloscopes, counters, signal generators, and what a reading actually tells you.

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