Basic Qualification · B-005 Basic electronics and theory · B-005-013-005
When measuring the voltage across a circuit component, what does the voltmeter appear to be in the circuit?
- A A high value resistance
- B A low value resistance
- C An open circuit
- D A perfect conductor
Correct answer: A — A high value resistance. From the official ISED question bank, verified word for word.
Why
A voltmeter must show the voltage across a component without changing how the circuit works, so it acts like a very large resistor that barely lets any current flow through it. The full explanation — and one for every question — is in Pro.
Practise this section
The theory: Ohm's law, power, series and parallel circuits, AC and DC, frequency and wavelength, decibels, and the metric prefixes the exam leans on.