Basic Qualification · B-005 Basic electronics and theory · B-005-002-009
What is a voltage drop?
- A The voltage output of a step-down transformer
- B The loss of voltage caused by the flow of current through a circuit
- C Any point in a circuit that has zero voltage
- D The difference in voltage at the output terminals of a transformer
Correct answer: B — The loss of voltage caused by the flow of current through a circuit. From the official ISED question bank, verified word for word.
Why
Voltage drop happens because real wires and components resist the flow of electricity, turning some electrical energy into heat as current moves through them. 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.