Basic Qualification · B-004 Circuit components · B-004-003-001
Which of these components can amplify a small signal using low voltages?
- A Silicon-controlled rectifier
- B Bipolar transistor
- C Variable resistor
- D Thyristor
Correct answer: B — Bipolar transistor. From the official ISED question bank, verified word for word.
Why
A Bipolar transistor acts like a valve that uses a tiny electrical signal to control a much larger flow of power, allowing it to make weak signals stronger even when powered by low voltages. The full explanation — and one for every question — is in Pro.
Practise this section
The parts inside the box: resistors, capacitors, inductors, diodes, transistors, tubes and what each does in a circuit.