Advanced Qualification · A-002 Advanced components and circuits · A-002-003-003
Which component conducts electricity from a negative emitter to a positive collector when its base voltage is made positive?
- AA triode vacuum tube
- BA PNP transistor
- CAn NPN transistor
- DA varactor
Correct answer: C — An NPN transistor. From the official ISED question bank, verified word for word.
Why
An NPN transistor conducts current from its emitter to its collector when a positive voltage is applied to its base, acting like a switch that turns on with a positive signal. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced components and circuits is section A-002 of the Advanced exam: Advanced components and circuits: semiconductors, amplifier classes, oscillators, mixers, filters and digital logic.
Drill A-002 — free, no account