Select all the active electronic components in the following parts list:
A. Resistor
B. Capacitor
C. Triac
D. IC555
E. LM7912
F. Operational amplifier
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2 types of BPJ transistors are
A. PN
B. PNP
C. NPN
D. PNN
E. Base
F. Emitter
A transistor has the following terminals
A. Emitter
B. Collector
C. Base
D. Gate
E. Anode
F. Cathond
A transistor can be mainly used for a/an
A. Rectifier
B. Amplifier
C. Switch
D. Filter
E. LED
2 common types of power supply units (PSU) are__________ and switched-mode.