The Transistor (Leaving Cert Physics): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What type of semiconductor material is the base in an npn transistor?
What type of semiconductor material is the base in an npn transistor?
p-type semiconductor
Which region of the npn transistor is described as the control terminal?
Which region of the npn transistor is described as the control terminal?
Base
What is the relationship between the three currents in a transistor?
What is the relationship between the three currents in a transistor?
What is the key principle of transistor action?
What is the key principle of transistor action?
Small base current controls larger collector current
What voltage is needed across the base-emitter junction to turn on the transistor?
What voltage is needed across the base-emitter junction to turn on the transistor?
About 0.6 volts
By what factor is collector current typically larger than base current?
By what factor is collector current typically larger than base current?
10 to 1000 times
What happens to collector current when base current is zero?
What happens to collector current when base current is zero?
No collector current flows
Below what base voltage do both base and collector currents become zero?
Below what base voltage do both base and collector currents become zero?
About 0.4V
How does a thermistor's resistance change as temperature increases?
How does a thermistor's resistance change as temperature increases?
Resistance decreases
In a temperature-controlled switch, what does the bulb lighting indicate?
In a temperature-controlled switch, what does the bulb lighting indicate?
Temperature has risen
In configuration A with an LDR, when does the bulb come on?
In configuration A with an LDR, when does the bulb come on?
In darkness
What applications use light-controlled switches with transistors?
What applications use light-controlled switches with transistors?
Street lights and security lights