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Electronics A/S WJEC > Chapter 5 : Semiconductor Components > Flashcards

Chapter 5 : Semiconductor Components Flashcards

1
Q

Name the 3 different types of diodes

A

Silicon diode
Zener diode
LED

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2
Q

Draw the symbol for a silicon diode?

A

Triangle with a line at the top

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3
Q

Draw the symbol for a zener diode

A

Silicon diode but the line is longer

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4
Q

Draw the symbol for a LED

A

Silicon diode, with two arrows coming from it

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5
Q

How much is the voltage drop across a silicon diode during forward bias?

A

0.7V

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6
Q

For a silicon diode, what is the reverse bias current?

A

0A

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7
Q

What are the applications for a silicon diode?

A

1.Protection against back emf
2. Protection against reverse polarity
3. Rectification of AC

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8
Q

What is ‘back emf’?

A

When the current flowing through an inductor is switched off, it generates a high voltage in the opposite direction.

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9
Q

How can back emf be stopped on a MOSFET or transistor circuit?

A

Diode in parallel with the load

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10
Q

When does a zener diode begin to conduct?

A

When the reverse voltage across it rises too far

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11
Q

What is the forward bias voltage of a zener diode?

A

0.7V

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12
Q

Reverse bias zener diode voltages are specific values. List 3.

A

3.3V 5.1V 5.6V

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13
Q

The transistor has 3 terminals, what are they?

A

Collector (top)
Base (middle)
Emitter (bottom)

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14
Q

What is the voltage drop across a transistor?

A

0.7V

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15
Q

State the equation associated with transistor gain?

A

Ic=hfe x Ib

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16
Q

What are the units for transistor gain?

A

no units

17
Q

What voltage does a transistor saturate?

A

0V

18
Q

Whenever a load is connected to a voltage divider circuit, does the output voltage increase or decrease?

A

The output voltage will drop

19
Q

What are the 3 things that need to be calculated in order to create Thevenin’s equivalent circuit

A

The open circuit voltage
The short circuit current
Resistance equivalent

20
Q

How do you calculate open circuit voltage?

A

Potential divider equation

21
Q

How do you calculate short circuit current

A

Vs/R1

22
Q

How do you calculate equivalent resistance for thevenin

A

Voc/Isc

23
Q

What is the rule of thumb for current regarding voltage divider circuit?

A

The current drawn by the load should be at least ten times smaller than the current flowing through the voltage divider?

24
Q

What is the input current of a MOSFET?

A

0A

25
Q

The MOSFET will be off, when the gate voltage is…?

A

Zero

26
Q

What are the three terminals in a MOSFET?

A

Drain (top)
Gate (middle)
Source (bottom)

27
Q

What is the equation used to calculate drain current?

A

Id=gm(Vgs-3)
gm=transconductance

28
Q

What are the units for transconductance (gm)

A

Siemens (S)

29
Q

What input voltage is required to turn a MOSFEt on?

A

3V

30
Q

’

A

Electronics A/S WJEC (7 decks)

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