Elenco Electronic Component Kit - Manual (Page 21)

-20-
SEMICONDUCTORS
SELF TEST
1. The diode is best described as:
a) Switch c) Electrical Storage Device
b) Check Valve d) Electrical Momentum
2. A silicon diode begins to conduct current at
approximately:
a) 7 volts c) 0.7 lb.
b) 0.7 volts d) 7 lbs.
3. NPN transistors have:
a) 2 leads c) 2 diodes
b) 3 leads d) b & c
4. NPN and PNP transistors are used to:
a) Create Power c) Control Current
b) Change Resistance d) Control Capacitance
5. The ratio of collector current to base current in a
transistor is called:
a) Beta (
β)
c) Current Control
b) Amplification d) FET
6. A diode made of Gallium Arsenide is called:
a) Zener Diode c) LED
b) Power Diode d) Detector Diode
7. A Field Effect Transistor controls Source to Drain
current by:
a) Diode Conduction c) Base Voltage
b) Base Current d) Gate Diode
8. A Zener Diode is used as:
a) Voltage Reference c) Resistance Control
b) Current Reference d) b & c
9. An Integrated Circuit contains:
a) Diodes and Resistors c) Inductors
b) Transistors and Small d) a & b
Capacitors
10. If the arrow in the symbol for a transistor points
toward the base lead, the transistor is a:
a) NPN Transistor c) FET Transistor
b) PNP Transistor
THEORY
Circle the letter that best fits the description.
PRACTICE
Open the Semiconductor bag and answer the following questions.
EXTRA CREDIT
Connect the LED (light emitting diode) to a 9 volt battery
(not provided) as shown in Figure 33. Why is the resistor
necessary? If the LED does not light up reverse the
battery leads. Why does the LED only light when
connected a certain way?
Figure 33
How many of the devices are diodes? __________
How many of the devices look like transistors? __________
How many integrated circuits are included? __________
Was a Light Emitting Diode included? __________
How are the diodes marked to show which end current will not go into? __________
Twisted
Leads
LED
1000
Ω
Resistor
9V
Battery