PASCO EM-8622 BASIC ELECTRICITY - Manual (Page 31)

27
012-04367E Basic Electricity
EQUIPMENT NEEDED:
-Circuits Experiment Board -Two D-cell Batteries
-Wire Leads -Digital Multimeter (DMM)
-1000-
Ω
Resistor -2N3904 Transistor (NPN)
-100-
Ω
Resistor.
Purpose
The purpose of this lab will be to experimentally determine some of the operating characteristics
of a transistor.
Procedure
➀ Connect the circuit shown in Figure 10.1a using the 2N3904 Transistor you’ve been supplied.
Resistor R
1
= 1000
Ω
and resistor R
2
= 100
Ω
. Use Figure 10.1b as a reference along with Figure
10.1a as you record your data. Note the leads on the transistor as marked next to the socket in the
drawing.
➁ Adjust the potentiometer carefully until the reading between points A and B is approximately
0.002 volt (2.0 mv). Now read the voltage between points C and D. Record these readings in
your data table. Note that V
AB
divided by R
1
gives the current flowing to the base of the transis-
tor, while V
CD
divided by R
2
gives the current flowing in the collector part of the circuit.
➂ Adjust the potentiometer to give V
AB
the following readings, each time reading and recording the
corresponding V
CD
: 0.006, 0.010, 0.015, 0.020, 0.025, 0.030, 0.035, 0.040, 0.045, 0.050, 0.055,
0.060, 0.080, 0.100, 0.150, 0.200, 0.250 volts. Also set V
AB
to 0.000 volts.
Experiment 10: Transistors
Figure 10.1a Figure 10.1b
A B
C D
b
c
e
e
b
c
Transistor as seen from
above
Socket
2N3904
A
R
1 B
C
2N3904
D
R
2
c e
b
R
2
R
1