Technical data
56
ombination Circuits
etecting an open in a Series-Parallel Circuit
roject Objective:
• To demonstrate the effects of an open occurring in both the series and parallel portions of a
combination circuit.
• To observe what happens to the total circuit current when an open occurs in a series-parallel
circuit.
ems Needed:
- Electronics Trainer - Digital multi-meter
- Jumper Wires - Resistors: 1k, 3 - 10k, 47k
C
D
P
It
Make sure power supply is off when connecting meters or changing circuit compon
Experiment
ents.
1. Connect the circuit as shown in Figure 25-1.
2. Apply the correct amount of voltage to obtain
them below.
.
_____________________.
______________
_____________________
.
V = _________________________
.
I
3
= __________________________.
= . I
4
= __________________________.
= . I
5
= __________________________.
h
___________________ This is
e
________ with the main line.
h
___________________ This is because
e with the main line components.
R mulate an “open” in the main line of the circuit.
s.
mA
R
1
R
2
10k
R
3
10k
10k
1.2mA of total circuit current. Measure the circuit
voltages and record
V
A
= _________________________
V
1
= ____
___V
2
= _____ ___.
V
3
= _________________________.
V
4
= ____
5
.
3. Measure the current through each component
I
T
= __________________________.
I
1
__________________________
I
2
__________________________
W ich resistances in this circuit does I
T
flow through?
b cause these resistances are in ___________
W at resistances have the same voltage drop?
th se resistances are in ___________________
4. Remove resistor
5
from the circuit. This will si
Measure and record the following circuit voltage
V
A
= _________________________. V
3
= _________________________.
V
1
= _________________________. V
4
= _________________________.
V
A
−
1k
Figure 25-1
+
R
5
R
4
47k