Technical data

48
ombination Circuits
esistance in Series-Parallel Circuits
roject Objective:
To verify series and parallel resistance rules as they apply to series-parallel combination circuits.
ems Needed:
- Electronics Trainer - Digital multi-meter
- Jumper Wires - Resistors: 1k, 4 - 10k
ake sure power supply is off when connecting meters or changing circuit components.
xperiment
C
R
P
It
M
E
1. Connect the circuit as shown in Figure 21-1.
ltage to obtain a total circuit current
______________________.
_________________
______________________.
__ V and the total circuit current is
_________ mA, then according to Ohm’s Law the total resistance must be
he result in step 1?
__________________
_____________
___________________
________________
4. er from the circuit and measure the total
sist
T
.
cuits, the total resistance equals the sum of all
arallel
2. Calculate the total circuit resistance from the resistor
values given.
R
T
= __________________________.
3. Apply enough vo
of 1.2mA. Measure and record the following voltages.
V
A
= ____
V
1
= _____ ____.
V
2
= __________________________.
V
3
= ____
V
4
= __________________________.
Since the applied voltage is _________________
__________
___________________ . Is this close to t
Which resistors in this circuit are in parallel? ________
Is the voltage the same across these resistors?
Which resistors are in series and carry I
T
? ___
Disconnect the power supply and the ammet
ance with an ohmmeter. re
R = __________________________
conclusion, in series-parallel combination cirIn
he components in ________________________ plus the equivalent resistance of pt
omponents whose combined resistance is effectively in ________________________c
ith the components in the main line. w
mA
R
1
1k
R
2
R
3
R
4
10k
10k
10k
Figure 21-1
+
V
A
