Technical data

40
arallel Circuits
oltage in Parallel Circuits
roject Objective:
• To verify that branch voltages are equal in a parallel circuit.
• To verify that each branch voltage equals the applied voltage in parallel circuits.
ems Needed:
- Electronics Trainer - Digital multi-meter
- Jumper Wires - Resistors: 3 - 10k, 100k, 220k
ake sure power supply is off when connecting meters or changing circuit components.
xperiment
P
V
P
It
M
E
1. Connect the circuit as shown in Figure 17-1.
2. Apply 12 volts to the circuit and measure and record
all of the branch voltages.
V = _______________________
A
___.
V
1
= __________________________.
V = __________________________.
2
_____________
m the above ________
________________________________________________________________
__________________________________________________
_________________________________
__ ________________________
3. Keep the applied voltage at 12 volts and measure
ge and rec d the results below.
A
V
2
= ________________________.
1
V
3
= ________________________.
step 2?
___________________________
V
3
= _________ ____.
What two facts can we conclude fro measurements? ____________
______________
_______________________________
____________________________________
__
Change the value of R
3
from 10k to 100k.
ll of the branch voltages and the source voltaa or
V = _________________________.
= _________________________. V
id all of the voltages measure the same as inD
his indicates that if the resistance value of a branch in a parallel circuit is changed, it will not T
affect the branch voltages. These branch “voltages” are not separate voltages but are in fact
the same voltage.
Does the total circuit current change if one branch resistance changes? ________________
Does the current change through the unchanged resistance branches? ________________
oes the current change through the changed resistance branch?____________________ D
10k
+
R
1
V
A

10k
R
2
10k
R
3
Figure 17-1