Technical data
38
arallel Circuits
urrent Flow in Parallel Circuits
roject Objective:
• To verify that the amount of current through parallel branches is inverse to the branch’s
resistance value.
• To confirm Kirchhoff’s Current Law by verifying that the total current in a parallel circuit equals
the sum of the individual branch currents.
ems Needed:
- Electronics Trainer - Digital multi-meter
- Jumper Wires - Resistors: 10k, 18k, 47k, 100k
ake sure power supply is off when connecting meters or changing circuit components.
P
C
P
It
M
Experiment
et 1. Connect the circuit as shown in Figure 16-1 and s
the applied voltage to 10 volts.
2. Find the total circuit current and the current flowing
“X” in Figure 16-1 and measuring
in series when taking current
1
_________________
3
__________.
I = . I
T
= .
ce value in
R
2
is roughly ____________________ times larger than the
ly
____________________ the current
___________________ times
R
3
roughly ____ ________
an conclude from this experiment that the current through parallel
nches’
______________ . We can also observe
d currents that the total circuit current is
_________________
3. a 100
nts one at a
3
__.
T
1 3 2
through each parallel branch by breaking the circuit
at the appropriate
with an ammeter.
Remember, the ammeter leads must be
connected
measurements!
I = ______ ___. I = _______________
__________________________ _________________________
2
The resistan
resistance in R
1
. The current through R
2
is rough
through R
1
. The resistance value in R
3
is roughly _
larger than the resistance in R
1
. The current through
the current through R
1
. We c
is ___ _ ___
branches is inversely proportional to the bra
from the measure equal to the
of the individual branch currents.
Remove
R
2
from the circuit and replace it with k resistor. Leave the applied voltage at
0 volts and measure and record the circuit curre time. 1
I
1
= __________________________. I = _______________________
= __________________________. I = _________________________. I
2
id the current through R or R change when R was increased to 100k? _____________ D
Figure 16-1
+
_
10k
47k
18k
V
A
R
1
R
2
R
3