Technical data

29
er
Voltage in Series Circuits
Projec
•
Items
- El
- Ju - Resi , 18
ake sure power supply is off when connecting meters or changing circuit components.
S ies Circuits
t Objective:
To use measurements and calculations to demonstrate the proportional relationship of
resistance and voltage in a series circuit.
Needed:
ctronics Trainer - Digital multi-meter e
mper Wires stors: 1k, 4.7k k
M
Experiment
. 1. Connect the initial circuit as shown in Figure 11-1
2. Apply 12.5 volts to the circuit and fill in the following table.
V
A
=
V
1
=
V
2
=
V
3
=
I =
T
3. Since the current is the same through all the resistors, the
p across each resistor is directly related to its
__________________________.
.
Ki f’s he sum of voltage drops around a closed loop circuit must
equal the applied voltage (V
A
). Does it? __________________.
5. Calculate the percentage of the applied voltage that is dropped by each of the resistors. Use
the following example for V
1
then solve for V
2
& V
3
. Percentage = x 100
V
1
________ % of V
A
2 A 3
_________ % of V
6. Predict what value V would be if V were increased to 22 volts.
_________
voltage dro
4. Add the individual voltage drops and record the sum
V
1
+ V
2
+ V
3
= __________________________.
rchhof Voltage Law states that t
= _____________
V = _____________________ % of V V = ___________
A
3 A
V
3
Predicted = ____________________.
Change
V
A
to 22 volts and measure V
3
.
V
3
Measured = ____________________.
7. V
3
is now what percentage of V
A
? _____________________ %
Is this the same percentage as when the applied voltage = 12.5 volts?
________
1k
4.7k
18k
1
2
R
3
Figure 11-1
R
+
R
V
A
_
V
1
V
A