Technical data

27
Series
es tance in Series Circuits
oject Objective:
• To verify the series circuit resistance formula by making resistance measurements under
various circuit conditions.
ms Needed:
- Electronics Trainer - Digital multi-meter
- Jumper Wires - Resistors: 3-10k, 47k, 100k, & 220k
hen making resistance measurements, make sure there is no power applied to the circuit.
Circuits
R
Pr
is
Ite
W
Experiment
1. Connect the circuit as shown in Figure 9-1.
Remember! Disconnec t the power supply in this project!
orrectly label your answers.
___________________________.
tance of each individ
lues below.
_________________________.
__.
um of the individual resista ces,
___.
.
5. 7k resistor?
.
6. istance.
__.
7. ircuit increases, then the total resistance will
e total
8. = 47k. Predict R
T
and then
__________________
_______________________
_______________________
10k
R
1
2. Measure the resistance of the entire circuit using an
ohmmeter. Remember to c
R total = _
10k
10k
R
2
R
Figure 9-1
3. Measure the ual resistor, and
record the va
resis
3
R
1
= _____________________________.
R
2
= ____
R
3
= ___________________________
4. Since the total resistance of a series circuit equals the s n
R
1
+ R
2
+ R
3
= __________________________
Therefore R
T
= _____________________________
What would the new R be if R were changed to a 4
T 3
Predicted R
T
= _____________________________
Change R
3
to 47k and measure the new total res
New R
T
= ___________________________
In conclusion, if any single resistance in a series c
___________________. If any single resistance in a series circuit decreases then th
resistance will ___________________.
Configure the circuit so that R
1
= 220k, R
2
= 100k, and R
3
measure R
T
to verify.
Predicted R
T
= _____________________ Measured R
T
= ___
Does the measured value equal the predicted value? _____
What could cause a difference? ___________________