phy-112 lab 4 compound circuits
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Dec 6, 2023
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PHY 112 L
Name: Kyle Pfannkuch
Class Day: Monday, 3:15
Professor: Lee Brown
Lab 4:
Compound Circuits
1.
Testable Question:
To measure and calculate currents and voltages in a compound circuit with 5 resistors and a singular battery.
2.
Hypothesis: That both the currents and voltages can be calculated correctly using Ohms and Kirchhoff’s Law
3.
Variables: Control(s): Resistors (Ω), Battery (V) Independent: Measured Resistance (Ω), Measured
Currents (A), Measured Voltage (V)
PHY 112 L
Dependent: Calculated Currents (A), Calculated Voltages (V)
Control(s):
Resistors (kiloohms), Battery (V) Independent:
Measured Resistance (kiloohms), Measured Currents (mA) and Measured Voltage
(V) Dependent:
Calculated currents (mA) and Calculated voltage (V)
4.
Experimental Design: i
R (
Ω
)
V (V)
I (A)
1 – 8
R1
1 – 8
R2
1 – 8
R3
1 – 8
R4
1 – 8
R5
5.
Materials: A bullet point
list of items; prepared on your own.
5 different resistors
Multimeter, voltmeter, and ammeter
Wires
Power Supply
Alligator clips
6.
Procedures:
Draw circuit diagram and label resistors and battery
Use multimeter to measure resistance along all resistors
Connect and put together the circuit using alligator clips.
PHY 112 L
Measure voltage and current across each resistor
Calculate theoretical voltages and current across each resistor
7.
Data Table: Compound Circuit Table:
Measured
Measured
Measured
Calculated
Calculated
% error
% error
i
R
i
(k
Ω
)
V
i
(V)
I
i
(mA)
V
i
(V)
I
i
(mA)
Voltage
Current
R
eq
0.39
1
0.242
6.19
23.5
6.99
25.6
11.4
8.2
2
0.275
3.79
12.6
4.76
13.8
20.4
8.7
3
0.346
2.52
6.82
3.94
7.28
36
6.3
4
0.569
2.54
3.61
3.88
4.46
34.5
19
5
0.107
1.07
10.2
1.09
11.7
1.8
12.8
Calculated R
eq
= 0.39 kiloohms
% error Voltage = 20.8%
% error Current = 11%
8.
Analysis:
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PHY 112 L
Compound Circuit Analysis:
PHY 112 L
9.
Conclusion:
All the voltages and currents were calculated and compared against the measured values taken in this lab. 10.
Evaluation: The hypothesis was proven true by the currents and voltages being calculated using both Ohm’s and Kirchhoff’s laws.
The percent error for the voltage was averaged to be 20.8% and for the current it was averaged to be 11%. A possible source of systematic error could have been caused by an error
in the calculations due to improper conversion of units.
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Recommended textbooks for you
- Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
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