EEE141Lab1 - Lab 1 PDF

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Lab 1...

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North South University Department of Electrical & Computer Engineering

LAB REPORT Subject Name: Electrical Circuits Lab Experiment Number: 01 Experiment Name: Verification of Ohm's Law

Experiment Date: 04/11/20 Report Submission Date: 07/11/20 Section: 08 Group Number: Student Name & ID: Redwanur Rahman Rafi 1812383042

Score:

Objective: We have to measure the voltage, current and resistance values using a DMM (digital multimeter) and verify the validity of Ohm’s law.

Equipment List: 1. 2. 3. 4.

Trainer board LED Resistors(3.3kΩ , 4,7kΩ, 8kΩ) Digital Mutimeter (DMM)

Theory: Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Equation: V = I × R Where, V: voltage measured in volts I: current measured in amperes R: resistance measured in ohms

Circuit Diagram:

Experiment Table: 3.3KΩ Voltage

EXP Current

EXP IR

EXP Power

Theory Current

2 4 6 8 10

0.60mA 1.20mA 1.81mA 2.42mA 3.02mA

1.98V 3.96V 5.97V 7.99V 9.97V

1.20mW 4.80mW 10.9mW 19.4mW 30.2mW

4.7kΩ Voltage

EXP Current

EXP IR

2 4 6 8 10

0.40mA 0.95mA 1.28mA 1.70mA 2.13mA

8.0kΩ Voltage 2 4 6 8 10

Theory IR

Theory Power

Error % Current

Error % IR

Error% Power

0.61mA 2.01V 1.21mA 3.99V 1.81mA 5.97V 2.42mA 7.99V 3.03mA 9.99V Table 1

1.22mW 4.84mW 10.9mW 19.4mW 30.3mW

1.63% 0.82% 0.00% 0.00% 0.33%

1.49% 0.76% 0.00% 0.00% 0.20%

1.64% 0.83% 0.00% 0.00% 0.33%

EXP Power

Theory Current

Theory Power

Error % Current

Error % IR

Error% Power

1.88V 4.47V 6.02V 7.99V 10.0V

0.80mW 3.80mW 7.68mW 13.6mW 21.3mW

0.42mA 1.97V 0.85mA 4.46V 1.27mA 5.99V 1.70mA 7.99V 2.12mA 9.96V Table 2

0.84mW 3.40mW 7.62mW 13.6mW 21.2mW

4.76% 11.8% 0.78% 0.00% 0.47%

4.57% 0.22% 0.50% 0.00% 0.40%

4.76% 11.8% 0.78% 0.00% 0.47%

EXP Current

EXP IR

EXP Power

Theory Current

Theory Power

Error % Current

Error % IR

Error% Power

0.26mA 0.50mA 0.75mA 1.00mA 1.26mA

2.08V 4.00V 6.00V 8.00V 10.1V

0.52mW 2.00mW 4.50mW 8.00mW 12.6mW

0.25mA 2.00V 0.50mA 4.00V 0.75mA 6.00V 1.00mA 8.00V 1.25mA 10.0V Table3

0.50mW 2.00mW 4.50mW 8.00mW 12.5mW

4.00% 0.00% 0.00% 0.00% 0.80%

4.00% 0.00% 0.00% 0.00% 1.00%

4.00% 0.00% 0.00% 0.00% 0.80%

Theory IR

Theory IR

Graph 1: Using 3.3kΩ experiment values

12 10

Voltage

8 6

4 2 0 0

0.5

1

1.5

2 Current

Resistance is the gradient of the graph Therefore, R =

𝑦1 −𝑦2 𝑥1−𝑥2 9−5

= (2.75−1.5)×10−3 = 3.2kΩ

2.5

3

3.5

Graph 2: Using 4.7kΩ experiment values

12 10

Voltage

8 6

4 2 0 0

0.5

1

1.5 Current

Resistance is the gradient of the graph Therefore, R =

𝑦1 −𝑦2 𝑥1−𝑥2

9.2−4.8

= (2−1)×10−3 = 4.4kΩ

2

2.5

Graph 3: Using 8.0kΩ experiment values

12 10

Voltage

8 6

4 2 0 0

0.2

0.4

0.6

0.8 Current

Resistance is the gradient of the graph Therefore, R =

𝑦1 −𝑦2 𝑥1−𝑥2

8.8−3.2

= (1.1−0.4)×10−3 = 8.0kΩ

1

1.2

1.4

Discussion: The resistance measured from the graph of the experimental values is somewhat equal or close to the original resistance used. This may be due to an error in measuring the current of the 3 experiments....