Circuit Analysis Lab Report

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Circuit analysis lab

Lab report 2

TA: Sheena Hussaini

Ohm’s Law

The relationship between voltage, current, and resistance were studied using Ohm’s law.

The lab experiment was based on Ohm`s law states that the current (I) flowing in a circuit is

proportional to the voltage (V) and inversely proportional to the resistance (R). In relation to this

experiment, two circuits were used with resistors arranged in parallel and series. In the circuits

where resistors were in series, voltage dropped across the circuit, and the current was determined

to be constant. However, the circuit with resistors in parallel saw a constant voltage across the

circuit as current dropped over the same.

The power supply produced 15 Volts that were introduced into the circuit. Results on

resistance and current were obtained from the system.

Table 1: Circuit with resistors in series

Description: Voltage (V)

Description: Current (A)

Description: Resistance (R)

15 V

0.00219A

6800 Ω

4.79 V

0.00219A

2178Ω

10.21 V

0.00219A

6430 Ω

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Table 2: Circuit with resistor in parallel

Description: Voltage (V)

Description: Current (A)

Description: Resistance (R)

15 V

0.00322A

2180 Ω

15 V

0.00689A

4610Ω

15 V

0.01011A

1480 Ω

Answers

Are there any appreciable differences between labeled, calculated, and measured values for

the two resistances? What could possibly explain the disparity?

There is a disparity in regard to the calculated values and the measured values in the

experiment. For instance, taking the average of the measures and determining the number of

significant figures to be used might have contributed to the disparity.

How do the voltage across the two resistors relate to the power supply voltage?

The power supply produces the same voltage for the two circuits. However, it is not

constant in the two aspects because it is regulated by the resistor in the parallel circuit. Thus, the

source is consistent in producing power, but the circuit through its resistors regulates the same.

What do you notice about the total resistances of each configuration?

The resistors in series offer a total resistance that is more than the resistance offered by

the largest resistor. This is because the resistance offered is as a result of the summation of the

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three resistors. However, when resistors are in parallel, the total resistance is insignificant in

comparison to the resistance offered by the smallest resistor.

Errors in the Laboratory Experiment

There were minor errors in relation to the two circuits. First, there were human errors. For

instance, the parallax errors associated with reading instruments used in the circuit. Equally,

errors would emerge from the number of significant figures used. At times, persons tend to

ignore small numbers leading to errors in the final results. Moreover, there is internal resistance

of the multimeters and wires to complete the connection of the circuit. Thus, these errors are

unavoidable; but would be minimized in a circuit.

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