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  5. General Physics II (PHYS20400)

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Lab Report 3 - Circuit Basics
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Lab Report three sample for Physics 204. Includes extended descriptions for Introduction, Methods, Calculations, Discussion, and Conclusion to help ensure full marks in your reports. Please beware plagiarism as you look the document over and for any questions, refer to your TA.

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  • January 23, 2023
  • 11
  • 2022/2023
  • Essay
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Experiment 3: Circuit Basics

Introduction:

We see circuits in our everyday lives as extensions of our favorite appliances. We use

them to funnel current through these appliances, making electric lighting and many other things

possible in our time. Through the specific wiring methods used in our daily lives – such as

wiring in series or parallel circuits – we can branch out the functions for many of our appliances.

For instance, we are able to use series circuits in things like streetlights to allow the same amount

of current to pass through multiple appliances using a single power source and parallel circuits in

house wiring to allow the current running through each branch to run independently of each

other. By knowing the physical properties of currents and the factors that can change them, we

are also able to use appliances safely in our households by altering current according to whatever

amount be able to be safely used by an appliance via resistors.

The circuits that allow us to use our everyday appliances involve three main components:

voltage, current, and resistors. The main idea behind this lab is to learn how to analyze and

measure the basic properties of circuits in terms of voltage, current, and resistance by building

currents and testing for these properties.

Procedure:

First, the warmup exercise was done to get used to using the equipment presented to us

for the experiments. Using the digital multimeter on our station, we measured the resistance of

each type of resistor on the table by setting the rotary switch to Ohm, connecting the black test

lead to the COM port, and connecting the red test lead to the V port. The voltage of the batteries

was then measured by changing the rotary switch to the DC voltage setting and connecting the

red lead to the positive terminal and the black led to the negative terminal of the battery. The

, 2


value was then recorded. The batteries were then placed in the circuit board and measured in

series for current in Amperes by attaching a wire in between their terminals, attaching the red

port to the 10 A terminal, turning the rotary switch to the A setting, and applying the red and

black leads to the respective positive and negative ends of the battery. Without changing

anything on the circuit board, the red cable is moved to the mA connection and the rotary turned

to the 400 mA setting to measure the current in milliamperes (mA). Both the measurements in A

and mA were noted down.

To do experiment 1, a simple circuit was created following the diagrams provided by the

manual – Figure 1 – using connector wires and batteries on the circuit board. After making sure

the light bulb could illuminate, a resistor was added to the circuit. To do so, the diagram and

photo shown in Figure 2 was followed and a resistor around 500 Ω was used. Any observations

were noted down. Next, a potentiometer was added to the circuit in series by following the

diagram in Figure 3. The knob on the potentiometer was turned to observe any changes

happening and the observation was noted down.




Figure 1: Circuit with simple light bulb photo (left); circuit diagram (right).

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