Resistance in a Wire
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Ivy Tech Community College, Indianapolis *
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Course
102
Subject
Electrical Engineering
Date
Dec 6, 2023
Type
docx
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3
Uploaded by DeaconSnowBison36
Resistance in a Wire
Lab
This lab uses the
Resistance in a Wire
and
Circuit Construction Kit DC
simulation from PhET
Interactive Simulations at University of Colorado Boulder, under the CC-BY 4.0 license.
https://phet.colorado.edu/sims/html/resistance-in-a-wire/latest/resistance-in-a-wire_en.html
https://phet.colorado.edu/sims/html/circuit-construction-kit-dc/latest/circuit-construction-kit-dc_en.html
Learning Goals:
1.
Explore the characteristics of a resistor that are variable in this model.
2.
Identify how each characteristic affects the resistance and current flow.
3.
Explain your ideas about why the characteristics change the resistance and current flow.
4.
Use understanding to make predictions about a circuit with lights and batteries.
Develop your understanding:
1.
Open
Resistance in a Wire
, then explore to develop your own ideas about how the construction of a
resistor affects its resistance and
also ability to allow current to flow.
Describe several of your experiments and your observation with captured images from the simulation.
The resistance of the wire is directly proportional to the length and inversely proportional to the
cross-sectional area. The p is the resistivity, which is the characteristic of the material. As I increase the
resistivity, the resistance also increases and there are more dots on the wire. When I increase the length, the wire
increases in size and so does the resistance. When I increase the area, the resistance decreases dramatically.
4/2/20 Loeblein
https://phet.colorado.edu/en/contributions/update-success/5435
page
1
Demonstrate your understanding:
Directions: As you answer
the questions,
explain
in your own words why your answer makes sense and
provide evidence
from your #1 experiments. Add more experiments to #1 if you need to get better
evidence.
2. If you change the cross sectional area of the resistor, how does
a.
the resistance change? (answer, explain, evidence)
Evidence is shown above. When I increased the cross-sectional area of the resistor, the
wire increases in size but the resistor decreases. The resistance is inversely proportional
to the cross-sectional area.
b.
the current through a circuit change? (answer, explain, evidence)
When the resistance is decreased, the cross-sectional area increases and so does the
current.
3.
If you change the length of the resistor, how does
a.
the resistance change? (answer, explain, evidence)
Evidence is shown above in one of my screenshots. When I increased the length of the wire, the
resistance increased as well.
b.
the current through a circuit change? (answer, explain, evidence)
The current decreases as the length of the resistor increases which then increases the
resistance amount. Increasing the cross-sectional area will decrease the resistance and
increase the current.
4.
If you change the resistivity of the resistor, is the effect like changing the length or changing the
area? (answer, explain, evidence)
The resistivity of the resistor doesn’t depend on change of length or change of the area.
4/2/20 Loeblein
https://phet.colorado.edu/en/contributions/update-success/5435
page
2
5. During manufacturing, how is the resistivity of a resistor changed? Cite your references
During manufacturing, the resistivity of a resistor is changed through pattern. Manufacturers
increase the resistance by cutting a pattern into the film in order to increase the path of the electrical
current.
https://eepower.com/resistor-guide/resistor-fundamentals/electrical-resistivity/#
6.
Consider the two circuits below in which the left resistor is
and the right one is
Use your understanding of voltage, resistance, and current to answer these questions:
a.
What do you think will happen when the switches are turned closed?
(answer, explain, evidence)
When I closed the switch, the lightbulb lit. When the switch is open, the lightbulb is
off.
b.
How do you think the lights’ brightness will compare?
The light’s brightness is best when the switch is closed. The closed switch causes less
resistance and the current is higher.
c.
Open the
Intro
screen of Circuit Construction Kit DC. Build the 2 circuits and check your
answers. Insert a capture of the circuits with the switch closed for supporting evidence.
4/2/20 Loeblein
https://phet.colorado.edu/en/contributions/update-success/5435
page
3
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