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Questions and Answers
What is the unit for measuring electrical resistance?
What is the unit for measuring electrical resistance?
Metals are poor conductors of electricity.
Metals are poor conductors of electricity.
False
What device is used to measure resistance?
What device is used to measure resistance?
Ohmmeter
_____ wires have less internal resistance than thinner ones.
_____ wires have less internal resistance than thinner ones.
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Match the factors affecting resistance with their descriptions:
Match the factors affecting resistance with their descriptions:
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Which of the following materials is a great conductor?
Which of the following materials is a great conductor?
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Resistance decreases when the temperature of an object increases.
Resistance decreases when the temperature of an object increases.
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What is a typical application of a resistor in a circuit?
What is a typical application of a resistor in a circuit?
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An ________ offers a great deal of resistance to electron flow.
An ________ offers a great deal of resistance to electron flow.
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As the length of a wire increases, what happens to its resistance?
As the length of a wire increases, what happens to its resistance?
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Study Notes
Resistance in Circuits
- Electrical resistance opposes electron flow in a circuit.
- Resistance symbol is R.
- Unit of resistance is the ohm (Ω).
- Insulators resist electron flow, conductors allow it.
- Metals are good conductors (e.g., copper, silver, gold).
Factors Affecting Resistance
- Material type: Metals are best conductors.
- Cross-sectional area: Thicker wires have lower resistance; electrons have more room to move. (e.g., #14 wire vs. #20 wire)
- Length: Longer wires have higher resistance; electrons travel through more material.
- Temperature: Increased temperature increases resistance; atoms vibrate more, hindering electron flow.
Measuring Resistance
- An ohmmeter measures resistance.
- It's connected in parallel, similar to a voltmeter.
Resistors in Circuits
- A dimmer switch is a type of resistor.
- Resistors reduce current in a circuit.
- Variable resistors include dimmer switches and volume controls.
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Description
Test your knowledge on the principles of electrical resistance, including factors that affect it and how to measure it. Explore the roles of materials, wire characteristics, and temperature in resistance. This quiz will help reinforce your understanding of basic circuit components and their functions.
