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What is electrical resistance?
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Electrical resistance is a property of a material that resists the flow of electric current through it.
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How is resistance calculated using Ohm's Law?
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Resistance is calculated using Ohm's Law as R = V/I, where R is resistance, V is voltage, and I is current.
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What factors affect the resistance of a conductor?
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The resistance of a conductor is affected by its length, cross-sectional area, material, and temperature.
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Why does resistance increase with temperature in metallic conductors?
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Resistance increases with temperature in metallic conductors because atomic vibrations increase, hindering the flow of electrons.
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What is resistivity and how is it related to resistance?
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Resistivity is a material-specific property that quantifies how strongly a material opposes the flow of electric current. It is related to resistance through the formula R = ρ(L/A).
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What unit is used to measure resistance?
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Resistance is measured in ohms, symbolized by the Greek letter Ω (omega).
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What is the role of a resistor in an electrical circuit?
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A resistor limits the flow of electric current in a circuit and is used to control the current to other components.
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What happens to the resistance if the length of a wire is doubled?
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If the length of a wire is doubled, its resistance also doubles, assuming the material and cross-sectional area remain constant.
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What is a superconducting material?
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A superconducting material is one that can conduct electricity without resistance below a certain temperature called the critical temperature.
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Can resistance be negative?
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In classical physics, resistance cannot be negative. Negative differential resistance can occur in certain electronic components due to specific interactions.
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How does the cross-sectional area of a wire affect its resistance?
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The resistance of a wire decreases as its cross-sectional area increases, as they are inversely proportional.
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What type of material typically has low resistivity?
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Metals generally have low resistivity, which makes them good conductors of electricity.
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How is a multimeter used to measure resistance?
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A multimeter is used to measure resistance by setting it to the resistance (Ω) mode and connecting its probes across the component.
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What is a variable resistor and its use?
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A variable resistor, or potentiometer, is a device where the resistance can be adjusted manually to control the current in a circuit.
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Does resistance increase or decrease when the diameter of the wire is doubled?
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The resistance decreases when the diameter of the wire is doubled, assuming the material and length remain constant.
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