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What is the role of a rheostat in a circuit?

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Important Questions on Current Electricity

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Science>Physics>Current Electricity>Electric Resistance
What factors affect the resistance of a conductor?
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Science>Physics>Current Electricity>Electric Resistance
What is the effect of combining resistors in series?
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Science>Physics>Current Electricity>Electric Resistance
Select the correct statement about series and parallel circuit.
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Science>Physics>Current Electricity>Electric Resistance
Which material has the highest resistivity?
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Science>Physics>Current Electricity>Electric Resistance
What is the advantage of using alloys for resistors?
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Science>Physics>Current Electricity>Electric Resistance
Which conductor has the lowest resistivity?
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Science>Physics>Current Electricity>Electric Resistance
What is the formula for calculating resistance?
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Science>Physics>Current Electricity>Electric Resistance
Carbon is a (an)
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Science>Physics>Current Electricity>Electric Resistance
What type of material is used for heating elements?
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Science>Physics>Current Electricity>Electric Resistance

Two 5 Ω resistors are first connected in series and then in parallel to a battery of 20 V. Which of the following is a similarity between series and parallel circuits?

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Science>Physics>Current Electricity>Electric Resistance
Why is copper used for electrical wiring?
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Science>Physics>Current Electricity>Electric Resistance
What is the unit of resistivity?
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Science>Physics>Current Electricity>Electric Resistance
What is the relationship between resistance and conductivity?
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Science>Physics>Current Electricity>Electric Resistance
What is the relationship between resistance and temperature in a conductor?
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Science>Physics>Current Electricity>Electric Resistance
Resistance of a conductor depends on 
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Science>Physics>Current Electricity>Electric Resistance
What happens to the resistance of a superconductor at critical temperature?
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Science>Physics>Current Electricity>Electric Resistance
_____ is the resistance of a conductor of unit length and cross-sectional area.
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Science>Physics>Current Electricity>Electric Resistance
The opposition to flow of charges in a material is known as 
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Science>Physics>Current Electricity>Electric Resistance
What happens to resistance if the cross-sectional area of a wire is doubled?
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Science>Physics>Current Electricity>Electric Resistance
How is resistivity different from resistance?