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12 Questions

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Rheostat and Resistance in Conductors

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Questions and Answers

What is the unit of resistivity for a material?

Ohm

Ohm metre (correct)

Metre

Volt

How is a rheostat used to regulate current in a circuit?

By changing the capacitance gradually

By changing the voltage gradually

By changing the current gradually

By changing the resistance gradually (correct)

In conductors, what is responsible for the flow of current?

Electrons (correct)

Protons

Neutrons

Ions

What is the role of emf in enabling current flow in a circuit?

Supplying electrical energy Signup and view all the answers

What is resistivity?

The resistance of a conductor of unit length and unit area of cross section Signup and view all the answers

If the length of a uniform wire is doubled, what happens to its resistivity?

There is no change Signup and view all the answers

What happens to the resistance of a conductor when its temperature increases?

It increases Signup and view all the answers

In the parallel connection of cells, what happens to the current if the number of cells is increased?

The current remains the same Signup and view all the answers

What is the resistance of the conductor in the given table?

12 ohms Signup and view all the answers

From the first two circuits, which lamp is likely to glow with more brightness and why?

Lamp in circuit 2, because it has lower resistance Signup and view all the answers

What are two more factors that influence the resistance of a conductor, in addition to length and thickness?

Nature of the substance and temperature Signup and view all the answers

How does the resistance of a conductor change with temperature?

It increases with increasing temperature Signup and view all the answers