Current Electricity

What is the characteristic of the resistance of thermistors with respect to temperature?

It changes very rapidly with change of temperature.

What does the resistivity of a material depend on?

Both the dimensions and temperature of the material.

What is the effect of stretching a conductor on its resistance?

The resistance increases due to increase in length and decrease in area.

What is the unit of resistivity?

Ohm-metre (Ωm) Signup and view all the answers

What is the significance of the temperature coefficient of resistance?

It is a measure of how the resistance of a material changes with temperature. Signup and view all the answers

What is the unit of resistivity?

ohm per meter Signup and view all the answers

What is the relationship between resistance and length of a conductor?

Directly proportional Signup and view all the answers

What is the dimension of resistance?

[ML^2 T^-3 A^-2] Signup and view all the answers

What is the temperature coefficient of resistance?

Change in resistance per unit change in temperature Signup and view all the answers

What is the formula for resistivity?

R = ρl/A Signup and view all the answers

What is the term given to the property of a substance that opposes the flow of current through it?

Electrical resistance Signup and view all the answers

What is the formula for the resistance of a conductor?

R = ρl / A Signup and view all the answers

What is the S.I. unit of resistivity?

Ohm-meter (Ωm) Signup and view all the answers

What happens to the drift velocity of electrons in a conductor when its diameter is doubled?

It remains the same Signup and view all the answers

What is the term given to the change in resistance of a material with a change in temperature?

Temperature coefficient of resistance Signup and view all the answers

What happens to the equivalent emf when x cells are wrongly connected in a combination of n identical cells?

It becomes (n - 2x)E Signup and view all the answers

What is the condition for maximum power consumption by a load?

R = r Signup and view all the answers

What is the net resistance across HE in a skeleton cube made of 12 equal resistors each having resistance R?

R Signup and view all the answers

What happens to the current in a circuit when the internal resistance of the cell is zero?

It becomes infinite Signup and view all the answers

What is the equivalent internal resistance of n identical cells connected in series?

nr Signup and view all the answers

What is the equivalent emf of a combination of n identical cells connected in series?

nE Signup and view all the answers

If n identical cells are connected in parallel, what is the equivalent internal resistance of the combination?

r/n Signup and view all the answers

What is the condition for maximum power in a circuit?

R = nr Signup and view all the answers

What happens when two terminals of a cell are joined together by a thick conducting wire?

The resistance becomes zero Signup and view all the answers

What is the purpose of using a mixed grouping of cells?

To use when the internal resistance is greater than the external resistance Signup and view all the answers

What happens to the emf's of cells when they are connected in series?

They are added to each other Signup and view all the answers

What is the condition for maximum power transfer to a load?

R = r Signup and view all the answers

What is the current that flows momentarily when a cell is short-circuited?

E/r Signup and view all the answers

What is the effect of internal resistance on the emf of a cell?

It decreases the emf Signup and view all the answers

What happens to the internal resistances of cells when they are connected in parallel?

They are combined in a way that reduces the overall internal resistance Signup and view all the answers

Current Electricity

Questions and Answers

What is the characteristic of the resistance of thermistors with respect to temperature?

What does the resistivity of a material depend on?

What is the effect of stretching a conductor on its resistance?

What is the unit of resistivity?

What is the significance of the temperature coefficient of resistance?

What is the unit of resistivity?

What is the relationship between resistance and length of a conductor?

What is the dimension of resistance?

What is the temperature coefficient of resistance?

What is the formula for resistivity?

What is the term given to the property of a substance that opposes the flow of current through it?

What is the formula for the resistance of a conductor?

What is the S.I. unit of resistivity?

What happens to the drift velocity of electrons in a conductor when its diameter is doubled?

What is the term given to the change in resistance of a material with a change in temperature?

What happens to the equivalent emf when x cells are wrongly connected in a combination of n identical cells?

What is the condition for maximum power consumption by a load?

What is the net resistance across HE in a skeleton cube made of 12 equal resistors each having resistance R?

What happens to the current in a circuit when the internal resistance of the cell is zero?

What is the equivalent internal resistance of n identical cells connected in series?

What is the equivalent emf of a combination of n identical cells connected in series?

If n identical cells are connected in parallel, what is the equivalent internal resistance of the combination?

What is the condition for maximum power in a circuit?

What happens when two terminals of a cell are joined together by a thick conducting wire?

What is the purpose of using a mixed grouping of cells?

What happens to the emf's of cells when they are connected in series?

What is the condition for maximum power transfer to a load?

What is the current that flows momentarily when a cell is short-circuited?

What is the effect of internal resistance on the emf of a cell?

What happens to the internal resistances of cells when they are connected in parallel?

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