The set up in the figure is used to study the relationship between current (I) and potential difference (V) for a wire X.

The rheostat Y is used to:

Which of the following statements describes an electric generator?

The heating element of an electric kettle has a resistance of 30.0 Ω.

The kettle is connected to an a.c. power supply of root means square voltage 230 V.

The peak value of the current is:

In the comparison of heat and electrical energy flowing along a well insulated conductor which of these is/are true?

1) The Pd across the ends of the conductor is analogous to the temperature difference between the ends of the conductor.

2) The electric current is analogous to the rate of flow of heat.

3) The electrical resistance is analogous to the of thermal conductivity.

An impulse of 100 N is applied to an object.

If this same impulse is delivered over a longer time interval: