Science Do as directed; [1 M ]

Name five appliances or machines which use an electric motor.

What is the power of a body which is doing work at the rate of one joule per second?

Name the device or machines which convert: Electrical energy into sound energy.

Name the device or machines which convert: Chemical energy into electrical energy.

Name the device or machines which convert:
Light energy into heat energy.

What kind of energy is possessedby the following?

A running car.

What kind of energy is possessedby the following?
A compressed spring.

How many joules are there in one kilowatt-hour?

Is work a scalar or a vector quantity.

Name the device or machines which convert: Electrical energy into light energy.

Name the quantity whose unit is: Kilowatt.

What happens to the potential energy of a body when its height is doubled?

Name the device or machines which convert: Chemical energy into heat energy.

Name the device or machines which convert:Light energy into electrical energy.

What is the condition for a force to do work on a body?

Which would have a greater effect on the kinetic energy of an object: doubling the mass or doubling the velocity?

What kind of energy is possessedby the following?
A stretched rubber band.

Is energy a vector quantity?

A cell converts one form of energy into another form. Name the two forms.

What kind of energy is possessedby the following?
Water stored in the reservoir of a dam.

Write the energy transformations which take place in an electric bulb (or electric lamp).

Name the device or machines which convert: Chemical energy into kinetic energy (or mechanical energy).

Define the term ‘watt’.

Name the device which converts electrical energy into mechanical energy.

When a ball is thrown vertically upwards, its velocity goes on decreasing. What happens to its potential energy as its velocity becomes zero?

Name the device or machines which convert: Mechanical energy into electrical energy.

Name the commercial unit of measurement of energy.

What kind of energy is possessedby the following?
A stone kept on roof-top.

How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.

Name the quantity whose unit is:
Kilowatt-hour.

Describe the energy changes which take place in a radio.

Is potential energy a vector or a scalar quantity?

Name two units of power bigger than watt.

A body is thrown vertically upwards. Its velocity goes on decreasing. What happens to its kinetic energy as its velocity becomes zero?

Name the device or machines which convert: Heat energy into kinetic energy (or mechanical energy).

What do you understand by the kinetic energy of a body?

On what factors does the kinetic energy of a body depend?

What kind of energy transformations takes place at a hydroelectric power station?

Name the physical quantity whose unit is watt.