Energy Transformation

Q.

A battery contains chemical energy and changes it into electrical energy but when it gets charged the energy going into is electrical energy. So my question is that can a battery change electrical energy into chemical energy

Q.

What is the SI and CGS unit of energy?

Q.

What are the advantages of a Slip Ring Induction Motor?

Q.

Write the energy transformation that takes place in the following :

Thermal power plant

Q.

What is a flat plate collector?

Q. Which of the following appliances is not based on the principle of heating effect of current?

1. Electric kettle
2. Electric bulb
3. Electric bell
4. Electric iron

Q. How can we get electricity out of magnetism? Explain

Q. Can an A.C. generator convert mechanical energy into electrical energy?

Q.

Can a constant velocity be maintained in a body moving on a rough source without doing any work on it?

Q.

Which effect is utilized by an electric bulb?

Q.

A tube light converts ___.

1. electrical energy to light energy

2. light energy to electrical energy

3. electrical energy to mechanical energy

4. mechanical energy to electrical energy

Q.

Name a source of light which emits light and heat simultaneously.

1. Firefly

2. All of the above

3. Glowing Bulb

4. Tube light

Q.

Why does a saw become warm when it is used to cut a log of wood?

Q.

Name the energy transformation taking place in the following device: a motor

Q.

Why do bulbs have two terminals?

Q. In steam engines, the chemical energy of coal is converted into ______ energy of the steam.

1. magnetic
2. electical
3. chemical
4. heat

Q.

If the efficiency of a machine is $90\%$, this means that $90\%$ of work input has been lost in overcoming friction.

1. True
2. False

Q.

What type of energy transformation takes place in an electric generator?

Q.

A man eats glucose and makes a block move, which then comes to rest after sliding on a rough floor. The correct order of energy changes can be:

1. heat - kinetic - chemical

2. Data insufficient

3. chemical - heat - kinetic

4. chemical - kinetic - heat

Q.

When we switch on the electrical bulbs, one form of energy is converted into another form. Name these forms of energy.

Q.

What kind of energy transformations take place at a thermal power station?

Q. Statement 1: Electric heater works on the principle of heating effect of current.
Statement 2: The heating element used in electric heater is made up of copper.

1. Statement 1 is false, statement 2 is true
2. Statement 1 is true, statement 2 is false
3. Both statements are true
4. Both statements are false

Q.

A truck and a car running with same velocity. Which of the two has less kinetic energy?

Q. What are the various energy transformations that occur when you are riding a bicycle ?

1. Muscular energy to kinetic and heat energy
2. Mechanical energy to chemical and light energy
3. Chemical energy to Internal energy
4. Rotational energy to muscular energy

Q.

The energy conversion taking place in an AC generator is

1. mechanical to electrical

2. electrical to mechanical

3. magnetic to electrical

4. electrical to magnetic

Q.

Name the appliances which work under the following energy transformation.

Sound energy into electrical energy.

Q.

a) What is wind energy?
b) Why is wind energy considered an indirect source of solar energy?

Q.

State the changes in form of energy while producing hydroelectricity

Q.

State, in brief, the process of harnessing the kinetic energy of the wind to do work, mentions some limitations of harnessing wind energy on a large scale.

Q.

Energy can exist in many form and may change from one form to another. Give two examples to show the conversion of energy from one form to another.