Visualizing the Electric Current

Q.

Find the number of electrons, protons and neutrons present in ${}_{12}{}^{24}\mathrm{Mg}$.

Q.

Name the three sources of electricity.

Q.

Electrical energy is converted into light energy in _________.

1. electric press

2. electric oven

3. electric bulb

4. electric heater

Q.

Which of the following converts light energy into electrical energy?

1. Motor

2. Battery

3. Solar cell

4. None of these

Q.

Write the symbol of a battery in an electric circuit.

Q.

A cell converts mechanical energy into electrical energy.

1. True
2. False

Q.

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

Q.

Find the odd one out.

dry cell; solar cell; generator; electric bulb

Q.

Insulators can be charged but do not conduct electric charge.

1. True

2. False

Q.

​What will happen if the guy in our example, who picks up balls from below and puts it on top of the C-shaped tube, stops doing his job?

1. The current of the balls will continue

2. The balls will start going backwards

3. The current of the balls will stop

4. There will be no change in the behaviour of the given example.

Q.

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

Q.

Which particle flows to produce electric current in a wire?

1. Neutron

2. Atom

3. Electron

4. Proton

Q.

Which of the following energy conversions take place in a torch?

1. $Electrical\to Chemical\to Light$

2. $Chemical\to Electrical\to Light$

3. $Electrical\to Light\to Chemical$

4. $Light\to Chemical\to electrical$

Q. Select the correct alternative:
In a torch, the source of electricity is

1. 
   the switch
2. 
   the mains
3. 
   the bulb
4. 
   the cell

Q. An increase in voltage causes an increase in ___.

Q. Pick the material that freely allows electrons to pass through.

1. Silver
2. Wood
3. Rubber
4. Cotton

Q. WHAT MAKES WOOD A BAD CONDUCTOR OR A GOOD INSULATOR?

Q.

Electric current is said to be the flow of _____.

1. electrons

2. protons

3. neutrons

4. All of the above.