Electric Current Class 6 DAV Solutions

 D. Answer the following questions in brief

1. State the function of the metallic strips used in a torch.

Answer:

The metallic strips in a torch connect the battery terminals to the bulb and allow electric current to flow through the circuit.

2. The given diagram shows a dry cell with its different parts marked as 1, 2, 3, 4 and 5. Which of them are the ‘two terminals’ of the dry cell?

Answer:

The two terminals of a dry cell are:

Positive terminal: the metal cap at the top

Negative terminal: the flat metal base at the bottom

(These correspond to the top and bottom parts of the cell in the diagram.)

3. Write the meaning of the term ‘electric circuit’.

Answer:

An electric circuit is a complete closed path through which electric current flows.

4. State the role of an electric switch in an electric circuit.

Answer:

An electric switch is used to make or break the circuit, thereby controlling the flow of electric current.

5. Tools like screwdrivers and pliers used by electricians have handles made up of (or covered with) plastic, rubber or wood. Why?

Answer:

Plastic, rubber, and wood are insulators. They do not allow electric current to pass, thus protecting electricians from electric shock.

6. Why should we always dry our hands before touching an electric appliance or a switch?

Answer:

Wet hands can conduct electricity. Drying hands prevents electric shock and ensures safety.

E. Answer the following questions:

1. Write in brief the working of an electric torch.

Answer:

When the switch of a torch is turned ON, the circuit is completed. Electric current flows from the battery to the bulb, causing the filament to glow and produce light. When the switch is turned OFF, the circuit breaks and the bulb goes off.

2. A student connected an electric bulb to a cell through a switch, but the bulb did not glow even when the switch was ON. Mention any two reasons.

Answer:

Any two possible reasons are:

The bulb may be fused.

The cell may be exhausted (dead).

(Other correct reasons: loose connection or broken wire.)

3. Separate the following devices into categories:

Devices:

kettle, iron press, calculator, toaster, mobile phone, washing machine, radio, transistor, computer, microwave oven

(i) Work with either batteries or mains:

Radio

Computer

(ii) Work with batteries only:

Calculator

Mobile phone

Transistor

(iii) Work with mains only:

Electric kettle

Iron press

Toaster

Washing machine

Microwave oven

4. Match the labels to the correct parts of the circuit.

Answer: 

Provides electricity. - > Electric cell (battery)

A device for making/breaking a circuit -> Switch

Device which lights up -> Bulb

5. Will this circuit work? Justify your answer.

Answer:

No, this circuit will not work because the switch is open, so the circuit is incomplete and electric current cannot flow.

6. Distinguish between conductors and insulators of electricity. Give two examples of each.

Answer:

Conductors:

Allow electric current to pass

Examples: Copper, Iron

Insulators:

Do not allow electric current to pass

Examples: Plastic, Rubber