Worksheet 12: Class 6 Science - Electricity and Circuits

Welcome! This worksheet will help you understand the basics of electricity and how an electric circuit works. We will learn about electric cells, bulbs, switches, and the difference between conductors and insulators. Let's get charged up!

Electricity: The Flow of Current

We use electricity for many things, from lighting up our homes to running our gadgets. An **electric cell** is a source of electricity. It has a positive (+) terminal and a negative (-) terminal. An electric bulb lights up when electricity flows through it. A complete path for electricity to flow is called an **electric circuit**.

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A simple electric circuit has an electric cell, a bulb, and connecting wires. An **electric switch** is a device that can open or close a circuit. When the switch is in the 'on' position, the circuit is **closed**, and electricity can flow, lighting the bulb. When the switch is in the 'off' position, the circuit is **open**, and the bulb does not light up because the path is broken.

Conductors and Insulators

Materials that allow electric current to pass through them are called **conductors**. Metals like copper, iron, and aluminum are good conductors. Materials that do not allow electric current to pass through them are called **insulators**. Examples include plastic, rubber, and wood. Insulators are used to cover electrical wires to prevent electric shocks.

Practice Questions

1. Fill in the blank: An electric cell has two terminals, a positive (+) terminal and a _____ (-) terminal.

Negative

2. True or False: A conductor does not allow electric current to pass through it.

False. A **conductor** allows electric current to pass through it. An **insulator** does not.

3. Match the item to its category:

(a) A copper wire (i) Insulator

(b) A piece of plastic (ii) Conductor

(c) Rubber band (iii) Insulator

(d) An iron nail (iv) Conductor

a - ii, b - i, c - iii, d - iv

4. What is the difference between an open circuit and a closed circuit?

In a **closed circuit**, the path for the electric current is complete, allowing the current to flow and the bulb to light up. In an **open circuit**, the path is broken, and the current cannot flow, so the bulb does not light up.

5. Fill in the blank: The device used to open or close an electric circuit is called an _____.

Electric switch

6. Why are the handles of screwdrivers often made of plastic?

The handles of screwdrivers are made of plastic because plastic is an **insulator**. This prevents a person from getting an electric shock while working on electrical devices.

7. Name the four basic components of a simple electric circuit.

Electric cell, bulb, switch, and connecting wires.

8. What is the role of an electric cell in a circuit?

An electric cell provides the source of electric current for the circuit.