Electricity Note Class 6 Science

Electricity

A. Very Short Questions.

1. What is electricity?
   Electricity is a form of energy produced by the flow of electric charges(electrons).
2. Name a source of electricity.
   A source of electricity is cell.
3. What is a cell?
   A cell is a device that converts chemical energy into electrical energy.
4. How many types of cells are commonly used in everyday devices?
   Two types of cells are commonly used in everyday devices.
5. What is an electric circuit?
   An electric circuit is a continuous path through which current flows.
6. What happens in an open circuit?
   No current flows in an open circuit.
7. Which symbol represents a closed circuit?
   
8. What is a fuse?
   A fuse is a safety device that has a thin wire that melts when too much current flows through it.
9. What is the function of a fuse?
   The function of a fuse is to protect the circuit by breaking it when excess current flows.
10. What is a miniature circuit breaker (MCB)?
    An MCB is a safety device that automatically switches off the circuit during excess current.
11. Which symbol represents a bulb in an electric circuit?
    
12. What is the purpose of a switch in an electric circuit?
    The purpose of a switch in an electric circuit is to open or close the circuit.
13. What unit is used to measure electric current?
    The unit that is used to measure electric current is Ampere(A).
14. What is the heating effect of current electricity?
    When electricity flows through a wire, it can make the wire get hot. This is called the heating effect of current electricity.
15. What is the purpose of a miniature circuit breaker (MCB) in a circuit?
    The purpose of a MCB is to protect the circuit by switching it off during overload.

B. Short Questions.

1. Why electricity is important in our daily lives?
   Electricity is important because it is used to run appliances, provide light, and make our daily work easier and faster.
2. How electricity is different from other forms of energy?
   Electricity is different from other forms of energy because it can be easily converted into other forms of energy like heat, light, and sound.
3. Differentiate between simple cell and dry cell.

   Simple Cell	Dry Cell
   i) It uses liquid electrolyte.	i) It uses paste electrolyte.
   ii) It is not portable.	ii) It is portable.

4. Why conducting wires at home covered with plastics?
Conducting wires at home are covered with plastics because plastic is an insulator which prevents electric shock and short circuit.
5. What are the effects of current electricity?
   The effects of current electricity are heating effect, magnetic effect and lighting effect.
6. What is magnetic effect? Why is MCB important?
   When electric current flows through a wire, it creates a magnetic field around it. This is called magnetic effect. MCB is important because it automatically switches off when excess current flows to protect appliances.
7. Differentiate between an open circuit and closed circuit.

   Open Circuit	Closed Circuit
   i) An open circuit consists of a broken path for electricity.	i) A closed circuit consists of a complete path for electricity.
   ii) Switch is off, hence bulb does not glow.	ii) Switch is on, hence bulb glows.

C. Long Questions.

1. Draw a labelled diagram of a simple and dry cell.
   
   
   Figure: Simple Cell
   
   Figure: Dry Cell
2. Draw the symbols of given electrical devices.
   a. Battery 
   
   b. Bulb
   
   c. Fuse 
    
   d. Load
   
   
   
   
   
3. Draw an electric circuit with a cell, wire, a switch and bulb using symbols.
   
4. Study the given figures and answer the following questions.
   a)                                                          
    
   
   b)
   
   i) What is shown in the fig(a) and (b).
   Fig(a): Fuse
   Fig(b): MCB (Miniature Circuit Breaker)
   ii) Name any two differences between the device shown in fig(a) and (b).
   
   

   Fig(a): Fuse	Fig(b): MCB
   i) It has a thin wire that melts when too much current flows through it.	i) It automatically switches off when excess current flows.
   ii) The wire needs to be replaced after melting.	ii) It can be used again by simply switching it back on.