Select Page

Subject:

science-physics

Class:

class VI

Key Concepts

bulb, conductor, filament, insulator, electric cell, electric circuit, switch, terminal

essential questions

1. How does an electric circuit work?
2. How does energy travel along a circuit?
3. What makes a circuit and what are different ways circuits can be made?
4. Why must all circuits power something to be considered a complete circuit?
5. What is electricity?
6. What are electric charge, current, voltage and power and how are they related?
7. Will current flow through an open ( disconnected) circuit? Why or why not?
8. Where do we find electric circuits in our lives?

Remembering:

  1. Name a good conductor of electricity which is not a metal.
  2. Name the material that glows inside the bulb.
  3. How many terminals are there in a cell?
  4. Name some metals which are conductors.
  5. Name some conductors which are not metals.
  6. Define insulator.
  7. Fill in the blanks:  1. In electric bells electric energy transforms into ____ energy.  2. ____ is the positive terminal of an electric cell.    3. The tiny coiled metal wire present inside the bulb is called___  4. A combination of two or more electric cells is called___.  5. An electric bulb has___ terminals.  6. ___ is an electric device which easily closes or opens an electric circuit . 7. A material which does not allow the electricity to pass through it is_____. 8. Non metals like___ and ___ are conductors of electricity.   9. A material which allows electricity to pass through it is____.  10.  A complete electric circuit is called____ electric circuit.

understanding:

  1. What is a cell? Draw a diagram.
  2. What is electricity?
  3. What is the main function of a switch? Draw the symbol of a switch.
  4. What is an open circuit? Draw a diagram
  5. What do you understand by an electric circuit? Draw a labeled diagram of a closed electric circuit.
  6. What is the difference between an open circuit and closed circuit?
  7. What is a bulb? How does a bulb glow?
  8. Draw a labeled diagram of a electric torch.
  9. Explain how electric current flows in an electric circuit with a diagram.
  10. What is a conductor?
  11. Draw the symbol of a fuse,  bulb, switch

MCQ

  1. If we touch a live wire carrying current, we get a shock. This is because our body is a/ an   a) conductor of electricity  b) insulator of electricity  c) source of electricity  d) both b and c
  2. Which  of the following statements is true: a) electricity can be created   b) electricity flows in a circuit with gaps  c) a cell converts chemical energy to electrical energy  d) a cell consists of three terminals
  3. What are two places on a battery to which the wires can be attached called: a) switches  b) filaments  c) terminals  d) insulators
  4. What is the source of electricity in the satellites: a) dry cells  b) solar cells  c) dynamos  d)  accumulators
  5. Identify the symbols of electrical components used in the construction of the given electric circuit:   a) X= switch   Y= cell  Z= bulb    b) X= bulb  Y= Battery  Z= cell   c) X= bulb  Y= battery Z= switch  d) X= cell  Y= Switch  Z= battery

 

Application:

  1. How is electricity produced by an electric cell?
  2. Why are electric wire, covered with rubber and plastic?
  3. Why are we advised not to touch electric appliances and switches with wet hands?
  4. Why is copper metal used to make electric wires  and not any other material to make wires?
  5. Two bulbs are connected to a cell as shown in the figure. Bulb P got fused. What will happen to bulb Q when the circuit is closed?

MCQ

  1. Most of the electricity carrying wires along the roads do not have a plastic covering like the wires used at homes. But why is there no substantial loss of energy: a) air is not affected by gravity   b) air is a bad conductor of electricity  c) electricity flows very fast near highways  d) current rating is high near highways
  2. Electric heaters used for cooking have a filament or a heating coil placed on a plate made up of clay as shown in the picture Why is it so:  1. It is a bad conductor of heat   2. It is bad conductor of electricity  3. It is porous  a) Only 1 and 2   b) Only 2 and 3   c) only 1 and 3  d) all 1, 2 and 3
  3. Why is a switch used in a circuit? a) to save energy  b) to complete or break a circuit  c) to prevent electric shock  d) to make the bulb glow easily
  4. Which of the following energy conversions take place in a torch:  a) electrical→ chemical→ light  b) chemical→ electrical→ light  c) electrical → light→ chemical  d) light→ chemical→ electrical
  5. In which of the these circuits will the bulb or bulbs glow the brightest: a) simple circuit with one bulb and one cell  b)simple circuit with one bulb and two cells  c) a simple circuits with two bulbs and one cell  d) a simple circuit with two  bulbs and two cells
  6. Why is copper not used as a filament: a) produces white light  b) high melting point  c)  good conductor of current  d) produces heat
  7. Which of these are good electrical insulators: a) graphite, wood, rubber  b) rubber, glass and wood  c) pure water, wood, silver   d) copper, iron , silver

Analysis:

  1. Identify the circuit diagram in which the bulb does NOT light up.  a)  only a and b    b) only a and c   c) only c and b   d) all three a, b and c
  2. Neha connected two bulbs across two cells in a simple circuit. What should Neha do to make the blubs glow dimmer:  a) replace on cell with a piece of wire   b) replace one cell with with another piece of wire  c) replace one bulb with a piece of wire   d) replace one bulb with another cell
  3. The figure shows an electric circuit made up of a battery and a bulb. Which of the following is the right sequence of flow of current. a) X→ Y→Z    b)  Z→Y→X    c) Z→X→Y   d) Y→Z→X

Evaluation:

Create: