bulb, conductor, filament, insulator, electric cell, electric circuit, switch, terminal
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?
- Name a good conductor of electricity which is not a metal.
- Name the material that glows inside the bulb.
- How many terminals are there in a cell?
- Name some metals which are conductors.
- Name some conductors which are not metals.
- Define insulator.
- 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.
- What is a cell? Draw a diagram.
- What is electricity?
- What is the main function of a switch? Draw the symbol of a switch.
- What is an open circuit? Draw a diagram
- What do you understand by an electric circuit? Draw a labeled diagram of a closed electric circuit.
- What is the difference between an open circuit and closed circuit?
- What is a bulb? How does a bulb glow?
- Draw a labeled diagram of a electric torch.
- Explain how electric current flows in an electric circuit with a diagram.
- What is a conductor?
- Draw the symbol of a fuse, bulb, switch
- 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
- 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
- What are two places on a battery to which the wires can be attached called: a) switches b) filaments c) terminals d) insulators
- What is the source of electricity in the satellites: a) dry cells b) solar cells c) dynamos d) accumulators
- 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
- How is electricity produced by an electric cell?
- Why are electric wire, covered with rubber and plastic?
- Why are we advised not to touch electric appliances and switches with wet hands?
- Why is copper metal used to make electric wires and not any other material to make wires?
- 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?
- 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
- 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
- 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
- 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
- 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
- Why is copper not used as a filament: a) produces white light b) high melting point c) good conductor of current d) produces heat
- 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
- 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
- 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
- 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