Choose the true and false statements from the following:
1. It is convenient to represent electric components by symbols.
2. A connecting wire is symbolized by a zig-zag line in the circuit diagram.
3. When an electric current flows through a wire, the wire gets heated.
4. The key or switch can be placed anywhere in the circuit.
5. The amount of heat produced in a wire depends on its material, length and thickness.
6. CFLs consume more electricity than ordinary bulbs.
7. For different requirements, the wire of different materials, different length and thicknesses are used.
8. A fuse is used to save energy in electrical circuits.
9. MCBs are the switches which automatically turn off when current in a circuit exceeds the safe limit.
10. When an electric current flows through a wire, it behaves like a magnet.
1. It is convenient to represent electric components by symbols.
Ans- True.
2. A connecting wire is symbolized by a zig-zag line in the circuit diagram.
Ans- False.
3. When an electric current flows through a wire, the wire gets heated.
Ans- True.
4. The key or switch can be placed anywhere in the circuit.
Ans- True.
5. The amount of heat produced in a wire depends on its material, length and thickness.
Ans- True.
6. CFLs consume more electricity than ordinary bulbs.
Ans- False.
7. For different requirements, the wire of different materials, different length and thicknesses are used.
Ans- True.
8. A fuse is used to save energy in electrical circuits.
Ans- False.
9. MCBs are the switches which automatically turn off when current in a circuit exceeds the safe limit.
Ans- True.
10. When an electric current flows through a wire, it behaves like a magnet.
Ans- True.
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- Fill in the blanks:1. Our body is a ………………….. of electricity. 2. An electric cell produces electricity from the ………………….. in it. 3. In an electric circuit a fuse is a ………………….. to prevent possible fire. 4. A combination of two or more cells is called a ………………….. . 5. The coil of wire in an electric heater is called an ………………….. . 6. A ………………….. is a safety device which prevents damages to electrical circuits and possible fires. 7. The wire gets ………………….. when an electric current passes through it. 8. We must look for ………………….. mark on electrical appliances. 9. When electric current passes through a wire, it behaves like a magnet. It is the ………………….. effect of current. 10. Crane has a strong ………………….. attached to it.
- When an electric current flows through a copper wire AB as shown in figure, the wire$(a)$. deflects a magnetic needle placed near it$(b)$. becomes red hot$(c)$. gives electric shock$(d)$. behaves like a fuse"
- A charge of 150 coulomb flows through a wire in one minute. Find the electric current flowing through it.
- In the kicking wire experiment, the current carrying wire gets deflected due to the magnetic field of the horse shoe magnet.\nIs the deflection in the wire due to the fact that a current carrying conductor behaves as a bar magnet when current is passed through it ?
- When does a wire in an electric circuit generate a magnetic field?
- A current of 5 amperes flows through a wire whose ends are at a potential difference of 3 volts. Calculate the resistance of the wire.
- Which one of the following statements is not true?(a) In a house circuit, lamps are used in parallel. (b) Switches, fuses, and circuit breakers should be placed in the neutral wire (c) An electric iron has its earth wire connected to the metal case to prevent the user receiving a shock (d) When connecting a three-core cable to a 13 A three-pin plug, the red wire goes to the live pin.
- When an electric current is passed through any wire, a magnetic field is produced around it. Then why an electric iron connecting cable does not attract nearby iron objects when electric current is switched on through it?
- Choose the statement which is not correct in the case of an electric fuse.$(a)$. Fuses are inserted in electric circuits of all buildings$(b)$. There is a maximum limit on the current which can safely flow through the electric circuits$(c)$. There is a minimum limit on the current which can safely flow in the electric circuits$(d)$. If a proper fuse is inserted in a circuit it will blow off if current exceeds the safe limit
- a) What is an electric current? What makes an electric current flow in a wire?b) Define the unit of electric current(or Define Ampere).
- State whether the following statements are true of false:(a) A wire with a green insulation is usually the live wire. (b) A miniature circuit breaker (MCB) works on the heating effect of current.
- Explain the importance of using in a household electric circuit (i) fuse, and (ii) earthing wire.
- A thick wire is hanging from a wooden table. An anticlockwise magnetic field is to be produced around the wire by passing current through this wire by using a battery. Which terminal of the battery should be connected to the:(a) top end of wire? (b) bottom end of wire? Give reason for your choice.
- Why does one remove the plastic coating of the electrical wire from the ends, before connecting it to the electric circuit?
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