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Question
Give reasons for the following.
(a) An electric current does not flow in a circuit when the switch in the in the circuit is 'open'.
(b) The wire in an electric fuse is made of a material that melts easily.
(c) An electric bulb feels hot to touch after it has been on for some time.
(d) A magnetic needle gets deflected when it is brought close to a current carrying conductor.
(e) The soft strip of an electric bell gets attracted to the electromagnet when the electric ell is switched on.
(a) An electric current does not flow in a circuit when the switch in the in the circuit is 'open'.
(b) The wire in an electric fuse is made of a material that melts easily.
(c) An electric bulb feels hot to touch after it has been on for some time.
(d) A magnetic needle gets deflected when it is brought close to a current carrying conductor.
(e) The soft strip of an electric bell gets attracted to the electromagnet when the electric ell is switched on.
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Solution
- (a) When the switch is closed there will be continuity in the circuit which allows the electricity to pass through it, whereas when the switch is open, there will be a gap created in the circuit and hence electric current does not flow in the circuit.
(b) The wire in the electric fuse is designed in such a way that it allows only a certain amount of current to pass through it. When excess amount of electricity passes through it, the wire melts due to the heat, causing the circuit to break.
(c) The electric bulb contains a very thin wire called filament to conduct electricity. When an electric current flows through the bulb, the bulb glows and the filament carrying current gets heated. This happens due to the heating effect of electric current.
(d) When electric current flows through a conductor, the conductor carrying current behaves like a magnet. Hence it can deflect the magnetic needle kept close to it.
(e) When the switch is on, the current flows through the circuit, creating a magnetic field, which allows the electromagnet to pull the strip of iron. This makes the hammer attached to the iron piece hit the gong and ring the bell.
- (a) When the switch is closed there will be continuity in the circuit which allows the electricity to pass through it, whereas when the switch is open, there will be a gap created in the circuit and hence electric current does not flow in the circuit.
(b) The wire in the electric fuse is designed in such a way that it allows only a certain amount of current to pass through it. When excess amount of electricity passes through it, the wire melts due to the heat, causing the circuit to break.
(c) The electric bulb contains a very thin wire called filament to conduct electricity. When an electric current flows through the bulb, the bulb glows and the filament carrying current gets heated. This happens due to the heating effect of electric current.
(d) When electric current flows through a conductor, the conductor carrying current behaves like a magnet. Hence it can deflect the magnetic needle kept close to it.
(e) When the switch is on, the current flows through the circuit, creating a magnetic field, which allows the electromagnet to pull the strip of iron. This makes the hammer attached to the iron piece hit the gong and ring the bell.
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