Tag: electric bell

Questions Related to electric bell

An electric bell has a resistance of $5 \Omega$ and requires a current of $0.25\ A$ to work it. Assuming that the resistance of the bell wire is $1 \Omega$ per $15m$ and that the bell push is $90m$ distance from the bell. How many cells each of emf $1.4V$ and internal resistance $2 \Omega$, will be required to work the circuit.

physics electric current and its effects electric bell the magnetic effect of a current current electricity and magnetism

  1. $3$

  2. $4$

  3. $5$

  4. $Can't\ be\ determined$

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Correct Option: C

Name one device that uses an electromagnet.

physics electric current and its effects electric bell the magnetic effect of a current current electricity and magnetism

  1. Electric bell

  2. Barometer

  3. Lactometer

  4. All the above

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Correct Option: A

What material is used for making the armature of an electric bell ? Give a reason for using this material.

physics current electricity and magnetism electric bell the magnetic effect of a current electromagnetic forces oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

  1. Soft Iron

  2. Carbon

  3. Glass

  4. Silicon

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Correct Option: A
Explanation:

Soft iron is used for making the armature of an electric bell because soft iron is magnetised easily on passing the current and completely demagnetised easily on withdrawing the current through the solenoid.

Working of electric bells is an example of

physics current electricity and magnetism electric bell the magnetic effect of a current electromagnetic forces oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

  1. Mechanical effect of electric current

  2. Heating effect of electric current

  3. Magnetic effect of electric current

  4. None of these

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Correct Option: C
Explanation:

An electric bell contains an electromagnet, consisting of coils of insulated wire wound round iron rods. When an electric current flows through the coils, the rods become magnetic and attract a piece of iron attached to a clapper. The clapper hits the bell and makes it ring.

Electric door bell employs

physics current electricity and magnetism electric bell the magnetic effect of a current electromagnetic forces oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

  1. Permanent Magnet

  2. Electromagnet

  3. Thermistor

  4. Electric bulb

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Correct Option: B
Explanation:

Striker is moved under influence of electromagnet when circuit is complete.

When the switch of an electric bell is pushed.

physics current electricity and magnetism electric bell the magnetic effect of a current electromagnetic forces oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

  1. Flow of the current stops through the electromagnet in the bell

  2. Current starts to flow through the electromagnet

  3. Voltage decreases in the current flowing through the electromagnet

  4. None of the above

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Correct Option: B
Explanation:

When the switch of electric bell is pushed,circuit completes and current flows leading an electromagnet to attract armature and ring the bell.

Which of the following is not a component of electric bell?

physics current electricity and magnetism electric bell the magnetic effect of a current electromagnetic forces oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

  1. Gong

  2. Ferromagnetic strip

  3. Low magnetic field permanent magnet to attract ferromagnetic strip

  4. None of the above

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Correct Option: C
Explanation:

Electric bell works on the mechanism of electromagnets i.e, temporary magnets, and no permanent magnet is used.

Temporary magnet allows the ferromagnetic strip to return back to its initial state as switch is released.

Which of the following is a characteristic of a buzzer?

physics current electricity and magnetism electric bell the magnetic effect of a current electromagnetic forces oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

  1. It has different mechanism from electric bell.

  2. It has higher frequency of collision of gong and hammer

  3. It uses only AC power supply

  4. None of the above

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Correct Option: B
Explanation:

In a buzzer, the simplest sort of doorbell, an electromagnet is used to operate a self-interrupting circuit. You can see how this system works in the diagram below. Click and hold the doorbell button to see how the buzzer works. ... This breaks the doorbell circuit, which shuts off the electromagnet.characteristic of a buzzer It has higher frequency of collision of gong and hammer

Which power supply can be used in electric bell

physics current electricity and magnetism electric bell the magnetic effect of a current electromagnetic forces oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

  1. $AC$

  2. $DC$

  3. Can't be predicted 

  4. Both A and B

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Correct Option: D
Explanation:

Electric bell works on the mechanism of electromagnets and for this any type of power either AC or DC can be used.

When the switch of an electric bell is pushed

physics current electricity and magnetism electric bell the magnetic effect of a current electromagnetic forces oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

  1. Flow of the current stops through the electromagnet in the bell

  2. Current starts to flow through the electromagnet

  3. Voltage decreases in the current flowing through the electromagnet

  4. Circuit is closed in the electric bell

Show answer
Correct Option: B
Explanation:
When the switch of an electric bell is pushed, current start to flow through the electromagnet.
When switch is pushed , circuit is closed and current starts flowing through the electromagnet in bell & bell starts ringing.
OPTION : B.