Circuit of Electric Bell (2023)

The electric bell is one of the many devices we use in our day-to-day life. When we complete the simple circuit of the bell, it produces a sound. Also, the functioning of the bell depends on an electromagnet. Consequently, when the current flows, the magnetic field becomes active and the movement of the gong causes the bell to ring.

Read Also: Wave Nature of Electromagnetic Radiations

Table of Content

  1. Electric Bell
  2. Electromagnet
  3. Magnetic field
  4. Closed Circuit
  5. Open Circuit
  6. Circuit of an Electric Bell
  7. Working of Electric Bell
  8. Things To Remember
  9. Sample Questions

Key Takeaways:Electric Bell working, Electromagnet, Electromagnet working, Electricity and Magnetism, Magnetic field, closed-circuit, open circuit, electromagnetic core

Electric Bell

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An electric bell is a device that informs us when someone is waiting at our gate when they ring the bell. It is a simple electrical circuit that functions using an Electromagnetic.

Read More: Electrical Formula

Electromagnet

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Electromagnets are artificial magnets. Their magnetic properties depend on the flow of current through them.

  • When electric current passes through these metals, a magnetic field is generated around them. This magnetic field helps them act like permanent magnets.
  • However, as soon as the current is removed, the magnetic field stops and the metal loses its magnetic properties.
  • The simplest example of an electromagnet can be a wire wound in a coil or a wire wrapped around a magnet or soft iron. When current passes through this wire, it can start acting like an electromagnet.
  • The strength of this magnetic field depends on the number of turns in the coil and the current flowing through it. A greater number of turns or increased current, both create a stronger magnet.
Circuit of Electric Bell (1)

Check Important Notes for Electromagnetic Field

Magnetic Field

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  • Magnetic fields are vector fields that show the movement of the electric charges and currents in and around a magnet when under some magnetic influence.
  • Such charges generally experience a force that is perpendicular to the original direction of their movement.
  • The effect of a magnetic field at different points of a magnet can be observed by moving a magnet around a compass and noting the change in direction to which the compass was pointing.
  • To see the magnetic fields clearly you can perform a simple experiment. Place a thin glass sheet on a bar magnet and sprinkle some iron fillings on it. The fillings will arrange themselves along the magnetic field of the bar magnet and you can observe them carefully.

Circuit of Electric Bell (2)

Magnetic Field

Check Also: Permanent Magnets and Electromagnets

Closed Circuit

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An electric circuit that is properly connected at all points and that allows the current to flow through it is called a closed circuit.

Open Circuit

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An electric circuit that breaks at some point and that current cannot flow through is called an open circuit.

Circuit of Electric Bell (3)

Check More: Electromagnetic Radiation

Circuit of an Electric Bell

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When the circuit of an Electric bell is complete the current in the circuit activates the electromagnet that attracts the ging that hits the bell to ring it.

The different parts of this circuit are:

  1. A U−shaped electromagnet facing an armature that is supported by a spring.
  2. The spring is connected to an adjustable screw.
  3. The armature and an iron hammer form the system that hits the gong. This hammer is allowed a to and fro movement according to the circuit.
  4. In a normal position, when the circuit is open, the armature is in constant contact with the screw.
  5. There are two terminals on either side of the battery. One of the terminals connects the coil to the spring. The other terminal connects the battery to the spring through the adjustable screw.
Circuit of Electric Bell (4)

Read Further: Ampere’s Circuital Law

Working of the Electric Bell

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  1. When the switch is turned on, current flows through the circuit and the electromagnet.
  2. As the current moves through the electromagnet, it gets magnetized. Consequently, it attracts the armature.
  3. Following this, the hammer strikes the gong and produces the signature sound.
  4. When the hammer moved, the contact between the attached screw and spring breaks.
  5. Subsequently, the circuit once again becomes an open circuit.
  6. Thus, the flow of current through the circuit stops and the electromagnet gets demagnetized.
  7. Following this, the armature restores its position through the spring.
  8. Hence, the armature contacts the adjustable screw once again.
  9. Finally, the circuit is back to its original position to repeat the work when the switch is pressed again.

Things to Remember

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  • An electric bell is a simple electrical circuit that functions using an Electromagnetic to inform us when someone is waiting outside our gate.
  • Electromagnets are artificial magnets that become magnetized when electric current flows through them.
  • Magnetic fields are vector fields that show the extent of the magnetic influence of the metal.
  • A connected electric circuit that allows current to flow through it is called a closed circuit.
  • A disconnected electric circuit that does not allow current to flow through it is called an open circuit.
  • The different parts of this circuit are a battery, switch, terminals, adjustable screw, armature, metallic strip, electromagnet, hammer and a gong.
  • When the circuit of an Electric bell is complete the current in the circuit activates the electromagnet that attracts the ging that hits the bell to ring it.

Check Further: Electromagnetic Spectrum

Sample Questions

Ques: Name two devices that use the magnetic effects of current to work.

Ans: There are two common devices that use the magnetic effects of electric current. These devices are a loudspeaker and an electric bell. Many loudspeakers follow the electromagnetic principle. In this device, when a time-varying current flows through the voice coil moves, it moves within the gap between a permanent magnet. An electric bell is a simple electrical circuit that uses an electromagnet to form sound.

Ques: What is an electromagnet? What are its different uses?

Ans:An electromagnet is usually a soft iron piece that is converted into a magnet when we pass some current through the coil wound around the iron piece.

Electromagnets are used in the functioning of motors and generators.

Ques: What are the magnetic effects of Electric current?

Ans:Magnetic effects of Electric current are called electromagnetic effects. This refers to the effect in which when an electric current passes through a wire coil, it acts as a magnet. This is generally observed in an electromagnet that is a soft iron rod with a wire wrapped around it.

Ques: Explain the construction of an electric bell.

Ans:The different parts of this circuit are an electromagnet facing an armature that is supported by a spring which is further connected to an adjustable screw. The armature and an iron hammer form the system that hits the gong. When the circuit is open, the armature is in constant contact with the screw. There are two terminals on either side of the battery. One of the terminals connects the coil to the spring. The other terminal connects the battery to the spring through the adjustable screw.

Ques: What is an electric circuit?

Ans:An electric circuit is a connection of wires and electrical elements that provides a closed path so that electricity can pass between the two terminals of an electric cell. The bulb attached to the circuit glows only when current flows through the circuit. The bulb is attached to the circuit mainly to check and confirm the flow of current in the circuit.

Ques: Name one method that can be used to check the direction of the magnetic field in a current flowing wire.

Ans:Maxwell’s corkscrew rule also known as the right-hand thumb rule illustrates the direction of the flow of the magnetic field associated with any straight current-carrying conductor. It states that “Imagine that you are holding a current-carrying straight conductor in your right hand with your thumb pointing in the direction of the flow of current. Now, your fingers should wrap around the straight conductor in such a way that it matches the direction of the flow of the magnetic field lines.”

Ques: Why soft iron preferred over other metals for the core of an electromagnet?

Ans:The soft iron bar is used for a core because it is a metal that acquires magnetic properties when an electric current flows through the solenoid. Also, it loses these magnetic properties as soon as the flow of current stops. Further, it is ferromagnet and hence acquires these magnetic properties easily and can retain them for a longer time.

Ques: How can you create an electromagnet?

Ans:Anyone can create an Electromagnet by wrapping a wire around an iron nail and then allowing current to flow through the wire. The electric field produced in the wire coiled around the nail produces a magnetic field around the nail. In some cases, depending on the intensity of current and number of coils, the nail can remain magnetised even when it is removed from within the wire coil.

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AC Voltage Applied to a Capacitor AC Voltage Applied to a Resistor
AC Voltage Applied to a Series LCR Circuit AC Voltage Applied to an Inductor
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