Topics
Physical Quantities and Measurement
- Measurements
- Physical Quantities
- Volume and It’s Unit
- Measurement of Volume
- Area and It’s Unit
- Measurement of Area
- Density and It’s Unit
- Measurement of Density
- Determination of Density of a Regular Solid
- Determination of Density of an Irregular Solid
- Determination of Density of a Liquid
- Speed
Force and Pressure: Motion
Energy
- Energy
- Forms of Energy
- Mechanical Energy
- Potential Energy (U)
- Kinetic Energy (K)
- Types of Kinetic Energy
- Conversion of Potential Energy into Kinetic Energy
- Transformation of Energy
- Conservation of Energy
- Hydroelectric Energy
Light Energy
- Light
- Reflection of Light
- Plane Mirror
- Terms Used in Reflection of Light
- Law of Reflection of Light
- Verification of the Law of Reflection of Light
- Reflection of a Ray of Light Normally Incident on a Plane Mirror
- Images Formed by a Plane Mirrors
- Formation of Image by Reflection: Real and Virtual Image
- Lateral Inversion
- Types of Reflection
- Speed of Light
- Colour
Heat
- Heat and Its Unit
- Heat Exchange
- The Temperature and a Thermometer
- Measuring Temperature
- Scales of Thermometers
- Effects of Heat
- Expansion of Substances (Thermal Expansion)
- Expansion of Solids
- Expansion of Liquids
- Expansion of Gases
- Transfer of Heat
- Conduction
- Convection
- Radiation
- Conductors and Insulators
- Thermos Flask (Dewar Flask)
Sound
Electricity and Magnetism
- Magnet
- Discovery of Magnets
- Classification of Magnets
- Magnetic Properties
- Laws of Magnetism
- Magnetic Field
- Electromagnet
- Making of an Electromagnet
- Applications of Electromagnets
- Electric Bell
- Earth’s Magnetic Declination
- Electricity
- Sources of Electricity
- Electric Circuit
- Conductors and Insulators
- Analogy of Electric Current with Water Flow
- Flow of Charges (Electrons) Between Conductor
- Symbols and Functions of Various Components of an Electric Circuits
- Types of Circuits: Series Circuit
- Types of Circuits: Parallel Circuit
- Electric cell
- Battery
- Electric Bell and its Component
- Working of Electric Bell
Electric Bell and its Component:
An electric bell is a common device used for doorbells, and it operates using an electromagnet.
Electric bell
Components:
- Electromagnet: A coil of copper wire wound around an iron piece.
- Iron Strip and Striker: An iron strip is attached to a striker, which hits the gong to produce sound.
- Contact Screw: This screw touches the iron strip and helps complete the electric circuit.
Working of Electric Bell:
- When the bell button is pressed, the electric circuit is closed, and current flows through the coil, turning it into an electromagnet.
- The electromagnet attracts the iron strip, pulling it towards the coil. As a result, the striker attached to the iron strip hits the gong, creating a sound.
- As the iron strip moves, it loses contact with the contact screw, breaking the circuit and stopping the current.
- With no current, the electromagnet loses its magnetism, and the iron strip returns to its original position, coming back in contact with the contact screw.
- This action completes the circuit again, allowing the current to flow. The process repeats, making the bell ring continuously as long as the button is pressed.
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