Class 7 Exam > Class 7 Videos > Application of Electromagnet:An Electric Bell
Application of Electromagnet:An Electric Bell Video Lecture - Class 7
FAQs on Application of Electromagnet:An Electric Bell Video Lecture - Class 7
| 1. What is an electric bell and how does it work? |  |
Ans. An electric bell is a device that uses an electromagnet to produce a ringing sound. It consists of a coil of wire wrapped around an iron core, called an electromagnet. When an electric current passes through the coil, it generates a magnetic field which attracts a metal strip, called an armature. This causes the armature to strike a metal gong, producing a ringing sound.
| 2. How is an electric bell connected in a circuit? | |
Ans. An electric bell is connected in a circuit by placing it in series with a power source (such as a battery) and a switch. The circuit is completed when the switch is closed, allowing the electric current to flow through the coil of the electromagnet. This current creates a magnetic field that activates the bell mechanism.
| 3. What are the applications of an electric bell? | |
Ans. Electric bells have various applications, including:
- Doorbells: Electric bells are commonly used in doorbell systems to notify occupants of visitors.
- School bells: Electric bells are used in schools to signal the start and end of classes.
- Fire alarms: Electric bells are often used in fire alarm systems to alert people during emergencies.
- Telephone systems: Electric bells were historically used in telephone systems to indicate incoming calls.
- Industrial signaling: Electric bells are used in industrial settings to signal shift changes, break times, or other important notifications.
| 4. How does the electromagnet in an electric bell work? | |
Ans. The electromagnet in an electric bell works by converting electrical energy into magnetic energy. When an electric current flows through the coil of wire wrapped around the iron core, it generates a magnetic field. This magnetic field attracts the armature, causing it to strike the gong and produce sound. When the current is turned off, the magnetic field disappears, and the armature returns to its original position due to a spring, stopping the ringing sound.
| 5. Can an electric bell work without electricity? | |
Ans. No, an electric bell cannot work without electricity. The functioning of an electric bell relies on the flow of electric current through the coil of the electromagnet. Without electricity, there would be no magnetic field generated, and the bell mechanism would not be activated to produce sound.
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