D. Very Short Answer Questions :
1. Name a very thin wire made of a special material which glows in a bulb.
2. Name a device used to open or close an electric circuit.
3. Name a safety device used to prevent an overflow of electric current.
4. Identify this symbol 7.
5. Name the device used in place of fuse these days.
6. Name a gadget that is a direct application of an electromagnet.
7. Mention the device when many cells are connected together.
8. Name a gadget in which electromagnet is used.
Answers
Answer:
1) Tungsten
2)key or switch
3)fuse
4)
5)Miniature Circuit Breaker (MCB).
6)Electromagnets are widely used as components of electrical devices such as motors, generators, loudspeakers, hard disks, MRI machines, scientific instruments, etc.
7) Battery
8loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment.
Answer:
Ans 1:
filament
(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.
Ans 2. switches
A device designed to open or close a circuit under controlled conditions is called a switch. The terms “open” and “closed” refer to switches as well as entire circuits. An open switch is one without continuity: current cannot flow through it.
Ans 3Fuse wire
Fuse wire is a safety device which is used to limit the current in an electrical circuit.
Ans 5 The name of device is Miniature Circuit Breaker (MCB).
Ans 6 Electromagnets are widely used as components of electrical devices such as motors, generators, loudspeakers, hard disks, MRI machines, scientific instruments, etc.
Ans 7 Such a combination of two or more cells is called a battery. Many devices such as torches, transistors, toys, TV remote controls, use batteries
Ans 8 Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment.
Hope it helps you
sorry for answer : 4 .
I couldn't find it