When an electric current flows through a wire it behaves like a magnet?
When an electric current flows through a wire, it behaves like a magnet. „ A current carrying coil of an insulated wire wrapped around a piece of iron is called an electromagnet. The electromagnets are also used to separate magnetic material from the junk.
When an electric current flows through a copper wire AB as shown in Figure the wire a deflects a magnetic needle placed near it B becomes red hot C gives electric shock d behaves like a fuse?
The answer is (a) deflects a magnetic needle placed near it. Explanation: A current-carrying wire acts as a magnet with a magnetic field around it, the strength of which depends upon the amount of current passing through it.
Why is an electric fuse required in all electrical appliances Class 7?
Electric fuse is required in all electrical appliances to prevent damage from excessive current flow and during short circuit.
What type of electric fuse is used in individual electrical appliances?
1 Answer. Cartridge fuse. It consists of a glass tube T having a thin fuse wire sealed inside it. The glass tube has two metal caps at its two ends.
Can a copper wire be used as a fuse wire give reason?
No, we cannot use copper wire as fuse wire because the melting point of copper is higher and resistance is low and hence, current can flow through it without melting it or breaking the circuit and it can’t be limited.
Do you think all electrical fuses should have the same maximum current?
No. The reason is that all different fuses depend on different voltage flux.
Can we use the same fuse in a geyser and television set?
No,we cannot use the same fuse in a geyser and a television set as the electricity rate required by both is different. A geyser needs more electricity than a television set as it uses electricity to heat water while a television set needs electricity to put pixels on the screen.
What is the main disadvantage of an electric fuse?
Disadvantage: During short circuit or overload once fuse blows off replacing of fuse takes time. During this period the circuit lost power. When fuses are connected in series it is difficult to discriminate the fuse unless the fuse has significant size difference.
Why is MCB preferred over fuse?
MCBs are more sensitive to current than fuses. They immediately detect any abnormality and switch off the electrical circuit automatically. This prevents any permanent damage to electrical appliances and human beings. The MCB detects any excess current and breaks the circuit.
What we are using in the place of electric fuse?
The name of device is Miniature Circuit Breaker (MCB).
What is electric fuse very short answer?
Electric fuse is a safety device used to limit the current in an electric circuit which melts and breaks the circuit whenever there is an excess flow of current through the circuit.