Question

Chapter 14 electric current and it's effects extra questions class 7

Answer 1

Answer:

Explanation:

WHICH THE TEXT OR THE EXTRA Q FROM OTHER BOOK

Answer 2

Answer:

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Q => what is heating effect of current

Ans => when an electric current passes through a wire it gets heated up this is known as heating effect of current.

Q => What did joule think about heat and current

Ans => According to joule , heat produced in a current carrying wire depends upon the strength of electric current resistance off the wire and the time for which electric current flows through the wire.

Q => what is the meaning of electric fuse

Ans => Electric fuse is the safety device used to prevent electric fire due to short circuit or overloading. it works on the principle of heating effect of current.

Q => what is called magnetic effect of current

Ans => when an electric current flows through a wire it behaves like a magnet. this is known as the magnetic effect of current.

Q => which material can be used for makeup and electromagnet

Ans => A current carrying coil of an insulated wire wrapped on a cylindrical Core makeup an electromagnet.

Q => define and full form of MCB

Ans => miniature circuit breaker and automatic switch now often use as a replacement for an electric fuse.