Electric Current and Its Effects | Full Chapter Revision and Quiz | Class 7 Science

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[@Dynamicsrishtizzz]

Session was super duper interesting 😊🙏🙏
I have some doubts..
(1)if current doesn't flow through open circuit then how can we say that it's a circuit because current is not flowing ??
(2) Why we take small piece of wire having low melting point in place of fuse wire and not long piece?
(3) If current is not flowing through the iron nail then how is it behaving as a magnet?
I am Srishti Pathak..

[@crickzcreation18]

1) because it is still a circuit no matter it is closed or open
2) because long wire needs more space and short wire need less but both resistance is same so we use short wire to reduce space which will be occupied from a long wire and we use a wire that is has a low melting point because it prevents overloading as fuse doesn't
3)When current is passed through the coil using a battery and a key the iron piece behaves like a bar magnet as long as current is being passed.

[@21atikshasriv.5a2]

Srishti Pathak are you from PPSC mumbai

[@anubhavartgallary1724]

Only heating effect will be formed sir. We have switched off the supply of current hence no displacement or conduction current will be there the magnetic effect will not even last a second after it

[@geetharamini3958]

Thank you sir, but I had a doubt: the question at 38:33 did not have a switch, so the compass must not deflect. If I am wrong, please correct me.

[@shrivalisharma5794]

i think u meant battery. in 39:16 sir corrected it. Hope it helps

[@k.maheshkumar5174]

sir you did wrong
because there is no cell there is no current flows and it doesnt deflect

[@yasminrazviya8784]

37:56 Yes

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Sir please provide notes of this chapter

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31:9 😂

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31:09

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length of wire yes

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Op chapter

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2

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Miniature circuit breaker

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Current stops

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Light

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Electric cal

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B

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