short Answer Type Questions
2. What are CFLS ? Why are CFLs preferred over electric bulbs ?
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3. Explain the construction of battery.
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4. What are MCBs ? How do they work?
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5. What happens when a compass needle is brought near to a current carrying wire ?
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Long Answer Type Questions
1. Explain the working of electric bell with diagram.
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2. What is an electromagnet ? Write its uses.
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Class 7
Answers
Answer:
2. CFL are compact flueroscent lamps. They are preffered over electric bulbs because:They work on chemical effect of electricity and not on heating effect of electricity. Thus they do not consume more energy as electric bulbs. Thus they are very cost efficient.
3. These batteries are constructed of several single cells connected in series each cell produces approximately 2.1 volts. ... A battery cell consists of two lead plates a positive plate covered with a paste of lead dioxide and a negative made of sponge lead, with an insulating material (separator) in between.
4. A Miniature Circuit Breaker is an electromechanical device designed to protect an electric circuit from over-current - A term to describe an electrical fault caused by either overload or short circuit. Back in the day we protected against over-current by using fuse wire
5. When a magnetic compass is brought near a current carrying wire, the compass needle gets deflected. ... When a magnetic compass is brought near a current carrying conductor the needle gets deflected because of the magnetic field produced by the current carryung conductor.
1. An electric bell is a mechanical or electronic bell that functions by means of an electromagnet. ... When an electric current flows through the coils, the electromagnet creates a magnetic field which pulls the armature towards it, causing the hammer to strike the
2. An electromagnet is a device that sends electricity through a coil of wire to produce a magnetic field. ... Electromagnets are used in millions of devices around the world, from hard disk drives and MRI machines, to motors and generators
Answer:
Answer 2
CFL are compact flueroscent lamps. They are preffered over electric bulbs because:They work on chemical effect of electricity and not on heating effect of electricity. Thus they do not consume more energy as electric bulbs. Thus they are very cost efficient.
Answer 3
These batteries are constructed of several single cells connected in series each cell produces approximately 2.1 volts. ... A battery cell consists of two lead plates a positive plate covered with a paste of lead dioxide and a negative made of sponge lead, with an insulating material (separator) in between.
Answer 4
A Miniature Circuit Breaker is an electromechanical device designed to protect an electric circuit from over-current - A term to describe an electrical fault caused by either overload or short circuit. Back in the day we protected against over-current by using fuse wire (indeed, we used to sell it!).
Answer 5
When a magnetic compass is brought near a current carrying wire, the compass needle gets deflected. ... When a magnetic compass is brought near a current carrying conductor the needle gets deflected because of the magnetic field produced by the current carryung conductor.
Long Question Answer
Answer 1
in the top
Answer 2
An electromagnet is a device that sends electricity through a coil of wire to produce a magnetic field. ... Electromagnets are used in millions of devices around the world, from hard disk drives and MRI machines, to motors and generators.
Explanation:
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