CHAPTER:ELECTRIC CURRENTS & CIRCUITS
Q#1:Why do we prefer to use CFLs instead of bulb?
Q#2:What is the benefit of using electric fuse in an electric circuit?
Q#3:Identify the instrument and mention its use.
Q#4:List some uses of electromagnets.
Answers
Answer:
ANSWER 1
CFLs are up to four times more efficient than incandescent bulbs. You can replace a 100-watt incandescent bulb with a 22-watt CFL and get the same amount of light. CFLs use 50- to 80-percent less energy than incandescent lights. ... Three-way CFLs and CFLs that work with dimmers are also available
ANSWER 2
It is the cheapest form of protection, and it does need any maintenance. Its operation is completely automatic and requires less time as compared to circuit breakers. The smaller sizes of fuse element impose a current limiting effect under short-circuit conditions.
ANSWER 3
A compass is an instrument used for navigation and orientation that shows direction relative to the geographic cardinal directions (or points). Usually, a diagram called a compass rose shows the directions north, south, east, and west on the compass face as abbreviated initials.
ANSWER 4
Electromagnets are very widely used in electric and electromechanical devices, including:
Motors and generators.
Transformers.
Pickups.
Relays.
Electric bells and buzzers.
Loudspeakers and headphones.
Actuators such as valves.
Magnetic recording and data storage equipment: tape recorders, VCRs, hard disks.
Explanation:
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