pls help me tomorrow is my exam pls ques.3 both parts pls help expert
Answers
♥Q3.♥
♥a)♥
Chances are high that you have an electric geyser at home, to heat up water. ... The principle on which the geyser works is simply the conversion of electrical energy into heat through the use of heating elements to raise the temperature of water through conduction of the heat to the water.
♥b)♥
A fuse is a safety device consisting of a strip of wire that melts and breaks an Electric circuit if the current exceeds the safe value.
Features of a fuse are:-
♥It should have low melting point.
♥It should have low ohmic losses.
♥It should have high conductivity. ( or low resistivity)
♥It should be economical.
♥It should be free from detraction.
♥Q4.♥
♥Overload is a condition when current is higher than system/ equipment nominal rated current. The flow of current is occurring through intended path. An equipment can bear temporary overload situation depending upon its design. ( e.g. if a motor is designed for rated current of 100A, it can bear temporary overload situation of say 105A). Overload if not cleared within time may result short circuit condition.
♥Short circuit is a condition when current flows through unintended path. Current magnitude is very high (depending upon system configuration like type of earthing etc) Such conditions are very severe for electrical systems. It should be detected and cleared as soon as possible to minimize damage.
(In most of the cases short circuit is a result of breakdown of insulations of equipment or when one phase comes in contact with another ).
♥Q5.♥
MCB : miniature circuit breaker.
CFL : compact fluorescent light.
ISI : Indian standard institute.
Hope this helps you !
~Keerthana