hello! can anyone explain to me how a 3 speeds table fan work? what are the factors that are controlling the speed of a normal table fan? Is it by varying the voltage or changing the magnetic field? would appreciate your reply :) thx in advance.

2 Answers  

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what is the defination of electrical engineer.

33 Answers  

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why fuse not recomended to neutral

10 Answers  

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if we want to increase the back up time of an UPS what should we do ? if we want to decrease the charging time of a battery/batteries attached with the UPS what should we do ?

6 Answers  

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In domestic supply, when neutral touches earth the earth leakage trips. Does this mean that if the star (neutral) point of an alternator is earthed that power will flow to earth i.e. a direct short to earth?

1 Answers  

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what we happen if 400 kvar cpacitor banks are on in manual mode and there is no load on mains ??????????????

7 Answers   HCL, Reliance,

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When a single pase capacitor run motor- run on 230vac and Case(1)run with 8 Mfd 250 vac.capacitor , Case( 2) run with 8 Mfd 400vac capacitor. What is difference between both case regarding power ,efficiency etc?

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How will I know that how many batteries I should connect to my UPS unit?

3 Answers  

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how to calculate the bus-bar size. give formula with description

1 Answers  

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how much winding resistance of 0.75kw to 12.5kw 3ph sqwiralcage induction motor?

0 Answers  

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why root three is used and how its comes in three phase power system?

1 Answers   IEEE,

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How to maintaine ht motor efficiancy

1 Answers  

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