How one can say about a device (e.g: a light holder contains 20 or 30 L.E.Ds which glows when power supply is off, from which source they are getting the supply..... battery or capacitor) without removing and opening up its case ?
How one can check the charger of the mobile phone or any other charger .......... that is it working ? if , working is it delivering the required supply which is needed by the battery to charge properly ?4 6306
although ckt breakers have taken the place of old fuse. But instead of it , these older ones are still used in the industries and homes ? why .... what are their advantages and disadvantages ? which one is leading and winning the race and competition ?641
which type of A.C motor is used in the fan (ceiling fan, exhaust fan, padestal fan, bracket fan etc) which are find in the houses ?25 52862
what are fluorescent lamps (fluorescent fixtures) & what are incandescen lamps (incandescents fixtures) ? differences between these two ?1 765
how one can know the charging time, discharging time of a 12 VDC battery ? If i have a battery of 12 VDC , 4.0 AH , how long will it take to charge from a charger (power supply) of input 220 V , Output 15 V and output current of 3000 mA and how long will it take to discharge whether using or not ? How much backup will it give ?
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 9027
what are the differences between 'exhaust fan', 'heavy-duty exhaust fan' & 'super heavy duty exhaust fan'. what are their power ratings ?
whats the one main difference between UPS & inverter ? And electrical engineering & electronics engineering ?16 12585
What is the difference b/w Earthing and Grounding?4 4621
why dc current is supplied in america rather than ac1 3038
can any one suggest websites having study maetrials for the electrical students?1 680
what is the order of mgnetiation current in a current transformer of 1000A/1A ratio?2 3030
generally on the roadside v hav 11kv line which is being step down to 440v line to line....so any1 can tell me which type of transformer they r using whether it is star to delta,delta to star etc...???9 8507
In DC generator, we use commutator, having no. of segments. Then how it is possible to get a half wave of voltage and current for half rotation of armature?
please send me last 5 year interview questions
how to calculate cable size in diffrent loads?
WHAT ARE THE DATAS REQUIRED FOR PROTECTION AND METERING AND CONTROL AND LOGIC PREPARATION,HOW TO STUDY THE PROTECTION AND METERING?
how we calculate torque ? how we improve it ?where torque will either motor or generator ?
What is the implications when 600 hp motor is started when the unit is running with Transformer of capacity 1500 KVA and DG set of 1000kva
how to calculate current and voltage in a same circuit?
how to calculate power consumption in slip ring motor at different step
How can we calculate C10 rating of a bttery from c5 or c20 ratings??
How you calculate the repturing capacity of a HRC fuse
how much flux density of CRNO core
3ph motor running with unequal kw and different pf what are the reasons
what is the difference between earthing and unearth
what should be the acceptrd value of winding resistance for 2.5MVA transformer
what is draiv work