Why is back emf used for a DC motor? Highlight its significance.

693

when ac current flows thru d coil of a contactr,it energizes,magnetic field attracts d contact of the coil...nw wont dt ac current in d contct induce current back on to d coil thru mutual inductance leading to high currnt in d coil

1255

How to calculate earth wire load by formula

1956

what is the difference between 4pole & 6pole DC Motors & give advantage ?

1416

how to calculate the capacitor to maintain power factor?

1654

Why do we need interlocking in a HT metering or Ring main unit switchgear?

1551

send me any model test paper of clerical post of state bank of india.......

1372

what is POTT and PUTT explain?

2802

How to calculate Air conditioning capacity for a telecom BTS shelter?

3034

what are the applications of transistors with low dc gain, high dc gain and medium dc gain( beta)?

1292

what is the role of energy meter in distribution system ?

663

Does magnetomonopoles exists? one maxwell equation strongly suggests no, but how about their existance in plasma?

1466

Draw the line diagram of diffretial relay connected to transformer?

1960

Is there any reason that we get shock on touching phase wire because the earth is at neutral potential? Is there any reason that the earth is at neutral potential because the neutral is earthed in apower station

1543

what happen if field of dc shunt motor opens? what is function of putting res. in parallel to one phase of 3 phase IM? the power supplied by 5A source in circuit is given by------Watt.

1546