Electrical Engineering

The opposition of a body or substance to current passing through it, resulting in a change of electrical energy into heat or another form of energy. So it could be any substance.

From 68.191.13.211. Now would someone out there add to what you have sen so far. Then we will all be more aware of the exact nature of the resistance.

Reverse any two of the lead wires at the motor junction box.

These are corrugated to increase the sensitivity of the pressure gauge.

Nowadays there's a much bigger difference in price based on quality and capabilities rather than type... the cheapest models of each are roughly comparable.

Lightning Impulse withstand test is a destructive test carried out on high voltage switchgear. It is classed as a destructive test as each shot damages the insulation and lays carbon tracks.

The Energy Networks Association Technical Specification (ENA-TS) 41-36 states the BIL (basic Impulse level) Required for the Voltage rating of the piece of switchgear rated up to 36kV.

For example an 11kV switchgear will have a BIL of 95kV.

Switchgear which include a Vacuum circuit breaker must have a second means of isolation, ie a disconnector. This disconnector can be a two position (mains on, off) or three position (mains on, off, or earth on) disconnector operated off load which is in series with the Circuit breaker.

To pass the test 15 shots at +95kV and 15 shots at -95kV are fired at all positions of the disconnector and only 2 out of the 15 (and not the last 5) shots can flash over to earth.

For example if the disconnector was in the off position one side will be connected to the impulse generator and the other side will be earthed. Positive and Negative shots will be fired and the impulse can not flash through the air gap to the earthed side of the disconnector.

This proves the isolation gap inside the disconnector has a BIL rating of 95kV.

Therefore if the incoming side of a switchboard is live and the outgoing side is isolated for maintenance. There can be a transient impulse on the live side of the circuit and it will not flash across the isolating gap and endanger anyone working on the dead side of the circuit

sine wave symbol

because when ever fault current occurs then the cable wont get damaged due to cable armored earthing to the gland for fault current to pass through groung

The reason you have to use two switches (a combination of start and stop push button) on PLC is because it is how the program is written.

10 HP is 7.46 kW theoretically, but allowing for an 0.7 power factor the kVA goes up to 10.5 kVA. Add 20% for sundry losses and you get 12.5 kVA

It is not. I did a project with it so I have some. Contact me @xmatthenryx

Larger transformers, such as power and distribution transformers, are filled with oil which acts to insulate and cool the transformer's windings. In order to allow the oil to expand and contract, a breathing vent is required. These breathers are normally vented through a chamber containing silica gel, which acts to dry any moisture-laden air when it enters the transformer.

Just like a transformer, the core losses are a combination of eddy current losses and hysteresis losses.

A capacitor and a resistor has no effect on the supply voltage; however, this particular load combination will cause the load current to lead the supply voltage by some angle termed the 'phase angle'.

The answer is: They are not. Whosoever told you that is off his meds. Alternatively, in some special applications there may be a reason for it. Many DC systems use a common ground where the loads are encased in the ground (like starter motors). Thus all breakers are positive, but some don't. If the loads don't care about polarity and the positive and ground are not common (like with a metal chassis), positive and negative is irrelevant.

total hour = 24*7 = 168 hrs

now 1 h.p. =0.750 kw

7.5h.p. =(?)

Hence = 5.625 kw

hence total unit = kw*hrs =5.625*168 =945kwh

NOw cost = unit/hrs *motor running hrs

=6 Rs for indust * 945

=5670 Rs

The 6013 Rod can be used on either ac or dc arc welders, at around 90-120 amps depending on your settings

Tucson Direct

No

Yes, a loose neutral wire can effect the operation of Earth Leakage Circuit Breaker.

I don't understand your question. Are you asking how to convert from 60hz to 25hz using a transformer? That cannot be done. Frequency in = frequency out.

A load or a resistance

You have to convert the peak voltage to an r.m.s. value, before inserting that value into the power equation.

Voltage x Current = Power

So Power / voltage = current

Now you do the math

In energy meters , slow but continuous , rotation is obtained even when there is no current flowing through the current coil and only pressure coil is energized which leads to over compensation of friction and it causes creeping in energy meters

ANY METAL (COMPOUND ELEMENT) WITH HIGH FERROUS CONTENT. THIS IS COMMONLY KNOWN AS IRON.

Resistances in series act just as if they were one single resistor. The value of the single resistor is the sum of the individual resistors connected in series ... Ra + Rb + Rc etc. When several resistors are in series, the effective total is greater than the biggest one. Resistance in parallel act just as if they were one single resistor. The reciprocal of the value of the single resistor is the sum of the reciprocals of the individual resistors connected in parallel ... Total effective resistance = 1 divided by (1/Ra + 1/Rb + 1/Rc + etc.) When several resistors are in parallel, the effective total is less than the smallest one. Once you figure out the effective value of the series- or parallel-combination of many resistors, you handle them as if they were one single resistor, and you can work with the voltage and current: Current through any resistance = (Voltage across it) divided by (its resistance).