Electrical Engineering

Yes. This is called motoring, and is generally a bad thing; instead of producing power, the generator begins to suck in power, which causes a strain to the power system. Many generators employ special protective relays to prevent operation as motors (usually denoted '32', or a directional relay).

I believe some generators (specifically hydro units) are intentionally run like a motor (but without load) to provide power factor correction. I can't find my references for this though, and have no direct experience with it.

Both Current and Potential Transformer are instrument Transformers which are used to measure very high current and voltage respectivly.

Current Transformer is a Step up transformer and used to measure high current, its secondry is connected to ammeter of very small capacity (usally 5 A) but its Scale is calibrated according to actul values.

Potential Transformer is a step down tansformer and its secondry is connected to voltmeter of small range but again the scale is calibrated for actul values.

So as a whole both Current and Potential Transformers are used to measure high values of Current and Voltage respectivly.

wire two 8 ohm speakers in a parallel circuit!

A standard piece of switchgear in distribution systems comprising of switches for switching power cable rings and of switches in series with fuses for the protection of distrbution transformers. RMU: Ring Main Unit. RMU used for H.T.side. RMU is having

3no.s of switches(Circuit Breakers or Isolators or LBS), it

is used for two inputs with mechanical or electrical

interlock and one outgoing to the load. Either one input

with two outgoings. RMU used for redundancy feeder's

purpose.

Ring main unit is used in a secondary distribution system. It is basically used for an uninterrupted power supply. Alongside, it also protects your secondary side transformer from the occasional transient currents. Depending on your applications and loading conditons you can use a swicth fuse combination or a circuit breaker to protect the transformer. This transformer connected to the switch fuse/ circuit breaker is called your T off. In a common arrangement you have Load break swicthes on both the sides of your T off. Ring main Units come in standard ratings of

11/22/33 kV, 630/1250 A, 21 KA/3 secs.

Basic Required Functionality

Backup Functionality

Required Signalling Schemes

Available communication.

Supply (AC or DC?)

Operating Voltage on Inputs.

CT input 1A 5A or other?

How many CT inputs (Will it be used in Breaker and a Half arrangement)

Do you require one or 2 VT input.

Do you need sub cycle operation.

Mainly because your home is supplied with a.c. not d.c. Even those appliances (audio systems, etc.) that require d.c. supplies can be connected to an a.c. supply, because they have internal transformers/rectifiers which change the a.c. voltage to the required d.c. voltage.

If the DC motor is a permanent-magnet motor, simply spin it using some source if mechanical motion. It will generate voltage. You could spin it with your hand, a windmill, a water wheel, another motor, etc.

416 A and 208 A respectively

In an electric circuit, ratio of current and voltage is constant which is known as the resistance of the circuit. If voltage or current is to be changed the resistance has to be changed. You cannot keep an invariable resistance in the circuit and increase current while keeping voltage as constant.Hence to vary the voltage or current in a circuit different equipments like rheostat,potentiometer are used.

It is 500kv between rahim yar khan and multan.

no. you want to measure across the desired circuit segment. whether you are measuring voltage drop or current.

A series circuit. Turning off the light interrupted the only path for electricity to the hair dryer.

In any conductor, increased current flow will result in voltage drop. This won't have any effect until you reach about 5% of the circuit voltage, at which point your efficiency declines. If the increased current trips the breaker, then your Voltage will be 0

For reference: Vd= (1.732 x K x I x L) / cmil

Vd is Voltage drop in Volts

1.732 is sq rt of 3 for three phase circuits. For two phase or single phase circuits use 2

K is resistance in Ohms of 1cmil, 1ft of conductor.

K=12.9 for copper conductors, 21.2 for aluminum, both at 75 deg C

I is the current (hence, the more current, the more voltage drop)

L is the length of the conductor

cmil is the wire size, or more accurately, cross-sectional area of the conductor

100, or twice to expected output. This is because, on the alternate half-cycle, the line goes to the alternate peak-peak voltage away from the charged capacitor. In this case, that will be 100.

However, in terms of actual rating, you must always provide a margin of safety. I would use a 200 volt diode in this application, to allow for variance in limits and transient response.

An ammeter is an instrument which is used for measurement of current flowing in any circuit

No because the Moon does not have a magnetic field like the Earth does. The Earth's magnetic field appears to be created by a liquid metalic out core circulating around a solid core. This works like a dynamo which creates the magnetic field around the Earth. The Moon lacks a similar core stucture. This is also the reason why the Monn has no atmosphere.
A magnetic compass would not work on the moon, for the moon does not have the magnetic field that the earth has, allowing us to use this device.
No, because moon does not have magnetic force like earth

V = IR

Voltage = Current * Resistance

so

9 = 0.25 * R

Hence R =36 Ohms

A: They are both the same the first is the product volts times amperes the second is related to volts and amperes also. The difference is the second term is used to rate transformers power output in terms of voltage to amperes. Example a 1kva means that you can expect 1kv at 1 ampere on the transformer output . But here is the trick the transformer only put out 250 volts So now what It means is 250v at 4 amperes nothing has changed the power remains the same 1 kw

<<>>

To convert KW to KVA just leave the power factor (pf) out of the equation.

Formula for Kilowatts = I x E x pf/1000.

Formula for KVA = I x E /100.

The usual supply in Russia is 220 v 50 Hz which corresponds to a 3-phase supply of 381 v. You need to check your motor to see what voltage range it is designed for, but 381 v is only 4.8% low so it should be all right.

The average voltage a house outlet will give actually depends on how far of a distance the house is from a transformer on the pole. If the house is fairly close to the transformer, it will probably give around 120 volts. However, if the house is a bit far from the transformer, it will probably give around 107 volts.

"Induced" is the verb you are looking for. A current is induced in the secondary circuit by the current in the first changing, provided both conductors are close enough for the driving current's electro-magnetic field to enclose the second conductor.

Note that word "changing". Direct current produces a field but that remains constant and does not induce a secondary current, as a.c. does.

ab