Electrical Engineering

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You need also to know the resistance of the cable. First you establish what the current of the load is. Then from that you calculate the wire size. From a wire size chart you find the wire resistance. Then use the formula I (squared) x R.

When working on a current transformer the secondary windings must be shorted.

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Best to get quotes from two or three licensed electricians for the installation of the necessary extra fuses, breakers, etc., testing and commissioning (= handing over to customer to use) of a 120V panel for as many circuits as you want. Though the question does not specifically ask about DIY ("Doing It Yourself"), if you are not a licensed electrical technician you should not even think of doing this kind of work as a DIY project because 3 phase 240V power supplies can kill you if you don't know exactly what you are doing. Depending on your local wiring codes and regulations, it may be illegal to attempt to do such work if you are an unlicensed person.

1 for every 13 outlets, lights etc plus one for each major appliance ( heavy duty ) The minimum *required* number of circuit breakers will be dictated by your local building codes, so there is no one answer that will fit all. If you are planning on building or remodeling a house and are just interested in a back of the envelope estimate, keep in mind that up to a point, more circuits, and thus circuit breakers, are better than fewer. At a minimum, I would use a dedicated circuit for each of: - the furnace - the air conditioner - the refrigerator - the stand alone freezer - the basement lights (or the lights for where ever the breaker box is located) - the sump pump (if you have one) - the water pump (if you have one) - the garage door opener By using a dedicated circuit for each, you minimize the chance of a malfunctioning device or frayed extension cord causing the shut down a critical house hold system. From there it's a matter of how many rooms and outlets. For a family room with an entertainment center, computer equipment, etc., two circuits for the outlets and one for any overhead lights would not be unreasonable. On the other hand you might have two bedrooms share the same circuit for wall outlets and another shared circuit for the ceiling lights. If each room has its own air conditioner, the ideal situation is to locate an outlet by the window which is a circuit dedicated just for that air conditioner. As an aside, ground fault detectors are a must for the kitchen and bathroom, but use self contained ground fault outlets rather than a ground fault circuit breaker for these areas. Ground fault circuit breakers are best for outdoor circuits, like outdoor lighting, swimming pools, etc. While the building codes may dictate a minimum number of circuits needed, based on the size of the house, there is nothing to stop you from having more. What you will need to do however, is make sure you do not exceed the capacity of your electrical service. For that the services of a licensed electrician are highly recommended.

Alternating current is very important because the whole worlds uses it and it is the best method to transmit electricity around.

all electric heaters draw a lot of current (voltage times current = watts [or power])

and a toaster heats bread (no it toasts Bread)

Put a known small resistance (maybe 1 ohm) in parallel to it. Then use the equation I=V/R (R being the known resistance, and V being the voltage readout)

So when using a 1 ohm resistor, if the voltmeter reads 2.35V, it means I=2.35/1 = 2.35 A

A dynamo is another name for an a.c. or d.c. electrical generator. They are used for converting mechanical energy into electrical energy.

E = I R = 22 x 7 = 154 volts.

current is the movement of charg carriers (normaly electrons) through a conductive material. the easyest way to think about it is that voltage is like a force pushing on the electrons, and resistance will push back against this. Current is then the result of these two factors. This is where we get the equation voltage=current*resistance. In answer to your question, increasing the circuit resistance will decrease the current in the circuit, as long as the supply voltage stays the same.

When you say holdhold supply of 230volts, you are referring to the RMS value, not the peak value.

A 3-phase rectifier bridge can be used with a single phase supply, it just means that four of the diodes are not connected. The peak voltage (if a reservoir capacitor is used) is sqrt(2) times the rms supply voltage and the average voltage using inductor smoothing is 0.9 times the rms voltage.

This isn't a great idea. You likely could if you lowered the frequency to ~40hz (if made to run at 60hz), and cut the load on the motor down to 63% of its' rated hp. You want to keep the volts per hertz equal or near the nameplate values.

The letters in the SO in cord description stand for two different things. The S means that the cord is extra hard and flexible. The O means that the cord is oil resistant.

Generally speaking, for properties such as households, offices, factories and other industrial sites, schools, hospitals, etc., their electrical energy consumption is measured in kilowatt.hours. (kW.h)

For towns, cities, counties, states, countries and other major geographical areas, their electrical energy consumption is measured in megawatt.hours (MW.h) or gigawatt.hours. (GW.h)

They don't. By definition, ions are charged particles, and charge is what electricity is all about. If the ions are suspended in a medium like a dilute acid solution, they may move slowly, but only because of the molecules that are in their way. If it were entirely up to a positively charged ion, it would immediately go to a grounded metal object that's in it's neighborhood.

It's power that is loss during the tuning of the RF network. Ideally the reflective power is tuned to zero before striking the plasma to maximize the efficiency of the RF generator.

we call them ground fault breakers

10 milliamps thru you instead of the normal current path can kill you

if you have a neon test lamp connect it to one of the hot leads and earth the other.

if it lights the earth leak detector is faulty.

if it opens the breaker its good

most here in the usa have a test button

Leaving a receptacle energized will not consume power, some things left plugged in while not in use will consume power.

3 phase synchronous generator or motor require DC current in the rotor. Conventional way of supplying DC requires use of commutators, which requires timely maintenance. To overcome this Brush less Excitation systems is used.

Brushless Escitation system consists of one pilot excitor - DC generator with rotating PM as the field and the armature as the stator. The armature of the pilot excitor is connected to the stator of main excitor which is a 3-phase synchronous generator (please do not get confused, this is not our alternator but the exciter for the alternator). The rotor of the main exciter is connected to a diode bridge to get DC. This is connected to the rotor of our alternator.

Voltage determines a cable's insulation thickness, not its conductor thickness (or, more accurately, its cross-sectional area). It's current that determines the csa of a conductor, not voltage.

By using a gas engine to drive a dc motor. Motors are cool in the way that if you give them power they will spin and if you spin them they will make power. There is a ball of coiled wire in a motor and when it spins the magnets in it try to resist the spinning but if it succeeds in spinning then electrons will be pushed through the coils by the resistance of the magnets and ultimately through your electrical appliance's.

First select the correct measurement type. Current is measured in series and most meters have separate inputs for that. Resistance should be measured with the component out of the circuit. Volts in parallel. Be very careful. Best is to be shown how.

ANSWER: A meter any meter cannot measure current directly but rather it measure the voltage drop to translate into amperes.