Electrical Engineering

One horsepower (electric motor) is 746 watts, so ten horsepower is 7460 watts. Divide that by a power factor (assumed) of 0.8 and you get 9325 volt-amps. Divide that by a voltage (again, assumed) of 240 and you get 39 amperes.

For calculation purposes the electrical code book states that a 10 horsepower motor at 240 volts will draw 50 amps. The motor's nameplate amperage that is driving the rotary phase converter should all ways be used first.

The electrical code requires a breaker for a motor to be 250% of the motor's operating full load current. 250% of 39 amperes is 97 amperes. I would use a 100 ampere breaker for a 10 horsepower motor.

If the motor rating is used from the code book values, then 50 x 250% would equal 125 amps and that is the size of the breaker that must be used. This is the reason that the motor's exact name plate amperage rating should be used. In the long run feeder wire costs could make a saving in the overall projected costs.

Usually refers to a transformer. A step up transformer increases the voltage and a step down decreases the voltage by an amount proportional to the ratio of the windings between Primary and Secondary. A 1:2 ratio is a step up and doubles the voltage. A 2:1 would be a step down and halve the voltage.

This really depends on the scenario. What type electrical circuit are you talking about.

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one condition for the above question is either conductor or magnetic field must be rotating.considering rotating field and stationary conductor,the magnetic flux will be cut up by conductor resulting in the induced emf in the conductor.

Inductive reactance does NOT have it own sign or symbol. Rather, it uses Ohms as a quantifier. But Capacitive reactance ALSO uses Ohms as a quantifier. Fortunately, 1 Ohm of Inductive reactance is cancelled by 1 Ohm of Capacitive reactance at the same frequency of measurement.

Both the supply wires that enter a series motor is the field windings the field is split in two and is connected at the split to the brushes that is connected to the commentator of the armature, so the current pass thru the first half of the field then thru the armature and then thru the other half of the field. With a parallel DC motor the two fields is in series and the two wires is connected to the brushes so is the supply.

Ohm's Law: Voltage is resistance time current

So, 28 ohms and 3.8 amperes means 106.4 volts.

Transformers may be supplied with an LTC (load tap changer) that physically adds/removes windings from one side to control the voltage output of the transformer. If the LTC is moving, it is referred to as "tapping". An LTC has several discrete tap positions. The ones I see most often have 33, 16 up, 16 down, and a neutral.

i think it is ac. bcs the direction is changed with time. so it is ac

magnetisation characteristic of dc generator is nothing but the open circuit characteristic of dc generator where we determine the operating characteristics of dc machines.it is used to determine the open circuit armature voltage keeping armature current zero,at rated speed and after few laps of time filed current is gonig to be raised from zero.where the armature open circuit voltage is reached above its rated value.

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I am guessing that what you think is an eight is really the symbol for Ohms which is the Greek Omega. So it would be 1,000 Ohms.

Its not recommended. A four ohm speaker cabinet can be changed into an eight ohm speaker cabinet, if you have enough speakers in the cabinet in parallel that can be rewired in series. Unless you have a high end cabinet, the likelihood of this is small.Two four ohm cabinets, however, in series will be eight ohms. Keep in mind, however, that doubling the resistance will halve the current, which will quarter the power. Also, changing the impedance of a speaker system will change the frequency response, because often the filters are tuned with resistors.

The current capacity of a cable varies depending on the type of conductor material, and the type and rating of the insulation. An excellent table that shows the capacity of different types of cables can be found here:

http://www.myelectrical.com/pages/cables/cableCurrents.aspx?id=061112125012.

Also, the current capacity of a cable will be limited by the electrical code that one is using, this varies in each developed country. Most American companies use NEC (National Electric Code) as there source for electrical codes (the most recent version being NEC2008), and much of the rest of the world will use ICC EC (International Code Council Electric Code).

balanced to unbalanced line

infinity- so that all the voltage is measured across the component instead of losing some in voltometer circuitry

A typical 17" LCD for computer uses about 40 watts. Compare this to 17" CRT which is 120 watts.

This may vary as new technologies are introduce in the lighting of this appliance.

The switch to LEDs for backlighting will reduce this number significantly.

A surge is an over voltage and over current situation and a brownout is an under voltage situation.

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Transformers require changing magnetic flux to operate. DC current provides a steady current, with no changes in magnetic flux that can be picked up by the output coil.

Alternating current has continuously changing direction which produces continuous changes in the magnetic flux. This induces changing voltage in the output coil. This is (or was) the huge advantage of AC power systems worldwide: The voltage could be easily changed from high voltage for generation and transmission into low voltage at the consumer. DC generators had to run at the voltage required by the consumer and powerlines could not be higher voltage / lower current than the consumer.

Today, switching systems easily convert DC to other DC voltages, DC to AC, etc. This is done in most computers, telephones, stereos, etc. It can even be done on a grand scale, allowing use of high voltage DC power lines in selected places.

Routers are responsible for delivering and receiving network communication. They regulate what goes in from either "leg" of the router and what goes out of either "leg". They can also be configured to send specific data through specific routes, hence the name.

The purpose of routers is to take the signal that is being sent via the cable wire and convert it into a wireless signal that multiple devices can connect to.

Alternating Current( AC ) constantly reverses itself as a result OS reversing electromotive force.One complete reversal is a cycle,and the number of cycles per second is the frequency of alternating current .The standard frequency of alternating current in the United States and the rest of North America is 60 Hz(1 Hz or hertz,equals 1 cycle per second )ex...Transformer,AC generator

In electrical engineering, the percentage impedance of a transformer is the voltage drop on a full load, which is expressed as a percentage of the specified rated voltage. It's measured by conducting a short circuit test.

I've seen it done, but be certain that the motor is connected to the correct VOLTAGE. The UK uses a 50Hz, 240V electrical system. The US uses a 60 Hz, 120/240V. The motor you are referring to was probably used in the UK, so will probably need 240V.