Electrical Engineering

They use both. AC is almost universally used because it is easy to convert it to different voltages by step up or down transformers. Over very long distances and in special circumstances DC is used because AC has higher losses. The phase synchronization with other power grids as well as the frequency is also a problem with AC. A common example is where 50 Hz and 60 Hz power systems share resources.

You can't really separate them. It's the current flowing through your body that does the damage, but the value of the current depends on the voltage across your body -the higher the voltage, the higher the resulting current.

type 1 is auto reset

it cools off and turns back on

Type 2 is power off reset

turn power off it will reset

type 3 is manual reset

you must turn it off and back on

This is the safest.

The only one I would ever use.

Fuses are far better the contacts cant weld shut with extreme overload

you know something is wrong

so you can see if you mowed the cord with the lawnmower

tossed the blender in the sink

circuit breakers work when something goes badly wrong

type 1 and 2 decide that some magic fairey

has corrected the problem and its ok to apply full power again

The only explanation to that is given by the presence of back emf Eb, which plays a critical role in governing the operation of the motor. The back emf, develops as the motor armature starts to rotate in presence of the magnetic field, by generating action and counters the supply voltage. This also essentially means, that the back emf at the starting is zero, and develops gradually as the motor gathers speed.

The general motor emf equation E = Eb + Ia.Ra,

at starting is modified to E = Ia.Ra as at starting Eb = 0.

These are two different rating coils.

I will not take 24V and 240V ac coils in this explanation, I will take low voltage ac coil and high voltage ac coil in the explanation in general.

Low voltage ac coils have low insulation in general compared to the high voltage coils since we need more insulation for the high voltage coils.

Low voltage ac coils have less no of turns and less diameter of coil compared to high voltage ac coils.

But the thickness of the conductor used for the ac coil depends on the current rating of the coil only it does not depends on the voltage.

Here is the formula you use. I = E/R. I = amperage, E = volts, R = resistance in ohms.

Type your answer here... it is used to find the insulation break down of the conductors from turns to turns and layers to layers.it is aninsulation test for the transformers

You will need to take the resistance of the load into account if you are going to design a voltage divider. The resistance of the load can completely change the voltage ratio of a voltage divider if not factored into the calculation.

you can measure or read R(load), then R(needed) = 0.8 R(load)

The ratio is between 30% to 40 %

The equivalent mm2 cross-sectional area of a 5.26 mm2 conductor is a # 10 AWG conductor. A # 10 AWG conductor size is protected by a 30 amp fuse.

Well firstly, is the capacitor connected to a DC or AC supply.

On a DC supply the capacitor would draw current until it had fully charged, at which point the current falls to the leakage current. Electrolytic capacitor will always leak a little.

On an AC connection, current will pass continuously, and the capacitor may rupture if connected across an AC supply.

The current that would flow on an AC connection is given by the impedance, which is calculated from the reciprocal of 2 x Pi x F x C

Because it is the reciprocal, the impedance reduces as the capacitance in Farads (F) increases. So, the bigger the capacitance, the higher the current.

Therefore, for AC, only low values of capacitor are found connected across the supply (usually with a resistor in series) for interference snubbing across a contact or switch. Larger values are placed in series with the current, to act as current limiters or high pass filters.

Weight is sensed using a transducer. A weighing machine transducer is usually a spring/piezoelectric component. The resistance of it varies as the weight changes. So does the current through it. This current is sensed, and is converted suitably to output it's weight.

Multiply the power of the load [1.732 x UL IL x power factor], expressed in kilowatts, by the operating time, expressed in hours. This is only practical for a constant load.

P/Vol=A/T

P: Power

Vol: Volume

A: Area

T: Period

The voltage can be either 250000 kilovolts or 240 volts, it can't be both so the question can't be answered.

<<>>

There are zero amps in 250,000,000 volts. Amps can be found using the following equations. Amps = Volts/Resistance in ohms, Amps = Watts/Volts and Amps = Sq root of Watts/Resistance in ohms.

RMS stands for root mean square. This is done so that negative values are then treated as positive values. In AC power for example, the voltage varies between a negative and a positive value. The number is squared and then the square root of this value is taken and the mean (average) of these numbers gives the answer. For example -40 is squared to become 1600 and then the square root of 1600 is taken to become 40 (a negative number becomes a positive number).If this wasn't done then the average value of AC power would be zero.

when we want maximum resistance they are connected in series.

when resistors are connected in series total resistance is maximum

when resistors are connected in parallel total resistance is minimum

for series total R=R1+R2+R3.........

for parallel R1 in parallel to R2 total 1/R=(1/R1)+(1/R2) ie R=(R1*R2)/(R1+R2)

The area of the sheets, the distance between them, and the material between them.

Simply put, a single phase supply has one or two hot wires, may have one neutral wire, and (hopefully) one ground wire. A three phase supply has three hot wires, and may (wye connection) or may not (delta connection) have a neutral. It also will have a ground wire. A more complex explanation involves the phase difference between hot wires. For three phase there is a 120 degree phase difference between each of the three possible pairs of hot conductors A-B, B-C, C-A. For single phase, since there is only one possible pair of hots, there can be no difference.

The current rating is 2A (2 amps).

Without electricity the human society goes back to stone age. Almost everything what human does today is with the help of electricity.

People who stay with out electricity are either completely backward and in a state poverty or they are saints in Himalaya.

The open Delta or V-Connection transformer is an improvement of the 1 three-phase transformer. The open Delta transformer can restore power in a Delta-Delta three-phase bank when one of the three single-phase transformers, which can be individually disconnected and replaced in case of failure, breaks down. The open Delta transformer then allows functionality to be restored, but at a reduced power of 57.7 of the original power.