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Electrical Engineering

Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.

23,056 Questions

What happens if capacitance of circuit is more than resistance?

Resistance is a completely different quantity to capacitance, resistance being measured in ohms and capacitance in farads. So they are 'apples and oranges'. You should be asking, 'What happens if capacitive reactance (in ohms) is larger than resistance?'. And one answer would be that the phase angle will be greater than 45 degrees. There are other answers, too, but it depends what you want to know,

Why does higher resistance have a larger voltage drop across it?

In a d.c. circuit, voltage drop is the product of resistance and current through that resistance.

How can calculate kw and kvar?

There are numerous ways of doing this; it depends on what information you are give to start with. One method is:


power = apparent power x cosine (phase angle)


reactive power = apparent power x sine (phase angle)


(where apparent power = supply voltage x load current)

How do you draw phase diagram for transformer operating at load with lagging PF and leading PF?

In order to draw the phase diagram for transformer operating at load with lagging PF and leading PF, you will need to know the equation for the transformer being load free. This constant will help you with the load bearing equation of Np/Ns=Vp/Vs=Is/Ip.

What is the purpose of resonance circuit?

Resonance describes a 'condition' rather than a 'purpose', but it is made use of in (for example) radio circuits, in order to tune the radio to a particular frequency (the resonant frequency of the signal).

Why does the field winding of a series dc machine has less number of turns than that of a dc shunt machine?

The series winding takes the full load current of the generator. So it require only a few turns to produce the required magnetic field and so the resistance is lower.

What is link between maximum current and average current?

You are, presumably, referring to alternating current, in which case the 'maximum' current is the peak or amplitude of the waveform. The 'average' value of current is zero, because the average value of the first half of each cycle is negated by the average value over the second half of each cycle. This is why a.c. currents and voltages are always expressed in 'root-mean-square' (r.m.s.) values which is the value of an a.c. current that does the same amount of work as a given value of d.c. current. The r.m.s. value for a sinusoidal current (and voltage, as voltage and current are proportional) is 0.707 times the peak or maximum value.

Why different frequencies has same average value and RMS value?

Voltage and frequency are independent quantities.

Answer

Because the r.m.s. value is dependent on the shape of the waveform, not its frequency. The average value of any symmetrical waveform is zero and is independent of frequency.

Is electric shock from batteries possible?

With enough batteries to get sufficient voltage - sure. Put your tounge to the terminals of a 9 V battery and you'll see.

Why are voltages for registering a bit of 1 on Ethernet so low when transmitting electricity on copper wire is high?

its due to truncation on the transmission of voltage with an electric current. The copper wiring has a high capacity due to years of fecal devolging.

The voltmeter has greater accuracy when measuring what kind of current?

A voltmeter has greater accuracy when measuring direct current. This kind of current is constant unlike alternating current which has constant fluctuations.

What is winding resistance?

Wind resistance doesn't exist The correct term is Air resistance, which is the force that pushes against an object while travelling. For example, air resistance constantly pushes against a car whilst it is moving. This is because a car has to 'split' the air to travel through it.

Air resistance can be decreased by making the object (for example a car) more aerodynamic like an F-1 racer. Aerodynamic help to channel the air around the object and allowing it to push through the air easier.

I can't go in-depth as it can get quite complicated, but I hope this helps anyway.

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What is isolation resistance?

I think you mean, 'insulation' resistance! It's the resistance of insulation, normally expressed in megohms.

How you can convert 1-phase voltage to 3-phase voltage and vice-vars a?

A single-phase supply is obtained between any two line conductors or between a line and neutral conductor of a three-phase supply. To obtain a three-phase supply from a single-phase source is far more difficult, and requires additional equipment.

Can batteries of unequal voltages b connected in parallel?

no..... The battery with lower voltage will consume power from the higher one...

What does 35V and 1000uF on capacitor specify?

1000 microfarads is its rated capacitance, while 35 volts is its rated voltage.

Why you do insulation resistance test?

in order to avoid unwanted short circuit break downs.... short circuit can burn the transformer and motor winding.... Megger is the device used to check the insulation .

What is the ratio of apparent power to true power?

The ratio of apparent power to true power is called 'admittance', expressed in siemens. Admittance is the inverse of impedance.

How do you find the transformer block in Alien Shooter 2?

To find the transformer block in Alien Shooter 2 you have to go down the sewer. This is one of the most thrilling games.