Electrical Engineering

Overloaded circuit, short in circuit, or defective switch.

Read the capacitor that you remove

RMS (root mean square) is often used as opposed to the peak to peak value because it expresses the actual power for AC systems. For example, your actual home voltage is closer to 170 volts peak - neutral. Say you have 1/2 Amp peak -neutral current flowing. Actual power is equivalent to:
P = Vrms*Irms; RMS = Vpeak-neutral/sqrt(2)
P = 1/2 * (Vpeak-neutral) * (Ipeak-neutral).

You can quickly see that discussing wire size, fuse sizing, breaker sizing, etc. in terms of peak - neutral or peak- peak volts / currents, will quickly become more complicated than it needs to be.

This is also a more useful value from a usage standpoint, as you will be charged for the power you use.

Single-phase motors efficient because the circuits are less complex; fewer electrical steps must be taken to achieve a desired output, so less power losses , how ever efficient=P(out)/P(in) , P(out) which more related for power losses as heated ,iron losses, stray losses and mechanical losses.

A parallel circuit has more than one resistor (anything that uses electricity to do work) and gets its name from having multiple (parallel) paths to move along . Charges can move through any of several paths. If one of the items in the circuit is broken then no charge will move through that path, but other paths will continue to have charges flow through them. Parallel circuits are found in most household electrical wiring. This is done so that lights don't stop working just because you turned your TV off.

you really can't amplify electricity. You can amplify sound but that is different. You can change the voltage but the actual power will not change because as voltage is raised current is reduced. you can only increase power by increasing the mechanical input to a generator which will increase the electrical power as well. The conservation on energy says that power cannot just be created. It needs to come from some where either mechanical or thermal.

Following the conservation of energy, you can convert kinetic energy into electric energy using a (relatively) small amount of electricity - this is what a synchronous generator does. A small amount of electricity is used to create a magnetic field; the stronger this field, the more energy can be "pushed out" of the generator; this energy must come from the kinetic energy stored in the spinning machine. In this way, a synchronous generator can be thought of as an electricity "amplifier".

By Ohm's law, voltage is directly proportional to current. You question seems to be missing some detail. Are you talking about an AC dircuit where there is capacitive or inductive reactance present? If so, please note that Ohm's law still applies, but things are a bit more complex with AC and inductance because you now need to consider voltage to current phase angle, as well as how you are measuring things. Please clarify your question.

embedded system is an electronic device which is made for an specific task.when we are taking about the embedded system development.it include the embedded life cycle,in which we have to specify the product ect,up to maintanence

The ampere is the SI Base Unit or electric current. It is NOT derived from the charge (coulomb) but from the force resulting from its magnetic effect. The ampere is defined in terms of the force between two, parallel, current-carrying conductors due to the interaction of their magnetic fields. The coulomb, on the other hand, is an SI Derived Unit, based on the ampere and the second.

It depends on how the capacitor is connected and whether the supply voltage is a.c. or d.c. Assuming you are talking about a power-factor improvement capacitor (connected in parallel with an inductive load, supplied with a.c.), then the supply current will reduce.

Property of Silica gel is to absorb the moisture. Colour of dry silica gel is blue and it turns into pink when it is saturated with moisture. When the colour of silica gel turns out pink, the wet silica gel is removed and the fresh silica gel is filled. The wet silica gel can be heated and made dry for reuse.

Resistance converts electrical energy into other forms of energy, such as light, heat sound, motion, and magnetic effects.

If you put a diode in series with an AC sine wave that goes plus and minus, it will cut off either the positive or negative portion of the waveform, depending on the direction of the diode in circuit. So in effect you have a pulse equal to one half cycle of the sine wave.

Connect the three wires that come out of the motor to the three supply wires that come from the magnetic contactor. Turn the power on and push the start button. If the motor turns the wrong way, shut the power off and change any two wires in the motor junction box.

A kWh meter measures the flow of energy along the circuit that the meter is connected to. Normally power flows from the supply to the load, which is the conventional direction, but in some cases, for example if the load is replaced by a generator, power can flow the other way and in that case the meter indicates a backward, negative, flow of power.

Connecting an ammeter does not reduce the frequency errors.

Zero amps equal one volt. To find amperage you need one of the following formula I = E/R, I = W/E or I = to the square root of W/R.

I is amperage, E is voltage, W is watts and R is resistance.

electrons have less effective size than that of holes(which actually are not real)...formula says

m(mobility)=drift velocity/electric field=et/m where t is relaxation time..

so mobility is inversely proportional to mass

hence e has more mobility.

i think that it is possible that for unknown circumstances i don't know it.

In Direct Current, electrons flow from the negative pole of the electrical source, through the load, to the positive pole of the electrical source. Current is constant as there are no variations in voltage over time in the circuit. Voltage and current are measured by directly measuring the voltage and current in the circuit.

In Alternating Current, electrons also flow from the negative pole of the electrical source, through the load, to the positive pole of the electrical source. However, the polarity of the poles changes +/- to -/+ to +/- , alternating polarity over and over again. This causes the direction of the electrons in the circuit to change each time the source poles change polarity. Current and voltage are not constant in an AC circuit as they vary with the waveform generated by the electrical source. In many, but not all cases, voltage and current are measured by the RMS (root-mean-square) method as directly reading the peaks of the AC waveform will not indicate the correct amount of energy in the circuit.

Copper has a high thermal conductivity, not low.

This is a good generalization of any metal, although they vary in conductivity.

In three-phase systems, we always consider individualline or phase currents, or individual line or phase voltages. In other words, we treat currents and voltages no differently from single-phase currents or voltages (i.e. we don't 'combine' them because they are three-phase quantities). So these quantities are expressed in r.m.s. values.