Electrical Engineering

Hum is caused in (low frequency) AC capacitors by electrostatic forces between the capacitor's plates, causing them to vibrate.

1. If there is fluctuation in electricity and you are using manual stabilizer.

2. If there is improper earthing or earth leakage.

3. If you are using d,ble earthing.

Diodes do not obey Ohm's Law, at least when viewed as an individual component. When doing circuit analysis, however, you can make the case that, for a specific situation, they do. In fact, using this technique, everything "obeys" Ohm's law.

In the simple case of a resistor, operated within its limits, Ohm's Law works just fine. Voltage is current times resistance. As voltage goes up, current goes up proportionately. You can predict the voltage or current knowing the other along with resistance.

A diode, on the other hand, is non linear. As you apply voltage across it in the forward direction, it initially has high resistance. All of a sudden it has low resistance as it begins to conduct. As you increase the current, the resistance decreases, so the voltage drop is relatively (though not exactly) constant. At a certain point, around when you exceed the maximum forward current, the diode fails.

In the reverse direction, an ordinary diode seems to have high resistance, until you reach about max reverse voltage, at which point the diode fails. In the case of a zener diode, reverse behavior is similar to forward behavior, except at a different voltage.

Even though the diode does not obey Ohm's law, you can still use Ohm's Law to analyze the circuit. You just have to remember that the dynamic resistance of the diode changes as a function of the applied voltage. The value of Ohm's Law becomes evident when you consider that, at each static condition of the circuit, you do know the voltage and current through the diode and, as a result, you can use Ohm's law to calculate its dynamic resistance. This will allow you to extend the analysis by back substitution and simplification until you know more and more about the circuit.

The different testing steps of HT and LT panel include commissioning, sanctioning, erection and the CPP set. All this is done in the servicing of the transformers and the HT/LT control panels.

A 556 IC is a dual 555 IC in one 14pin chip. With that said it composed of two timers capable of running in Astable, Bistable and Monostable modes. The 556 can be used as a function generator once the appropriate external components are connected.

One note about using the 556/555 as a function generator is that you cannot achieve a perfect 50/50% duty cycle where the time on is equal to the time off, this is due the characteristics of the internal components having a different charge/discharge rates.

Yes it is true that volts jolt but current kills.

Current can kill you if it is high enough, and if it goes through your heart then it will most definitely kill you. Only a small amount of current is capable of killing some one.

If the voltage is high enough it can send the current through your body and to your heart.

This depends on your definition of hazard, and low voltage for that matter. A car battery is 12 volts, which is not enough to kill someone, but it is certainly enough to melt metal if you drop a metal tool across both positive and negative terminals. The melting metal can cause burns, etc.

Lap windings has four current paths, the same as the number of the field poles, while the Wave windings has only two paths, regardless of the number of poles. Lap windings are also used for applications requiring lower voltages at higher currents, while Wave windings are used for applications requiring higher voltages at lower currents

The applied voltage is 53+28 = 81V.

I'm trying to figure this out myself! suprised noone answered yet lemme know when u get the answer.

A BOD shaker incubator is designed to maintain a temperature of 20 degrees C. The BOD incubator has a compressor that works as a heater and a cooler maintaining the temperature at a precise 20 degrees.

yes, of course.

The basic difference between fdm and fdma is that fdm is used in wired system where as fdma is used in wireless communication.

The ability of conductor to induce voltage in itself when the current changes is called inductive reactance.

tracking radar

Because if speed was used, the power system frequency would be changed. A synchronous generator spins at synchronous speeds.

Synchronous generators 101: A typical synchronous generator will have a field winding (typically on the rotor, or rotating part) and a stator winding (the stationary part where power is supplied to the power grid). Current is injected into the field winding, turning it into an electromagnet. This field current is controlled by the Automatic Voltage Regulator (AVR). The more current supplied to the field winding, the stronger the electromagnet becomes, and the more power is required from the prime mover (whatever is supplying the power - steam turbine, for example) to keep the generator spinning at synchronous speeds.

1) Use an operational amplifier.
2) If voltage is not an issue, a transformer may be used.

DC forward voltage is generally related to diodes. It means the voltage across the diode when the diode is forward biased, i.e. when the anode is more positive than the cathode. The forward voltage is the drop across the diode. The amount of drop is a function of current. For typical silicon diodes, the forward voltage drop ranges from 0.6 volts for very small currents, to 1.5 or more volts for large currents.

Star is the European name for Wye.

Delta is the same everywhere

Some examples of resistive loads are: heaters, incandescent lights, fans etc.

In any rectifiers circuits the purpose is to get a DC voltage by giving AC voltage as input.
by connecting capacitors parallally in the circuit it is possible to get pure DC output.capacitor filter only eliminates the ac quantities remainimg in the output waveforms.so that finally we get pure DC for further aplications in electronics circuits.

P-P voltage = RMS voltage * 2 * sqrt (2)

Here's an example: house voltage is 120VRMS, which is actually ~169 volts peak - neutral. double this will give peak to peak value.

With Hipod leakage current of any circuit (HT Distribution/ Transmission Lines) can be determine and with IR Test insulation resistance between two circuit or parts of machine is determined.