Electrical Engineering

600 WATT

Voltage and current are actually inversely proportional to one another. The formula P=IV is what you need to look at here, where P is Power, V is voltage, and I is current. Rearranging the equation you will see that V = P/I. You can see that if you increase voltage, while holding power constant, current is reduced. Now, to your question. The losses on a transmission line are proportional to the current flowing on the line, so transmitting at high voltage (and hence low current) is beneficial as it reduces the amount of power that is lost due to resistance in the line itself.

In a HT cable there are 2 layers of semiconductor one on the conductor and second on the XLPE insulation.

As we know semiconductor behaves as conductor when temperature rises. So when the HT cable is on load its conductor temperature rises due to this the semicon layer which is on conductor behaves like conductor and as a result overall cross section area is increased.

now the second semicon layer which is over XLPE on temp rise behaves as conductor and used for dessipating heat out of conductor as the cable heat due to load.

It depends on the resistance level in that area if the soil have low resistance then they will use high impedance system and vice versa..so reason behind this have to reduce fault current.

No. Unless the LED is specifically a laser, you can not make it focus like a laser by putting it in a housing. A laser produces coherent light, which is why it acts like a beam. A normal LED is not coherent, and you can not make it so. Although you can not make a collimated incoherent light beam able to travel similar distances as a collimated laser beam, you can collimate incoherent light into a beam which would travel some distance with a small amount of divergence.

The following is pretty colorful but in reality you will see nothing as the safety equipment stipulated by the electrical code trips the circuit open before any serious damage is done. On a circuit that has tripped on a ground or phase fault the first thing to be done is isolate the circuit using lock out procedure. The trouble shooting equipment used is a megger. Once the fault is located and repaired, the circuit is re fused or the breaker reset, power turned on and an amperage reading is taken. If all the equipment is within the manufactures specifications the circuit is signed of as operational. To quote Billy Mays "KABOOM!". For any two or more phases to make mechanical contact in a three phase electrical system creates the ultimate dead short. This results in an immediate explosion with an arc flash brighter than the surface of the sun and a complete meltdown of the conductors and equipment. Simply put, you don't want to cross phases or allow them to make contact in any single or three phase system. This is the worst thing any electrician can do.

You may or you may not. It all depends on the task you are using the motor. If speed is not a concern for you then you may, but for sensitive systems where changes in motor speed affects the system then you may not. The reason is that the frequency of the power supply affects the motor speed. Frequency is directly proportional to speed.

4.5 Volts

They attacth either end of the bridge to land on either side, then people get in boats and use a ladder to build the bridge part over the sea

Error is deviation in measurement or observation, where the observed value is not the true value. A measurement is usually expressed as a plus or minus value, such as 2.4 +/- .1 Volts. Random error is statistical fluctuation around the true value. Systematic error is a bias, such as miscalibration or consistent error in observation, such as reading a needle type meter from a non perpendicular angle. One example of a systematic error is when reading the peak value of a ballistic galvanometer, that you record the maximum value that the needle crosses, a one-directional error, rather than attempting to interpolate the reading, a two-directional error, but one that gives a better result when many observations are made.

The coulomb is an SI derived unit used to measure electric charge. It is a special name given to an 'ampere second', which are both SI base units.

A TRIAC does not have a symmetrical turn-on point in the opposite quadrant. This will introduce a DC bias, which you probably don't want. You can use an SCR, and then add diodes to allow it to operate in the opposite quadrant, or you can use two SCR's. Alternatively, you can use a DIAC in the TRIAC's gate circuit to balance the turn on point.

A pole core is a word often used in dc machines which provides space for field winding

Yes.... capacitors offer impedance to flow of ac current.. But since the value of impedance is inversly proportional to the frequency of source therefore the impedance offered generally is much lesser than in case of dc current

3r x 300sq.mm Al. ar

UG cable

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Wiring is sized by the amperage that is used by the load. The formula for amps is I = W/E. Amps = Watts (or VA)/Volts. As you can see an answer can not be given unless a voltage is stated. The lower the primary voltage the larger the amperage will be and likewise the larger the wire size will be.

To the load !

Sink - A wiring arrangement in which the I/O device provides current to the I/O module Source - A wiring arrangement in which the I/O module provides current to the I/O device

The wording are confusing an op-amp is an op-amp a comparator is another animal. an op-amp can be used as square wave generator by overdriving it but the results are not desirable. However a comparator will be a switch on-off at the set level.

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no...... ideal open switch should have a resistance of infinity... the question should be a closed switch http://wiki.answers.com/Q/Will_an_open_switch_record_a_resistance_of_zero_ohms" but this is also false because any good conductor will have a small resistance the connecting wire resistance is exhibitted across the terminals of the switch

lowest resistance

I my self ama a studnt of RVCE. In order to get some idea follow dis link below

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Because the little she-its love their electronics.

The ones I worked with had an input of 12 vdc and output 400 vdc.

48 is volt scale and negative voltage is used for safety of media, to prevent attanuation and noise.