Electrical Engineering

in the IC-7805 i need a meaning for the number 7,8,0,5 seperately

From my results of testing a AAA with 2 different multimeters; the voltage for a bad AAA cell is around 0.85V to 0.86V It will still work in some products that is why it is considered bad and not dead.

230/400 V

These motors can be connected in star to a mains of 400 V between the phases (see figure 1). figure 1 Star connection 400/695 V

These motors should be connected in delta to a mains of 400 V between the phases (see figure 2).

Integrated circuits are comprised of transistors and diodes interconnected in different ways via conductors to perform the desired functions. In some cases resistors may be deposited as part of the circuit.

In a thermal power plant, water is heated in a boiler to produce steam.This steam turns the shafts of a turbine.the thermal energy of the steam is converted into mechanical energy at the turbine.The turbine is coupled with an alternator.In the alternator, the mechanical energy of the turbine is converted into electrical energy.

because coin is made up of insulated metal thats why coin cannot charged

By Megger testing (meggering) of the motor any one can measure the IR of the motor. MEGGER is a device used to measure IR. Analog Megger device may generate 500 volts..it gives coil to coil or coil to body IR value...it should not be less than 2 Mega ohm, generally it should be or kept more than 5 mega ohm...thanks

...DEEPAK RAJPUT

An ammeter measures the electrical current in something. A digital one is calibrated to display through the shunt and convert information from the analog model.

the working principle of single phase induction motor is similar to the three phase induction motor, when we supply is given to the single phase induction motor a revolving field set up in the stator which produces a torqe air gap between north pole and south pole and rotor picks up speed

According to ohms law (V=IR)if voltage is increased the current also increases keeping the resistance same .In other words, to keep values on the both sides of equal sign current must increase with the voltage when the resistance is constant. For example: if R=1 and V=2 then I=2 and if voltage is increased to 4 then current also increases with voltage to 4.CONCLUSION:V IS DIRECTLY PROPORTIONAL TO I KEEPING THE R CONSTANT

It has to do with the load on the amplifier, you can't hear the difference.

One can purchase a low voltage landscape lighting at home depot for a cheap price. One could also purchase one at any warehouse store that would carry lighting fixtures.

P.V.C or polyvinylchloride. It's a plastic.

Core loss is one of the many fixed losses in a transformer.

This means that no matter the loading of the transformer there this loss would be fixed unlike copper loss which depends on the loading of the transformer.

The workpiece is holding on the worktable of the machine. The table movement controls the feed of workpiece against the rotating cutter. The cutter is mounted on a spindle or arbor and revolves at high speed. Except for rotation the cutter has no other motion. As the workpiece advances, the cutter teeth remove the metal from the surface of workpiece and the desired shape is produced.

Actually, the BJT is a positive temperature coefficient device. As they get warm, hFe increases, causing more current flow. This can lead to thermal runaway. That is why most class A common emitter configurations use an emitter resistor to place limits on the hFe demand, eliminating thermal drift and runaway.

Actually, neither d.c. nor a.c. current passes through a capacitor. A.C. current 'appears' to flow through a capacitor but, in reality, it is only flowing through the connecting circuit while what is known as a 'displacement current' (actually, a distortion of the atoms' shells rather than a conduction current) occurs within the dielectric separating the capacitor's plates.

D.C. current is 'blocked' by a capacitor because, when the capacitor is fully charged, the potential difference appearing across its plates is equal and opposite that of the supply. With no net potential difference in the circuit, no current can flow.

All transformers, single phase or three phase have a "no-load current" rating. That is simply the nameplate rating of the Xformer in VA, (volt-amps) or KVA (1000Volt-amps) for larger Xformers. Simply divide the nameplate rating in VA or KVA by the supply voltage and you'll get the Xformers potential maximum output in ampheres.

Voltage is equal to the Current multiplied by the Resistance.
Without changing the resistance, increasing the applied voltage in a circuit will increase current flow. There is a simple, direct relationship between voltage and current. Double the voltage, twice the current will flow. Triple the voltage, and the current will triple. As voltage (E) equals current (I) times resistance (R), when resistance is fixed, what happens to voltage will happen to current.

If a DC series motor is started without load, the armature winding (winding that doesn't spin) current will be at a minimum, resulting in the motor going to maximum speed / runaway, which can cause things to fly apart. As Armature current increases, the speed of the motor will decrease. The armature current will be forced to increase / speed of the motor will be forced to decrease as more and more load is applied.

'High-pot' is short for 'high potential', and it is also the trade name of a high-voltage test set used for testing the integrity of the insulation of high-voltage cables and other equipment prior to putting them into service, or following maintenance.

The power factor of an RLC circuit under resonance is 1.

Explaination:-

Power factor of an RLC circiut is given by=R/|Z|

For a resonant circiut,|Z|=R (Because reactive components are zero in resonance)

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. .Power factor=R/R=1.

Three Phase transformers have three windings. If connected in Delta, it will have R Y B phase winding, voltage between RY, YB and BR. Phase voltage and line voltage are same.

If connected in Star, there will be a neutral as well with RYB. Line voltage and Phase voltage are different. Line voltage = 1.73 x Phase voltage.