Electrical Engineering

EHV - EXTRA HIGH VOLTAGE - STARTING 500 KILOVOLTS IN UP (500,000 VOLTS)

potetial free contacts is a contact of switch or relay that use an external supply, its contact only used to joined tow equipements by electrical supply.

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Yeh buddy! A dc shock is a good shot. An ac shock causes muscles to alternate. Depending on the voltages from either it can be an enlightning experience.

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nathan

A hair clipper is nothing more than an electric motor with a cutting blade attached to it. The motor shaft is usually connected to the blade in a fashion that moves it side to side. One way to do that is by connecting the motor shaft to a wheel, cam, or rod that changes the rotational motion of the shaft to the desired motion of the blade: side to side, up and down, etc. The method commonly used is an eccentric ( a cam lobe ) connected to the motor shaft. The eccentric is then placed into or onto the cutting blade which moves in a guide. If you look close while a hair clipper is running, you can see that the motion of the blade. It moves slightly up and down as well as the desired side to side motion. That is a result of the offset of the eccentric from dead center of the motor shaft as it makes a revolution.

It's a sine wave (if there is no distortion). Voltage is zero at 0 degrees, at its positive peak at 90 degrees, back to zero at 180 degrees, at its negative peak at 270 degrees, and back to zero at 360 degrees.

Power can be found by the following equations depending upon what information you have available.

Power = Voltage x Current ; P=VI

Power = Current Squared x Resistance ; P=I2R

Power = Voltage Squared / Resistance ; P=V2/R

The price per square foot of fiberglass insulation can vary from $0.25 to $0.90, depending on the thickness and R value. Four-inch thick, R-13 insulation probably averages about $0.40 per square foot (in 2009).

A varley loop test is a test used to find the earth fault location in an underground cable. It uses the Wheatstone bridge to help determine the distance from the test point to a fault in a telephone or telegraph line or cable.

Of or to do with a cathode.

An ideal lossless transformer with a primary voltage of 1440 and a secondary voltage of 240 will deliver 4 amperes to a 60 ohm load by ohms law 240 volts divided by 60 ohms causes 4 amperes to flow through the 60 ohm load. The power delivered to the 60 ohm load will be 4 amperes times the 240 volts or 960 watts. The current in the primary is divided by the primary to secondary ratio of 6. Thus, the primary current will be 4 amperes divided by 6 or 2/3 ampere. The power going into the primary will be 1440 volts times 2/3 amperes or 960 watts. In a real transformer there is losses that make the numbers change. The output voltage will be slightly less and the resistance and reactance of the windings lower the output.

Sit you plates in hot water or heat them in the microwave oven if they are microwavable.

p.u value=actual value in any unit/base value in same unit

ICE current leads the voltage by 90 degrees.

the sanskrit word avatara meaning the descent or reincarnation of a divine being in Hindu

THIS CONSIDERATIONS SHOULD BE STRICKLY FOLLOWED: SOUND ENGINEERING AND ACCEPTABLE ECONOMICS; 1.DEFINE DEMAND LOAD - BASED ON ACTUAL SYSTEM VOLTAGE AND PHASE. 2. ONE WAY LENGTH OF CABLE - FT. (AWG) OR MTR. (SQ.MM) SELECTION 3. MULTIPLY BY 125% TO THE CALCULATED LINE CURRENT TO GET AMPACITY REFERENCE 4. LOOK OR SELECT THAT NEAREST RESULT TO ANY LOCAL MEDIUM VOLTAGE CABLE SUPPLIER CATALOGUE OR NEC TABLES AND MATCH IT TO CORRESPONDING CABLE SIZE. 5. APPLY DERATING FACTORS - ALSO AVAILABLE TO NEC OR CABLE SUPPLIERS AND DEFINE THE FF: A. MEDIUM OF INSTALLATION - TRANSMISSION TOWER, PVC OR RSC CONDUIT, CABLE TRAY OR CABLE LADDER OR TRUNKING, THROUGH, ETC. B. AMBIENT TEMPERATURE - INDOOR OR OUTDOOR? C. GROUP FACTOR - CONSIST OF CABLE SPACING AND DISTANCE TO WALL OR INSIDE CONDUIT INSTALLED IN TRAYS OR UNDERGROUND 6. APPLY DERATION IN WHICH RESULT IS LESS THAN ONE (1) TO THE PRE-SELECTED CABLE - THIS IS NOW YOUR ACTUAL FOR SELECTED CABLE 7. DEFINE REQUIRED OR ACCEPTED VOLTAGE DROP IN PERCENT VALUE 8. NOW USE THIS FORMULA: VDapp(APPLICABLE VOLTAGE DROP) = %Voltage Drop x Actual Voltage x 1000 divided by Derated Current x One Way Length x 100 9. THE RESULT WILL HAVE A UNIT OF -- mV/A.Mtr OR MILLIVOLT PER AMPERE-METER 10. NOW COMPARE IT TO AVAILABLE TABLES FOR VOLTAGE DROPS OF CABLES - IF IT IS LOWER THEN SELECT THE NEXT SIZE OR WHICH EVER MEET THE REQUIREMENT.

The voltage was produce by cutting of the magnetic flux by the conductors.

Yes, standard 5V powered DTL and TTL devices are fully input/output logic level and fanout compatible. However DTL chips are nearly impossible to find today. The only thing to be careful about is old DTL based designs often used wired-and gates (i.e. directly tying outputs of several gates together to reduce part count). You cannot do this with normal TTL!

I recommend no smaller than 8 gage wire. 6 gage or 4 gage if you want a professional type cable. The bigger the wire the better, but the more it weighs. 8 gage is sufficient for most people.

IF USING A COPPER AT 105 DEG. CELSIUS - 70 FT. ONE-WAY LENGTH: TO GET AT VOLTAGE DROP = 3.72% AT 25 AMP LOAD ---- USE #1 AWG TO GET AT VOLTAGE DROP = 2.94% AT 25 AMP LOAD ---- USE #1/0 AWG TO GET AT VOLTAGE DROP = 1.85% AT 25 AMP LOAD ---- USE #3/0 AWG

Inductive load will accumulate stored energy. If an attempt is made to open the switch this energy will arc across the contacts of the switch, and could cause damage to the circuit components. Freewheeling diodes are placed across inductive loads to provide a path for the release of energy stored in the load when the load voltage drops to zero.

A transformer is designed to operate at or below a maximum magnetic flux density in the transformer core. Above this design limit the eddy currents in the core and nearby conductive components cause overheating which within a very short time may cause severe damage. The magnetic flux in the core is proportional to the voltage applied to the winding divided by the impedance of the winding. The flux in the core increases with either increasing voltage or decreasing frequency. During startup or shutdown of generator-connected transformers, or following a load rejection, the transformer may experience an excessive ratio of volts to hertz, that is, become overexcited. When a transformer core is overexcited, the core is operating in a non-linear magnetic region, and creates harmonic components in the exciting current. A significant amount of current at the 5th harmonic is characteristic of overexcitation.