Electronics Engineering

A fixed capacitor can be used for power-factor correction for a single-phase ac appliance such as an induction. One of these can also be used to suppy a phase-altered current to the starting winding on the motor.

In electronics fixed capacitors are used in shunt for decoupling, which earths any ac voltages on a dc-carrying wire, or in series for blocking dc and passing ac signals between stages in equipment.

That is just the conventional color of the insulating varnish "mask" used to protect the board. It could be a different color, but green was selected as it contrasts well with copper traces allowing them to be seen through the "mask". Up until the late 1950's, circuit boards were usually brown in color. The brown boards had no "mask" on them, the traces were protected with solder dip. Brown is the color of the paper-epoxy or paper-phenolic board material used.

megger are available in ac &dc

20 GHz

You don't. You have to have the owner's permission to use the WiFi access point. Anything else is theft of services, and is illegal and could subject you to jail time.

Driver IC is device which controls the flow of current through other circuit or other components.

2

Radio, is the transmission and reception of electromagnetic waves.

It can also be the name given to the media industry that sprung up as a result of radio entertainment. e.g. "They got a job in radio".

The first practical means of using radio waves to communicate, was done by an Italian Gugliemo Marconi and he took out a British patent in 1897.

A conductor of electricity is said to be a superconductor if it has some resistance at room temperature but when it is brought down to a critical temperature i.e. to a very low temperature such as -270 oC or so , it loses its resistivity completely.

We have not yet found a substance that works as a superconductor at room temperature but a lot of research is on-going. The aim is to try to find metal alloys or other substances that will behave as superconductors at temperatures which are much closer to room temperature than to absolute zero.

Existing known superconductors are metal alloys which have been discovered to have no electrical resistance when they are at low enough temperatures, typically close to absolute zero i.e. 0 Kelvin or about -273o C.

So "superconductivity" is a property of certain substances at given temperatures, not of any substance at any temperature.

Easy, you just switch it off!

Clarence L. Elder was a scientist/inventor. He was born in Georgia in the year of 1935. He went to the University of Morgan State. He invented the Energy Saving "Occustat".

Wherever there is resistance or conductance and a current generated through interaction of electrons and holes there will be amplification. Trans-resistor is basically transfer of resistance.

A kata thermometer measures the cooling power of the environment; it is used to estimate the personal comfort of workers (see also "heat stress monitor" and "personal temperature monitor"). A spirit-in-glass thermometer is usually used: its bulb is heated to above body temperature, removed from the heat source and allowed to cool. The time taken for the thermometer reading to drop from above to below normal body temperature (e.g., from 38 °C to 35 °C) is used to calculate the cooling power of the atmosphere, using a calibration factor F engraved on the thermometer by the manufacturer: cooling power = F/(time of cooling).

See:

"Measuring personal comfort with the kata thermometer", Am J Public Health, 1924 November; 14(11): 978-979 (available at http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1355066)

and

L. Hill, H. M. Vernon and D. Hargood-Ash, "The kata-thermometer as a measure of ventilation", Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character: Vol 93, No. 651, 198-206

available at http://www.jstor.org/view/09501193/ap000145/00a00030/8?frame=noframe&userID=92405108@csir.co.za/01cce4405e00501c66662&dpi=3&config=jstor

The wavelength of the detected signal.

They are both the same. A wind farm is made up of several wind turbines. So wind farming would be best because it could create a great amount of energy if enough turbines were used.

Actually these systems produce virtually no energy. They are great political units though.

A wind turbine is rated for winds of 28 mph. Almost impossible average. The average runs closer to 14 mph. This produces 10% of the rated power claimed by the utilities. The 10% rated power that is generated is variable as the wind blows faster and slower throughout the day. Fossil fuel plants take long periods to get up and running so these plants are left running while we get power from the wind.

Net result is zero savings, no fossil fuel plant shutdowns and a small increase in overall cO2 produced (manufacturer and maintenance of turbine). Throw in the thousands of birds and bats killed by them they make no sense.

Click the start button.

Type "ipconfig" in the space that says "Start Search" or "Search", and hit Enter.

Look for the section that says Default Gateway. This will tell you your Routers address.

It should be something like 192.168.2.1

Type "Exit", and hit Enter.

DC Voltage

Use a non-contact method such as infrared to measure the drum temperature, or mount a wireless, battery powered temperature transmitter to the drum.

There is no such prefix as deco-. Perhaps you meant deca-? In that case, since there are 10 meters in 1 decameter, and there are 100 centimeters in 1 meter, there are 5000 centimeters in 5 decameters.

Increase or decrease in potential results in the change in direction of the flow of electric current.

A: That resistor is there to limit the current to the LED it can be any value if the voltage is decreased or increased or no resistor if the voltage across the led is equal to the forward voltage drop.

It is stated that one of the voltage is greater in thyristor whether it be forward breakover or reverse breakdown voltage. It is also stated that the greater of the 2 voltages in thyristor is the forward breakover voltage.

Sometimes. The exception is when the capacitor is used as a "timing" device. But 7.5 mfd and 5 mfd are so large that one would guess that they are not being used as timing devices.

A Colpitts oscillator is the electrical dual of a Hartley oscillator. The Hartley oscillator is an LC electronic oscillator that derives its feedback from a tapped coil in parallel with a capacitor. http://en.wikipedia.org/wiki/Colpitts_oscillator http://en.wikipedia.org/wiki/Hartley_oscillator ~MECHASUN~ A Colpitts oscillator is the electrical dual of a Hartley oscillator. The Hartley oscillator is an LC electronic oscillator that derives its feedback from a tapped coil in parallel with a capacitor. http://en.wikipedia.org/wiki/Colpitts_oscillator http://en.wikipedia.org/wiki/Hartley_oscillator ~MECHASUN~