Electronics Engineering

The formula you are looking for is I = W/E. Amps = Watts/Volts.

To get Watts you multiply Amps x Volts. So in your case you just do some reverse math and divide the Watts by the volts and you get your amperage.

so 100/120=0.83 Amps

I think it is to determine how powerful you have to make your power supply to run the current demand load continously with a margin for error on the plus side. A 12 volt car battery has a low load resistance and needs some heafty components in a battery charger. A charger (or supply) for a 12 volt boom box with a high load resistance may be the size of a small paper cup. They both supply 12-15 volts but the load resistance is very much different E=IR I=E/r R=E/i

No way of telling. to get amps you have to have a current flow, which you get when you connect a consumer to an outlet. Then the consumer will pull amps according to its wattage rating (Watts / Volts = amps) - assuming it's all hooked to a fuse with enough rating.

flux acts as a wetting agent in the soldering process, reducing the surface tension of the molten solder and causing it to better wet out the parts to be joined.

The 555 timer IC is a device that can create various kinds of time delays in a circuit. It uses a threshold pin that is typically connected to an RC circuit. Depending on how it is connected, it can operate in one shot mode (monostable), astable mode (retriggerable), or schmitt trigger mode.

Current is defined to be a flow of electrically charged carriers. These are usually electrons or electron-deficient atoms. It is symbolized by uppercase letter I.

The invention of the capacitor varies somewhat depending on who you ask. There are records that indicate a German scientist named Ewald Georg von Kleist invented the capacitor in November 1745. Several months later Pieter van Musschenbroek, a Dutch professor at the University of Leyden came up with a very similar device in the form of the Leyden jar, which is typically credited as the first capacitor. Since Kleist didn't have detailed records and notes, nor the notoriety of his Dutch counterpart, he's often overlooked as a contributor to the capacitor's evolution. However, over the years, both have been given equal credit as it was established that their research was independent of each other and merely a scientific coincidence.

The Leyden jar was a very simple device. It consisted of a glass jar, half filled with water and lined inside and out with metal foil. The glass acted as the dielectric, although it was thought for a time that water was the key ingredient. There was usually a metal wire or chain driven through a cork in the top of the jar. The chain was then hooked to something that would deliver a charge, most likely a hand-cranked static generator. Once delivered, the jar would hold two equal but opposite charges in equilibrium until they were connected with a wire, producing a slight spark or shock .

Benjamin Franklin worked with the Leyden jar in his experiments with electricity and soon found that a flat piece of glass worked as well as the jar model, prompting him to develop the flat capacitor, or Franklin square. Years later, English chemist Michael Faraday would pioneer the first practical applications for the capacitor in trying to store unused electrons from his experiments. This led to the first usable capacitor, made from large oil barrels. Faraday's progress with capacitors is what eventually enabled us to deliver electric power over great distances. As a result of Faraday's achievements in the field of electricity, the unit of measurement for capacitors, or capacitance, became known as the farad.

Its used in collector amplitude modulation,Radio frequency recievers ..etc

reactance and resistance are both measured in ohms because both are opposition to current flow. the only difference is resistance is the real component while reactance is the imaginary component.

the motor should only rotate in a rated speed,if the speed is more than rated speed then the motor will be damaged........to control the speed of motor a rheostat should be connected to the field side of motor......by variying the rheostat we can control the speed of motor......

Coulomb is a measure of electric charge:
One coulomb is the amount of electric charge transported in one second by a steady current of one ampere.

http://en.wikipedia.org/wiki/Coulomb

The section we call 'radio'.

Of course, there's no end to the electromagnetic spectrum, at least not on the

low-frequency end, so there's really no such thing as "greatest" wavelength.

As frequencies go down past radio and below, wavelength just keeps getting

longer ... the bit of radiation from the 60 Hz utility power lines has a wavelength

of almost 5,000 kilometers ( ! ! ). But we don't use anything down there in the

form of radiation ... antennas would need to be gigantic in order to be the least

bit efficient ... so there's no popular name for the radiated form.

The 'generic' answer to the question is: The type with the lowest frequency.

it conducts in only one direction. it can also be used as a switch and made to not conduct at all.

Yes, it can. Then you can use the charge to power something else. :)

is a system of equipment used for microwave data transmission.

A half wave rectifier conducts on every other cycle. The output is a train of half sine cycles, at a period equal to the input period. At 60 Hz, the period is 16.7 ms. Each half cycle (8.3 ms) will be interleaved with periods (8.3 ms) of no voltage. If you filter the output with a capacitor, you get DC - at no load, the DC will be the peak value less the forward bias voltage of the diode - at some load, the DC will fluctuate between that peak value and some value dependent on the size of the capacitor and the current draw. Again, the period (of this nearly sawtooth waveform) will be the input period.

A full wave rectifier conducts on every cycle. The output is a train of half sine cycles, at a period equal to half the input period. At 60 Hz, the period is 8.3 ms. Each cycle (8.3 ms) will be connected to the preceding cycle with no intervening delay. Each cycle will pulse in the same direction, instead of in alternating directions. If you filter the output with a capacitor, you get DC - at no load, the DC will be the peak value less the forward bias voltage of the diode - at some load, the DC will fluctuate between that peak value and some value dependent on the size of the capacitor and the current draw. Again, the period (of the nearly sawtooth waveform) will be half the input period.

Since the full wave output waveform is twice the frequency (half the period) of the half wave output, the capacitor can be about half its required value for the half wave circuit in order to achieve the same level of filtering.

A: Noise effect an analog signal by adding or subtracting from the signal

the current value at any part of the circuit is dependent upon the circuit conditions and not the ammeter. The meter will simply allow you to read those currents, whatever they may be.

who knows 30kva means 30000 volts per ampere so if the output is 100 volts the amps will be 300 amps so do the math.

89c51 microcontroller is of the series of 8051,one of oldest yet commonly used microcontroller.89c51 have the less complex features then other microcontroller and it is also easily available and cheap in comparison of other microcontrollers.

Diodes are used for a number of different purposes. Its most common function, however, is to act as a semi-conductor in a variety of commonly used household appliances.