Electronics Engineering

Germanium point contact diodes were first created and used during World War 2 as detectors in microwave RADAR systems, as the vacuum tubes available at that time did not operate at microwave frequencies.

Shortly after World War 2 germanium junction diodes were created.

Voltage can be measured using the difference between the potentiel between two ends of wire or by using a volt-meter.

You can easily measure volt by volt or multimeter but remember voltage always measure across the components but in parallel

unitary PLC's are used in standalone systems as the have limited inputs and outputs,

theses are mainly used in small scale engineering companies in operations such as control operations, component counting and sorting.

Yes. It may respond to harmonic frequencies also.

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A 15 amp circuit breaker should trip at 15 amps regardless of the load voltages or impedances. If you have 277 volts and 7 ohms, the current would be 39.5 amps and a 15 amp circuit breaker should trip.

1. piezoelectric crystal vibration generates pressure that ejects ink through the nozzle
2. resistive pulse heater vaporizes a tiny amount of the water in the ink and steam pressure ejects ink through the nozzle

A digital mixer enables one to change live vocal samples, add in previously recorded music or vocals and apply different effects and improvements. The advantage of a digital mixer is that one can do all of this simply, retain different versions along the way and produce a good quality output.

embedded systems are hardware

IT is software

if you are a Bookkeeper you may not see a difference

an electronic engineer would get in the embedded systems as soon as he could

The Civil War in the United States lasted about four years. The fighting started in 1861 and ended in 1865 with the South surrendering to the North.

Actually it is not smoke but water molecules when it is working properly. AIR CON will remove most of the water from a room

never heard of a ac amplifier

MSASM is a good tool

Parallel cables are typically used to connect a printer to a computer. It is a long cord with a broad, flat plug on either end. The recommended maximum length of a parallel cord is 6 feet.

You will see a battery explode. AC & DC do not mix.

it defines the voltage and current ratio.

Bench grinders need to be bolted down to keep them steady. Depending on the type of grinding desired, the small work plates in front of the wheels can be angled to grind at the direction needed.

In a transformer, you increase or decrease the voltage by changing the turns ratio between the primary or secondary windings. Increase the turns on primary, and secondary voltage goes down. Increase the turns on secondary, and secondary voltage goes up.

Note that this usually involves choosing a different transformer, as changing the turns ratio is not something that can be easily done in the field. Some transformers have multiple taps on one of the windings which can be used to change turns ratio.

Transient frequencies are short lasting wave form combination from several sources that produces frequencies that did not originate from the source. For example, there is a 40,000-watt stereo playing really loud techno music out in the woods. The speakers are in a valley that has an echo problem. The echos from the speakers can reverberate in such a way that they blend together and make sounds, often percussive, that were not part of the original music. You can hear this sometimes in corners of music venues too.

By switching circuits or transistors that turn on and off the polarity. This usually results in a square wave output. Then capacitors charge and discharge to smooth out the square wave to resemble the AC sine wave. The better or more expensive the inverter, the closer to an actual sine wave it gets.

All communication systems use electromagentic waves which by the law of Superposition of Waves travel independently in any meadium and hence do not interfere but if the frequencies tend to match then the carrier waves with amplitude modulation are more affected and give poor quality sound at the receiving end than the frequency modulated carrier waves.

It depends on how much delay you want, and also on the frequency. If you just need a few nanoseconds, run the square wave through an even number of series connected inverters. If you need 180 degrees, run it through one inverter. If you need something else, you may need a more complex solution, ranging from an RC coupled schmitt trigger to a digital phase locked loop.

Two types used at microwave frequencies are gunn and PIN diodes.