The term Microwave is a description of a high frequency radio wave in the range of 1 Gigahertz (One million cycles per second) to 40 gigahertz (40 million cycles per second). Radio waves at this frequency have the tenancy to reflect & refract making them useful for a wide number of applications.
Also since the radio wavelength is related to the frequency (frequency in Hertz divided by the speed of light in metres per second equals wavelength) the aerial size for this band is very small allowing for the use of exotic aerial systems such as dishes.
Dish aerials (antenna) are extremely efficient reflectors for microwave transmitters producing point to point links which can operate over many miles. Unlike High low and medium frequency Transmitters, microwave frequencies are not affected by the ionisation of the gas layers in the atmosphere. Therefore they tend to pass straight through the atmosphere rather than being reflected or refracted back to Earth. This makes them very useful for space communications and radio astronomy.
Microwaves do have some problems though. It is relatively expensive to generate high output at microwave frequencies. Also the nature of microwaves is that they do not pass through solid or grounded objects. This means that rain clouds can block the signal. Also at high power, microwaves excite water molecules, causing them to heat up (this is the principle of the microwave oven). Therefore inappropriate use can be hazardous to health.
Microwave are used to locate ships and planes, track weather systems, and determine the speeds of moving objects. They are the principal carriers of television, telephone, and data transmissions between stations on Earth and between the Earth and satellites.
The purpose of the microwave is to heat the food or defrost it with radiation waves! XD :)
the capacitor attached to the motor will be the starting capacitor to allow the motor to start.
the capacitor and its associated resistor set the time constant.
with the help of function generator we found wave in oscilloscope
A: THE EMITTER resistor sole function is to provide stability if it is by passed by a capacitor then this resistance will change due to frequency since as frequency increases the impedance decreases. The total gain will change accordingly
Bypass capacitors are used to bypass (shunt) unwanted signals to the ground. A common use is in power supplies where a bypass capacitor is connected in parallel with the main filter capacitor to shunt noise and other high frequency interference to ground which the main capacitor may not be able to do.
The purpose of capacitor between emitter to ground is to permit the transis tor to function in the depletion region without the elimination of the Q point.
The function of a capacitor in a washing machine is to store a charge. This charge is what starts the washer.
The reactance of a capacitor is a function of -- the capacitance of the capacitor -- the frequency of the voltage across the capacitor
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the capacitor and its associated resistor set the time constant.
It keeps heat from outside the refrigerator from getting into the refrigerator.
To connect it to the circuit.
The main role of dielectrics in capacitors is to increase the value of capacitance of the capacitor.
A fixed capacitor has a fixed capacitance (within certain limits influenced by aging). So it can fulfill any function that a (variable) capacitor fulfills, beside changing its capacitance easily (e. g. by turning a wheel).
In electronic circuits a capacitor is used to pass AC and block DC.
A capacitor is placed across the supply of a fluorescent lamp circuit to correct the power factor
resistor
with the help of function generator we found wave in oscilloscope