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Electronics Engineering
Electronics Engineering is a branch of engineering that deals with practical applications of electronic components, devices, systems, or equipment. Electronics are devices that operate on low voltage sources, as in electron tubes, transistors, integrated circuits, and printed circuit boards and use electricity as part of its driving force.
24,372 Questions
What is an Ultra sonic sensors?
A Ultra sonic sensor is like a very small speaker (usally of the piezoelectric type) which is able to sense Ultra sonic frequencys, these frequencys are above the normal hearing range of human hearing, in the range of bats and cats and dogs tho,
in some car alarms a sonic transmitter and sensor is used to detect a intruder or if the windows have been smashed, this uses two sonic devices (speakers) one as a transmitter and one as the receiver, the transmitter gives out sonic pulses which are received by the sensor, the electronics process the signal being received by the sensor which will be slightly diffrent than the transmitted signal due to materials in the car absosorbing and reflecting the sonic pulses, however if a window is broken or sombody enters the car the sonic pulses being received by the sensor will change again due to the new object in the car changing the absorbton or reflecton of the pulses this then leads to the alarm been activated
ultra sonic sensors and receives are used for may other things to like mapping the seabed or lakeb
A Ultra sonic sensor is like a very small speaker (usally of the piezoelectric type) which is able to sense Ultra sonic frequencys, these frequencys are above the normal hearing range of human hearing, in the range of bats and cats and dogs tho,
in some car alarms a sonic transmitter and sensor is used to detect a intruder or if the windows have been smashed, this uses two sonic devices (speakers) one as a transmitter and one as the receiver, the transmitter gives out sonic pulses which are received by the sensor, the electronics process the signal being received by the sensor which will be slightly diffrent than the transmitted signal due to materials in the car absosorbing and reflecting the sonic pulses, however if a window is broken or sombody enters the car the sonic pulses being received by the sensor will change again due to the new object in the car changing the absorbton or reflecton of the pulses this then leads to the alarm been activated
ultra sonic sensors and receives are used for may other things to like mapping the seabed or lakebeds, thay can tell you how deep a lake is by calculating the time it takes for the sent signal to be received by the sensor, also diffrent materials absorb the signal in diffrent ways so a good idear can be made of what the material is made of, also due to the high frequency of sonic waves it can be used to clean things by vibrating the dirt of them, eg sonic toothbrushs, cleaning dentist equipment etc
anyway i hope this answered your question!
How do you calculate power factor if line voltage and line current are measured from motor terminal?
Power factor is the ratio of true versus apparent power. For example, a power factor of 1 means that one watt of measured power is one watt of real power, while a power factor of 0.5 means that one watt of measured power is two watts of real power.
To measure power factor, measure voltage, current, and the phase angle of current related to voltage. Phase angle is between 0 and 360 degrees, 360 degrees being one line cycle.
A power factor of 1 means that the phase angle is 0 degrees.
A power factor of 0.707, assuming that voltage and current are measured on the same scale, means that the phase angle is 45 degrees. It would be +45 degrees for a capacitive load and -45 degrees for an inductive load. You can use trigonometry, sines and cosines, to figure this out, or you can use the pythagorean theorem to figure this out - its just a right triangle where the angle is the phase angle.
By the way, a power factor of -1 means the load is actually a generator, and a power factor of 0 means the load is a pure capacitive or inductive load with a phase angle of +90 or -90 degrees.
Power factor is a concern because watt-meters measure apparent power. If the power factor is too low, it will seem that the energy used to lower than reality. The problem is, even in the worst case of + or - 90 degrees, energy is still required to move the current back and forth in the circuit, and that energy must come from the power supply. That's why we talk volts-amps (VA), volts-amps-reactive (VAR), and watts (W) in AC circuits, and none of them are the same thing.
What is the difference between omnidirectional antenna and smart antenna?
An Omnidirectional antenna generates a beam in all directions and is defined as one "having an essentially non-directional pattern in a given plane and a directional pattern in any orthogonal plane".
A Smart antenna however, often referred to as an adaptive antenna, utilises adaptive DSP based techniques and digital technology. The original analogue signals must be converted to digital form through the use of digital converters.
Consequently, the nulling of a given interference and the steering of the main beam to a known direction can be achieved by changing the phases and amplitudes of the signals in individual elements of the array.
What is the difference between radar identification and radar contact?
Radar identified refers to your aircraft's position presented on a ground based radar screen and by using a squawk code in the aircraft which corresponds to the ground based station your aircraft is then identified.
Radar control refers to an aircraft already identified on the radar screen and flying in controlled airspace under an IFR flight plan and the ground based station would provide heading, speed and altitude you should fly at.
How do you use OP-AMP as common compensator?
i know that an op amp can be used as an amplifier and a switch, but i want to have more uses of the component or device.
How do you calculate downlink frequency by uplink?
You would need to know the LO frequency from the satellite.
Ex- C-band is 2200Mhz
If you UL is 6.0GHz you DL would be 3.8GHz
What are reciprocal circuit elements?
Reciprocal circuit elements are those elements/circuits in which power loss/gain is same at both nodes/ends.In these types of circuits we can check the circuit or connect it in any way.
What do you mesure the answer of Ohm's law in?
Ohm's law can be used to find the current, voltage or resistance in a electrical circuit.
The formula is V=IR
where 'V' is the Voltage measured in Volts (V),
'I' is the current measured in Amperes (A)
And 'R' is the resistance, measured in Ohms (Ω)
How are radio waves used to find the speed of a moving object?
By using an phenomenon called the Doppler Effect, which causes waves (e.g. radio, light, sound) that are reflected off a moving object (or emitted by a source on a moving object) to shift frequency proportionally to the speed of the object.
- if the object is moving towards the observer the waves shift to a higher frequency
- if the object is moving away from the observer the waves shift to a lower frequency
For objects that emit the waves themselves (e.g. stars, galaxies) it is necessary to find spectral lines of known elements or compounds and measure how much the frequency of these spectral lines have shifted from their known standard frequency. If sound waves emitted by a vehicle (e.g. train whistle) you must somehow know the frequency of the sound source on the vehicle when it isn't moving (this may or may not be possible).
This sounds like highschool physics homework. The answer is simple ohms law and algebra. The short answer is Voltage = Current x Resistance. If you know two things you can find the third.
To be honest, this is a simple question and your book or Wikipedia can tell you. Just solve for the unknown.
When you require dc source it is preferable to use a dc power supply instead of a battery why?
It depends on where the power source is needed. In portable equipment for starting engines or portable equipment like cordless saws, drills, or lights a battery is the preferred method of power. In indoor stationary charging equipment for portable phones for example a continuous supply of AC power being converted to DC is more convenient than have batteries around the home that have to be charged when running low on voltage.
Is there another season of monochrome factor?
There is not a second season of monochrome factor at the moment, but I'm hoping that they will make a new one, and soon :D
What is the function of a capacitor in the half wave rectification?
to smooth the output of the half-wave rectifier from 1/2 an AC cycle per period to a constant voltage.
Give the definition of output offset voltage of Op-Amp?
The output voltage of a opamp when the input of inverting and non inverting terminals are grounded
What is the virtual value of ac whose peak value is 707V?
virtual value=peak value/root 2
=707/1.414
=500
A: Practically all of the bridges used to find the value of passive components uses a null signal to determine the value In reality null means the lack of a signal where it is virtually eliminated when that occurs that is the null or no signal.
