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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
How does coupling capacitor couples two stages in a multi stage amplifier?
A: it could be both coupling meaning eliminate DC from the source or decoupling whereby unwanted signal is bypassed to ground
How embedded systems are used in navigation?
It is used to identify the persons location and to direct persons to other specific direction.
What is heat dissipation in a circuit?
Power isn't really dissipated in a circuit. It's energythat is dissipated. So the expression, 'power dissipation', really means is the 'rate of energy dissipation'.
So, when an engineer asks, "What is the power dissipation?", what he is actually means is "What is the rate of energy dissipation?"
What is energy dissipation? Well, work is done whenever a current flows through a conductor; this increases the internal energy of that conductor which, in turn, causes its temperature to rise. Because the temperature of the conductor is higher than the surrounding temperature, energy is lost to the surroundings through heat transfer.
The flow of negative charges through matter is called?
A continuous flow of negative charges is called an electric current.
What is difference between power station generator and dynamo generator?
- Generating Capacity : Power plant has very high generating capacity as compared to gen set.
- Size of the equipment : Size of the alternators are compatibly very big in Power plants.
- Type of Prim-over : In Power plant turbine is used to for prime over or to provide mechanical power to rotor of the alternator whereas in generating set diesel engine is used for prim-over.
Why Silicon Controlled Rectifier is called current controlled device?
Because it is controlled by the gate current
Why you need to measure insulation resistance?
It is an insulation test to see is the insulation has been injured in any way to cause a short circuit when normal power is applied to it.On the whole megger testing is non destructive. What happens is a DC voltage is applied to the device or winding under test. On my megger there are 3 ranges 300V, 750V, and 1000 volts. Applying the proper voltage is essential to not damaging the device you are testing. Working voltages up to 240 volts should use the 300 range. Working voltages up to 600 volts use the 750 volt range and working voltages above 600 use the 1000 volt range. As you can see if you used the 1000 volt range on a device that had a working voltage of say 24 volts you could damage the insulation just by testing it. So meggering a device is non destructive if you use the tester as its instructions tell you to.
What is difference between micro controller and micro processor?
* Microcontrollers are sub class of Microprocessor. * Microcontrollers are generally target specific. * For example when the application requirement is to capture 2 analog signals, 5 digital signals, store 512 bytes of data, and to place a time stamp (date & time). Ø Here in the case of processor we need a ADC to process the analog signal, ROM (512 bytes or greater memory size) to store 512 bytes of data, RTC (Real time clock) to get present date and time, of course digital signals can be captured using the I/O port pins, and a RAM also has to be added. This makes the size of the PCB pretty big. Ø In the case of controller all these are found inside it, our task is to select the controller based on the requirement. The microcontroller is basically a processor with some special features like ADC, DAC, RAM, ROM, etc., in it.
microprocessor is able to perform all the task done by micro controller but the microprocessor does not have any timers and counters internally for that operations it need the timers and counters from external. but micro controller can perform all the operations
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What do lines represent in an electirc field diagram?
The lines in each diagram represent an electric field. The stronger the field, the close together the lines are.
What are the Basic principles of how the circuit functions?
An electrical circuit is any closed loop that allows a flow of electrons in a current to deliver energy or perform work and then return to their source.
Material along which electrical current flows freely arecalled conductors. (e.g. copper-wire) The electrons emit and return to an energy supply.
Current is said to flow from positive to negative, because this is the conventional direction of current flow. It is a convention leftover from the when electricity was first discovered.
Electrons actually move through a conductor awayfrom the negative terminal and towards the positive terminal, because of the laws governing electric fields (like charges repel and unlike charges attract). The power-supply produces an EMF (electro-motive-force) that creates the potential difference necessary for electrons to flow freely along a conductor.
The natural force is called Electromagnetism.
Opposite charges attract. An electron will move away from a negative terminal and towards the positive.
In physics it is best to think of the current flow in a metallic conductor as being the overall net flow of negative charge since that is what carries energy This movement is known as net current drift and is slow compared to continual random motion of electrons. That random motion yields no overall displacement over time. Therefore power is neither consumed nor created along a current.
In a circuit the electrons flow from what side to what side?
Conventional electrons flow is understood to be flowing from a positive force a less positive force.
What is the difference between diode and resistors?
the resistance of a diode is .4 ohms is made of tantalum or .7 ohms if made of silicon.
ANSWER: THE RESISTANCE OF A DIODE IS SIMPLY V/I the impedance however is defines by Boltzmann constant
A: That is no such a diode but if it exists it will have unlimited reverse voltage capability the forward voltage drop will be zero no matter of current flow and it will remain so regardless of temperature changes
Will wiring a 16 ohm woofer with a 16 ohm tweeter in parallel result in a total ohm load of 8 ohms?
If you mean as pairs, yes.
put an 8 Ohm and a 16 Ohm speaker in parallel for each channel. The 16 Ohm speakers will take 1/3 the power and the 8 Ohm speakers will take 2/3 the power. The resulting impedance will be 5.33 Ohms.
Why using pullup-resistors in 8051 microcontroller?
to determine the state condition of microcontroller's input when microcontroller is reading the input port
What are the applications of hartley oscillator?
hartley oscillators are mainly used in radio receivers.
Also note that due to its wide range of frequencies it is the most popular oscilator
What is different between alternating current and direct current?
Direct current is constant - always in the same direction. Alternating current regularly changes direction; for example, in household current, 50 or 60 times (that is, full cycles) in every second.
See the Related Link below for more information about the difference between alternating current and direct current.
Does thermistor have polarity?
No, they have no polarity. They are just like a resistor in terms of polarity, and they allow to measure temperatures because their resistance varies with temperature in a predictable way.
What is the resistance of a 230v and 10 amp circuit?
You can't really convert that. If you multiply volts and amperes, you get watts, a unit of power. Watts is equivalent to joules/second. If you multiply volts x amperes x seconds, you get joules.
Why is glass a bad conductor of heat and electricity?
To save you time I have answered this question,when i was doing it for homework one
day it took me THREE hours to find it out so...
Glass is a poorer conductor of heat than most metals because it has fewer free electrons.Heat is conducted by particles when they collide or interact ,so with glass having few free electrons it takes MUCH longer (about fourteen minutes!!) to conduct heat than metals do.
Here are my science teachers EXACT words "Metals are better conductors than glass because they have a greater number of free electrons which, besides particles colliding or interacting ,are a second mechanism of transferring heat"
THIS IS THE RIGHT ANSWER!!!!!!!!!!!!!!
So if you are set this question for homework in about year 8 ,then write that quote and you are GUARANTEED to get top marks!
Lots of luv
science boff nowledgegirl.
xxx :)
Do electrons flow through a voltmeter?
The question succeeds brilliantly in avoiding the target cleanly and completely.
Of the three units listed, none is used to measure electrical 'current'. The unit
of current is the "ampere".
What is the difference between ideal and practical diode?
An ideal diode is a simplified model of a diode that does not exist but is used for simple circuit analysis.
A practical diode is the real thing. A model of a practical diode used for circuit analysis purposes includes many parasitic components in addition to the diode.
