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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 the current in through each resistor?
I=r/v I is the current, r is the resistance of the reisistor and v is the voltage of the circuit
You have it reversed, my friend.
Ohm's law states: I = V/R
How is pulse amplitude modulation transmitted?
Generally pulse amplitude modulation (PAM) is trasmitted as a series of DC levels and are mostly used in wired trasmissions (DC is not effective wirelessly).
What are the examples of open system in block diagram?
Examples of open systems in block diagrams include a simple feedback control system, where the output is not fed back to influence the input, such as an electric heater controlled by a thermostat. Another example is an environmental system, like a river flowing into a lake where water enters and exits without feedback mechanisms. Additionally, a basic supply chain model can illustrate an open system where materials flow from suppliers to manufacturers without internal feedback loops.
What does 50 Hz mean or specify?
"50 Hz" is the shortened form of "50 hertz" which means "50 cycles per second".
50 Hz is the frequency of alternating current (ac) used by national electricity power services in many countries in Europe and elsewhere in the world whilst in USA, Canada and many other countries it is 60 Hz.
A 4700ohms resistor rated as 5watts find out it maximum safe working current?
Power dissipated = I2 R
I = sqrt( P/R ) = sqrt(5/4,700) = 32.6 mA . (rounded)
Note:
It's only "safe" if the power actually dissipates, i.e. doesn't just hang around the resistor.
32.6 mA is 'safe' if the resistor is heat-sinked, or at least out in the open air. It's not safe
if the resistor is wrapped in a cozy blanket.
What is asynchronous and self synchronous demodulation?
Synchronous demodulation is done using the same modulating signals such as cos(2000t) that was used in the transmitter. It still has to use Band-Pass (if multiple signals are present) and Low-Pass filter
If 'x' is an input which then has two conditional outputs p and q.What would be the state diagram?
Its deterministic.
See the diagram here: http://i45.tinypic.com/25hzskj.jpg
here a, b, p, q are states (outputs) and x, 0, 1 are inputs.
What does a bridge rectifier do?
Imagine a rectifier as a valve that only allows electrical current to flow in one direction. When using a single rectifier you end up with half of the wave cycle being cut off (when the cycle turns negative). In many applications a full wave rectifier would be far more desirable. By configuring four of the rectifiers it is possible to make what's called a full wave "bridge".
The link below shows how a full wave bridge works.
http://hyperphysics.phy-astr.gsu.edu/Hbase/electronic/rectbr.html
ANSWER: It will rectify the input into pulsating DC of twice the input frequency minus two diodes drop 1.4 volts
Is it okay to connect 50 hz to 60 hz?
Assuming that you are referring to a piece of equipment designed for 60-hz power being connected to a 50-hz power line (common overseas), It depends on the application. If the load is a DC power supply, they are often rated for both 50 and 60 hz. If the load is a motor made for 60 hz, for example, it will run about 17% slower at 50 hz than at 60 hz due to the design of induction motors, and at higher current because of lower inductive reactance. If the load is fluorescent lighting, it may display an annoying flicker, and the ballasts will probably die an early death. If the load is transformer-powered, you'll have the same current problems as you get with the motor. OTOH, if you want to connect a 50-hz load to a 60-hz supply, it has its own issues. E.g., the motor will run faster and cannot be loaded as heavily. Best bet: research to see if the piece of equipment is rated for both frequencies.
Input impedance is greater than to load impedance?
In electronic gears we use voltage bridging, that is a relative low output impedance to a higher input impedance. Usualy the input impedance is more than ten times higher then the output impedance.
An input impedance is called also a load impedance or an external impedance.
An output impedance is called also a source impedance or an internal impedance.
Advantage of using connecting resistors series in terms of current and voltage?
if resistors connected in series the resistance will increase.Then it limit the flow of current through it. voltage may be increased.
A: by connecting any resistors in series it will limit the current flow it will effect the current but never the voltage applied
What are the primary fore function performed by microproceser?
A: The processes contains three basic functions, arithmetic's, controller, input/output
How do you differentiate FM from PM signal?
A: FM means frequency Modulation meaning the frequency remain the same. pulse modulation the frequency can vary
A full-wave bridge rectifier with 4 diodes gives a dc output voltage equal to the average voltage of the whole transformer secondary. A FW rectifier with 2 diodes and a centre-tapped secondary gives an output voltage equal to the average voltage of half the secondary.
If you have a 12-0-12 transformer, the bridge gives a 24 v output, while the 2-diode FW rectifier gives 12 v (approximately).
