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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 ampere rating of a computer?

Computers are dynamic components there fore if just plain sitting there the power is minimum if really crunching data or working the power will surely increase greatly. Computer are never rated in amperes but Rather watts dissipation

What voltage does a Resistor temperature detector put out?

None. An RTD is a passive device. It changes resistance as the temp varies. Your circuit must basically measure the resistance to determine temp. There are many different types of RTD's, each with it's own temperature curve.

Why there is no femous female scientist. like femalous male scientist such as entisine newton galelio jabir?

As you know females sometimes they do not like to do all those kind of man stuffs to me. I guess this is the answer for yours.

Why op amp circuit without negative feedback so unstable?

I f an amplifier has a great gain lets say 1000 and the power supply is 10 v then 10 mv will saturate the amplifier to either rail some amps has 10mv just in offset voltage

What is the current called that is delivered by a power supply?

It's called, `current`. It's rated in amps, milliamps, microamps, etc., representing a fraction of an amp.

The simple explanation is that the voltage is the `carrier`, and the current is the `power` which actually provides the energy to do the work.

Circuit used to convert pwm to ppm?

the pwm output can be converter to ppm by passing pwm through a monostable multivibrator with a low stable state and high quasi stable state and which is negative edge triggered.

What is the primary purpose of the schematic diagram?

The schematic diagram is a Road Map of the electrical circuits of a device. It is the most important and most helful piece of information available to help track down a problem in that device. You need plans to erect a building so do you need a schematic diagram to build a electronic circuit

Theory of coupled circuit?

Mutual inductance is the basic theory of the coupled circuits.

Multiplication of 6-byte numbers in 8085 assembly language?

You may be able to find a multipication operator in your assembler instruction set, but for something this basic, I would recommend developping your own specialized version using shift registers and addition - this will be much more efficient in clock cycles as opposed to a canned multiplier.

Definetion of nyquist rate in digital communication?

if the sampling rate is twice that of maximum frequency component in the message signal it is known as nyquist rate

How do you increase the length of leads of a capacitor?

You increase the length of leads of a capacitor by splicing extra length onto them.

What is hard switching?

hard switching is a switch which can be purchased in a hardware shop...

properties:

it is hard

it is not soft

it is very compact

it is not a eatable

it is not advisable for children under age 5

When fully charged the voltage across 2 microfard capacitor will be?

Regardless of the microfarad value of a cap(s), the total voltage of the circuit will equal the available voltage available. I.e. 10V applied to several (or one) cap'(s) will eventually reach the available voltage (Source). This is due to the fact that a cap is not resistive, or inductive.

Why the pilot exciter having high frequency in electrical generator?

I'm no expert but I believe the high frequency is due to the number of poles (North-South) of the pilot exciter. The frequency of a generator is directly link to its speed and the number of poles. Most generators will run at 1800RPM and will have 4 poles to achieve 60Hz. The pilot exciter being on the same shaft will also run at 1800 rpm but will probably have more then two poles. finding the formula for frequency of a generator should help you in answering your question.

The next question should be why would you build a pilot exciter with multiple poles and a high frequency? The output of the pilot exciter is going to be rectified to DC so it would make sense to do it with a high frequency and get a smoother DC signal out of the rectifier.

I don't understand. What are anodes and cathodes Positive or Negative I keep seeing different answers everywhere Thanks.?

It can be complicated depending on the type of cell one is looking at. However, here is my simple explanation.
The anode is the electrode where the oxidation reaction takes place, and oxidation is the loss of electrons, so in a galvanic cell the anode is a source of free electrons and so it is negatively charged.
The cathode is the electrode where reduction takes place, and reduction is the gain of electrons, so in a galvanic cell the cathode is positively charge and ready to accept negatively charged electrons.Now, the anode isn't always negative and the cathode isn't always positive. It has to do with the direction of current flow (anode = current in, cathode = current out). In an electrolytic cell, the charges on the anode and the cathode are reversed from that seen in a galvanic cell.


For series R-L-C circuit the load will be capacitive if the frequency is?

Load of a series R-L-C circuit is given by R+j(XL-XC).

where R=resistance,XL=reactance,Xc=reactance.

Load will be capacitive if (XL-XC)<0.

or, XC>XL

or,1/(wC)>wL

[w=2*pi*n where n=frequency,C=capacitance,L=inductunce]

therefore

n<1/(2*pi*sqrt(LC))

Prove that the capcitor will be open circuited when the dc source is applied?

A capacitor will appear to be an open circuit to a DC source, but only after equilibrium is reached.

Proof:

A capacitor resists a change in voltage. The equation is ...

dv/dt = i/c

... which means that the rate of change of voltage in volts per second is equal to current in amperes divided by capacitance in farads.

A DC source has constant voltage. If you charge a capacitor to a constant voltage, then, at equilibrium, dv/dt is zero. This means that i must also be zero, since c is not zero.

Ohm's law states that resistance is voltage divided by current. The limit of this is that, when current is zero, then resistance must be infinity. Therefore, the capacitor will have infinite resistance and appear to be open circuited.

What is multi emitter transistor?

A bipolar junction transistor with 2 or more emitters. The most common use of these was in the input section of transistor transistor logic (TTL) gates. They offered significantly higher speed and used less area on the IC chip than the diodes used in the input section of the diode transistor logic (DTL) gates that came earlier. This made TTL ICs both faster and cheaper than the DTL ICs which soon became obsolete.

How can someone use your telephone number in which to call you?

When your phone number is dialed by someone; either by pulses (rotary dial), touch tones (pushbutton dial), or digital coding (cell phone); the number is captured and decoded by equipment at a central office. The decoded number is sent to call switching equipment at the appropriate central offices (and if its a long distance call to call switching equipment at the appropriate long distance call management offices) needed to connect the call through. Once connected the central office sends a 120VAC 5Hz ring signal to your phone (or if your phone is a cell phone a digital ring command), causing your phone to ring. (Note: the ring the caller hears has nothing to do with this, it is a simulated ring generated by the central office at his end.) If your phone is picked up, the ring signal is removed, the call circuit is completed at both ends, and billing (if appropriate) begins.

Why will your DC espresso not work with AC adaptor?

is this an espresso maker for a car?

if so its a pretty large heating element and will need 12v at about 30A

it doesnt matter if its dc or ac to power the heater

the ac espresso makers are around 1000w and will make more faster

heating appliances need lots of power and dont care about ac or dc

its easier to get one in the correct voltage