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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
Do all electrical and electronic circuits obeys ohms law?
Ohm's law is always true. That's what makes it a law. What trips people up is that resistance is not constant. The law states that voltage is current times resistance. That is true, no matter what. The calculations can become complex, because resistance is not constant.
Another AnswerProbably not. But it really depends on the shape of the characteristic curve for its application (e.g. diode).Despite being fundamental, Ohm's Law is one of the least understood so-called 'laws' in electrical engineering. It applies in so few cases, in fact, that many engineers and physicists argue that it should not be called a 'law' at all!
Ohm's Law is not a universal law, and onlyapplies when the ratio of voltage to current is constant for variations in voltage. This only applies to linear or 'ohmic' devices. Most electronic devices are non-linear or 'non-ohmic' and these include vacuum tubes and solid-state devices, etc. Even some pure metals, such as tungsten, are non-linear -so incandescent lamps, for example, do not obey Ohm's Law.
Ohm's Law only applies to conductors and circuit devices that produce a straight-line graph when current is plotted against variations in voltage. If the resulting graph is curved, then Ohm's Law doesn't apply. Period!
Think about it: if you, say, double the voltage for a curved graph line, the resulting current doesn't double in value -so it can't be obeying Ohm's Law (which states that 'current is proportional to voltage').
Of course, some vacuum tubes and solid-state devices have voltage/current characteristic curves that are partly-curved and partly-straight -in these cases Ohm's Law applies only the the straight-line parts of those characteristic curves, but not to the curved parts. Some devices have 'negative' curves, in which current increases when the applied voltage decreases -clearly these do not obey Ohm's Law, either!
Having said that, for non-linear devices, you can use the ratio of voltage to current (= resistance) to find out what the resistance happens to be for any particular ratio of voltage to current -i.e. at a specific point along their graph line.
AM wave is produced by applying the modulating voltage to the base of a transistor amplifier.
Uses of instrumentation amplifier?
Applications where in-amps may be used include:
1) data acquisition from low output transducers
2) medical instrumentation
3) current/voltage monitoring
4) audio applications involving weak audio signals or noisy environments
5) high-speed signal conditioning for video data acquisition and imaging
6) high frequency signal amplification in cable RF systems
How is a voltmeter wired in with the load?
An inline volt meter is designed to have the voltage pass through it. The wire has to be cut or otherwise disconnected, and the meter installed between the disconnected ends of the wiring.
In an amp What is better high or low signal to noise ratio?
Signal to noise ratio is the difference between the noise floor and the reference level.
How do you tell if a faulty thermistor?
While some people use a much more exhaustive and precise testing procedure, a very simple test can uncover the most common problems with a thermistor:
* measure the resistance of the thermistor at room temperature with an ohmmeter.
If this resistance is 0 (short) or infinity (open), then something is connected incorrectly or the thermistor has been destroyed.
(These are the most common problems).
If that test looks good, then a followup test can uncover nearly all the remaining possible problems with a thermistor:
* put icewater in a ziplock bag and press it against the thermistor. Then measure the resistance of the themistor at freezing.
The two measured values of resistance are usually adequate to identify what kind of thermistor it is.
If both values are practically the same, then it's not really a thermistor -- perhaps someone has accidentally substituted a resistor.
If one or both values are not the expected values,
perhaps someone has accidentally substituted a different kind of thermistor.
What is an antenna used in space for?
Radio waves are a form of electromagnetic radiation, and they don't require a medium to pass through (like water, sound, or seismic waves.) So they work in space, which makes it real handy for astronauts for communicate with each other.
What is the voltage drop running through resistor 1 resistor 1 equals 3 ohms?
There is insufficient information in the question to answer it. You need to provide either the voltage across the resistor, or the power dissipated by the resistor. please restate the question.
Is analog recording better than digital recording?
The digital recording gear is much cheaper and lighter than the analog gear. So everybody can feel like a real sound engineer if one has a sound card - but one can still study "Tonmeister". The sound does not depend on the difference between digal and analog. It comes from excellent playing artists in a room with good acoustics, studio microphones, and a sound engineer with sensitive ears.
Is weathering good for the environment?
NO, it is not good for the environment as it can destroy the earth and will reduce the capacity of water. Soil erosion can also led to land becoming barren as the soil slowly erodes away.
Which is better inverting or non inverting of signal processing?
Hi,
Neither is better than the other. The reason for inverting a signal depends on the next device in the chain or for a specific phasing need in the design.
Maybe you need something to operate opposite of the incoming signal, for instance, when a voltage goes positive, you need it to go negative (or opposite), inverting would be used.
Of course, you can have the option of having both inverting and non-inverting operations at the same time, and can have multiple circuits performing that function.
Form follows function and a designer will do what ever's necessary to make the circuit operate as need requires.
Hope this helps,
Cubby
What are the application of peak detector?
to detect maximum peak os AC signal and convert to DC signal
Why do fluorescent bulbs burn out quickly?
Hi are you getting the right voltage bulbs to low will blow fast a malfuntioing transformer will also aloow to high a voltage to the bulbs or if you live in an area that's prone to voltage spikes
What semiconductor allows current to flow in one direction?
That is a DIODE, which can be of any of these types:
- P-N junction (shown above)
- point contact
- schottky barrier (i.e. metal-semiconductor junction)
Why in mobile communication is the uplink frequency lower than the downlink frequency?
To enable two-way conversations to take place simultaneously. If you use a single frequency, one person has to wait until the other has finished speaking before they can respond. With split frequencies, both people can speak and hear simultaneously - without waiting for the other to stop speaking. It's technical term is 'split frequency duplex'.
What do mean voltage amplification?
It's voltage that's being amplified by a voltage amplifier. Small changes in voltage at the input of the stage cause large changes of voltage at the output of the stage. That larger signal is then coupled out. The stage is said to have amplified the signal, amplified its voltage. And the stage's gain is a measure of how much. This is the simple answer. A further investigation into amplifiers and the underlying ideas in electronics will be needed to take this answer further.
How do you measure speaker impedance?
The real impedance is the resistance in ohms more 20%. A coil resistance of 6,7 ohms X 1.20 = an impedance of 8.04 ohms. If the voice-coil had exactly 8 ohms, the impedance would be 9.6 ohms and the sound would be unclear, tending to more basses.
Why are most homes wired in a parallel circuit rathen than a series circuit?
Series circuits , the voltage is drawn by instruments progressively from source to end whereas parallel circuits give a constant voltage through all the points connected parallel to the source hence the name.In series circuit,the more the power drawn by an instrument,the lesser the voltage available for the next instrument connected after it serially from the source. Hope this solves the question
Can a person die from the voltage of a nine volt battery?
No. The amperage isn't high enough for you to be harmed by it.
No, across the tongue it can't kill you. If someone opened up your chest and put the battery across your heart then you might be in trouble...
Possible. If you have a heart condition, pace maker, etc. then there could be problems any electrical voltage no matter how minor. Also, if the battery touches a nerve close to the surface of your tongue, it can cause other issues.
On top of that, not all batteries are made to specs, just ask Sony. With manufactures farming out to other vendors, they loose track of quality control. A battery that is not to spec will provide the jolt to seriously injure someone.
Because the meter is actually measuring the current through the resistor, and
the two quantities ... current and resistance ... are inversely proportional.
So when the meter measures more current, it has to read less resistance, whereas
higher resistance will result in less current. So the numbers for resistance have to be
printed "backwards" on the meter scale.
Why CB amplifier preferred for high frequency than CE amplifier?
1)in cc configuration we use to get the low output impedence
where as in ce we use to get the high output impedence.
2)in cc amplifier we use to have the voltage gain equal to unity
where as in ce amplifier we use to have the high voltage gain.
3)in cc amplifier there is high power gai which is used for impedence matching
where as in ce amplifier due to the high voltage gain the impedence matching is
less impossible.
