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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 color code of a 10 percent tolerance resistor whose conductance is 0.008335?
brown, red, brown, silver = 120 ohms
What are the disadvantages of flip-books?
- because its hard to do as you wish and you must be a pretty good drawer
- you will have to draw the same picture again and again with minor adjustments
- it takes lots of time to make a good flip-book
A beamwidth is the width or angle of a single beam of radiation.
Can extrinsic semiconductor conduct at 0 k?
Normally, no electron energy states exist in the band gap, the gap between the valence band and conduction band in a semiconductor.
However, if we dope the semiconductor, i.e. add donor (n type) or acceptor (p type) atoms to it, we introduce new electron energy states in the band gap!
Take for example silicon, in which we introduce phosphorus, which is a group V element and thus a donor atom. This will introduce extra filled electron states just below the conduction band.
Now, this all happens at 0K, so no current can flow (this is logical as electrons don't move at this temperature, even with an electric field applied). But if we raise the temperature e.g. until room temperature at 300K, the electrons gain energy and can jump into the free energy states in the conduction band. These electrons in the conduction band can now conduct electricity.
maderchod
The reverse KVAR relay protects a generator from a loss of excitation. When the excitation system is lost, reactive power will flow from the system back into the generator. When this happens, induced currents at twice the system frequency will flow in the rotor windings and rotor structure.
Kv and kvar and kva what different?
KV is the unit used for VOLTAGE measurement. AC power is complex quantity that is it has both magnitude and direction and hence has two parts real part and imaginary part. complex power is measured in KVA (kilo volts amps) real part (active component ) is measured in KW (kilo watts) imaginary part (reactive component) is measured in KVAR (kilo volts amps reactive)
How many KVA to impedance heat 100 cubic inches of steel to 2000 in 15 minutes?
In what amount of time?
You can imagine this senario as so: Let's say you have a tank of pressurized water connected to a hose that you are using to water the garden. What happens if you increase the pressure in the tank? You probably can guess that this makes more water come out of the hose. The same is true of an electrical system: Increasing the voltage will make more current flow. Hope that answers you question!
"Memory Failure", as applied to NiCad batteries, is a myth. It was documented by NASA in some of their satellites, but occurred under very tightly controlled circumstances. It does not happen in the practical world. It is more probable that the charger and/or device are improperly designed, as NiCads are very touchy.
NiCad "failure" is probably simply old age. They do have a limited number of charge/discharge cycles, and they are extraordinarily sensitive to overcharge and overdischarge, i.e. reverse charge, so using a resistor to discharge a multi cell battery is not a good idea.
Best approach - buy a new battery.
Why any signal with finite energy will have zero power?
in energy signal power iz zero according to this equation P=E/2T
What is the energy conversion of a bicycle dynamo?
It converts mechanical energy into electric energy.
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Which topology are all devices connected to one another in a closed loop?
An old topology called Token Ring
What is the difference between the current and electricity?
Current specifically refers to the movement electrons through an electric conductor. Electricity is a more general term.
How much resistance does a 4 watt 24 volt dc bulb have?
The answer to this is a bit more complicated than you might think due to the strong positive temperature coefficient of resistance of the filament material.
When operating at its stable temperature (and voltage) this is easy to compute using Ohm's Law and the Power Formula, as follows:
- Power Formula, I = P ÷ E and solving I = 4W ÷ 24V = 167mA
- Ohm's Law, R = E ÷ I and solving R = 24V ÷ 167mA = 144Ω
- Ohm's Law, I = E ÷ R and solving I = 24V ÷ 1Ω = 24A
- Power Formula, P = IE and solving P = 24A * 24V = 576W
At intermediate temperatures the resistance will be somewhere in between these values.
It makes no difference if the bulb is powered by 24VDC or 24VAC. as AC is specified in RMS (root mean square) which is equivalent to DC. It's worth pointing out that, because the resistance of a tungsten lamp varies with variations in voltage, it is considered to be a 'non-linear' or 'non-ohmic' device, meaning that it does not obey Ohm's Law (unless the temperature is constant, but as every change in voltage changes the temperature and the temperature takes time to change following the voltage change making the actual resistance as a function of voltage very difficult to determine).
What is the output voltage of digital receivers?
The output voltage of a digital receiver will vary depending on the design and manufacture of the particular receiver, and the output system used. It is normally quite low, typically between 1 and 5 volts, ranging up to 12 for some SCART connections.
What is an Unstable oscillator?
An unstable oscillator is an oscillator that cannot hold one or more of its parameters constant (e.g. the frequency drifts, the amplitude drifts).
Why negative feed back desire for amplify aplications?
Negative feedback mechanisms are crucial for amplifying applications because they help maintain stability and prevent runaway effects in systems. By providing corrective responses to deviations from a desired state, negative feedback ensures that processes remain within defined parameters. In applications, this leads to improved accuracy and reliability, as the system can adaptively respond to disturbances, enhancing overall performance. Ultimately, the desire for negative feedback in amplifying applications stems from the need for control and precision in dynamic environments.
What is the effects of frequency on RC lag network?
In an RC lag network, the frequency of the input signal affects the phase shift and the output voltage. As the frequency increases, the reactance of the capacitor decreases, causing the output voltage to lag more significantly behind the input. At low frequencies, the capacitor has a higher reactance, resulting in less phase shift and a more significant output signal. Thus, higher frequencies lead to greater attenuation and phase lag in the output relative to the input.
In simple way resistor bank contains number of resistors in series or parallel combination.
They are connected in parallel to decrease the resistance and increase current rating and power dissipation.And they are connected in series to increase resistance and power dissipation.
Why should you never measure resistance in a circuit carrying a current?
Ideally true, but seldom so. The vast majority of resistance meters use current to measure resistance and just use V=IR to give R - the resistor is in a circuit carrying current. The only method that does not have a current through the resistance, it actually relies on the fact, is a Wheatstone bridge. The most important reason for not having a current is that you will be using a current in most cases, to meaure the resistance. Current from another source will screw the reading. Also, with a current flowing, you are not measuring resistance - you are measuring impedance - a combination of inductance and resistance.
The card states it only gains points for cards removed from play by it's effect. Therefore, it only counts the (up to) five cards you remove upon summoning.
