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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
When a parallel LC circuit is tuned to resonance will the current be at a maximum or a minimum?
Inside the circuit loop between the inductor and capacitor the current will be at maximum.
Outside the circuit the current through the LC tank circuit will be at minimum.
It depends on where you are measuring it.
An op-amp is an operational amplifier. It is a type of circuit that takes two inputs and compares them. It amplifies the difference between them by a *very* high gain -- typically 100,000 to 10,000,000 times. That is a sometimes useful in itself, but almost always, op-amps are used with feedback loops. This means that there are external components, usually resistors and sometimes capacitors, to control the way it works. You can get much more useful effects from an op-amp by using feedback loops. The feedback loops are really the key to using an op-amp. Over a wide range, you get very predictable operation from almost any op-amp in the same feedback loop. The differences start to show up at high frequencies, high accuracy, and high power conditions. That's where you look for specialty op-amps. Otherwise, any typical op-amp usually works for a standard circuit. There are two meanings to this question. One is... how many kinds of op-amp circuits are there. The answer is, there are an infinite number, because you make those circuits by building feedback loops around the op-amp to perform various functions. Some examples of the most basic kinds are: inverting amplifier, non-inverting amplifier, summing amplifier, schmitt trigger, comparator, differential amplifier, integrator, etc. The other meaning of this question is, how many kinds of op-amp components as a building block are there. Well, there are many kinds of op-amp available commercially, made by companies like National Semiconductor, Texas Instruments, Linear Technology, Analog Devices, etc. Some of these excel at high-speed operation, some excel at accurate low-voltage operation, some excel at driving power loads with their outputs. Some are low-power. Some use FET inputs. Some use JFET inputs. You can even build your own op-amp from a handful of transistors and resistors, or even tubes and resistors. Go to Digikey.com or Mouser.com and search on op-amps, and see what you come up with. Thousands of different components.
What is frequncy responce of common emitter amplifier?
It is the range of frequencies over which the amplifier works as designed. It is limited at the lower end by coupling capacitors in series with the signal, and at the high end by capacitance in parallel with the signal.
A material through which electrons do NOT easily flow is a what?
An insulator or a dielectric.
AnswerInsulators behave in the way they do because they contain insufficient numbers of charge carriers to support conduction. It has nothing to do with electrons being 'unable to flow easily'!
How many volts in a 500 watt work lamp?
This can be easily calculated with the following formula:
Power = Volts * Amps
To re-arrange to answer you question:
amps = power / volts
amps = 500 / 120 = 4.166 amps.
Or here is an online calculator:
http://www.sengpielaudio.com/calculator-ohm.htm
What is the use of rectifier in dual rail power supply?
One type of diode, the zener, is designed to break down at a specific voltage and conduct heavily when reverse-biased. The zener is normally used as a shunt regulator in series with a fixed resistance. When the reverse breakdown voltage is reached, the zener conducts, and the resulting current flow through the resistance causes a voltage drop across the resistor, lowering (and regulating) the voltage output.
The regulation, while not super accurate and also having a temperature coefficient, is still sufficient for many purposes.
Why series resonance is called voltage resonance?
Series resonance is called voltage resonance because at resonance frequency in a series RLC circuit, the impedance of the inductor and capacitor cancel each other out, resulting in minimum impedance. This causes the total voltage across the circuit to be maximized, leading to a peak in voltage across the components at resonance. This phenomenon is known as voltage resonance because it results in a maximum voltage across the circuit at that specific frequency.
What device to find out a defective light bulb in a series circuit?
To find a faulty bulb in a series circuit, measure the voltage drop across each bulb. The bulb with the highest voltage, specifically the source voltage, is the one that is open.
In the opposite case, when the faulty bulb is shorted, it will have zero volts, while the others have slightly higher than normal voltage.
In the case of series connected Christmas Tree lights, it is a bit complicated because it is hard to measure voltage while the bulb is plugged in.
You could plug each bulb, one at a time, into a working string, or you could measure the resistance of each bulb, looking for infinity. Note, however, that modern series connected Christmas Tree lights are designed to short out when they fail, so it is a simple matter of seeing which one is not lit. (If too many bulbs, however, are shorted, the string will pull excessive current and either all bulbs will fail or the string fuse will blow.)
The equation for parallel circuit is:
1 / X = 1/R1 + 1/R2 + ... + 1/RN
Plug in the known resistances:
1 / 25 = 1 / 220 + 1 / X
Solve for X:
1 / 25 - 1 / 220 = 1 / X
8.8 / 220 - 1 / 220 = 1 / X
7.8 / 220 = 1 / X
X = 220 / 7.8
X = 28.20512821
What is electrostatic focusing in Cathode ray tube?
The cathode ray tube uses a beam of electrons to paint a phophoresent screen. It has to first pass by electrical steering plates. Depending on the voltages on these plates the beam goes as directed. There are systems that use coils.
Why is there a phase difference in common emitter configuration?
The phase shift from input to output is 180 degrees, which is just another way of saying the signal is flipped in polarity. What the phase shift means is that as the input starts going positive, the output starts going negative. The phase shift is due to how the device works in that configuration. Let's say it's operating in class A where the device is never cut off or reaches saturation during a full cycle of the input. The base is static biased to have the device running in the middle of its operating curve. It idles as some nominal value of Ic and awaits an input signal. When the voltage on the input starts to go positive, the device is forward biased even more than it was at idle. As forward bias increases, collector current increases. That's how the device works. Turn it on more, and more current flows through it. As collector current increases, collector voltage decreases. There's the key. Increasing base voltage causes increasing collector current and decreases collector voltage. Increasing base voltage causes decreasing collector voltage. And the opposite is true. That's it in a nutshell. Common emitter configurations phase shift signals by 180 degrees. And now you know how they do it.
What is the proper use of a signal generator?
A signal generator is used to shoot flares in the air from a ships deck. It can launch flares highter than typical flares and can be seen from greater distances.
What is an electric circuit in which the electric charges have only one path to follow?
It is a series electrical circuit.
Where do you use a full wave rectifier?
Right: Example out of a transformer AC to DC
Another Answer:
Anywhere there is AC and DC is required. A full wave rectifier is a circuit that produces a DC pulse using both halves of an AC sine wave - full wave rectifier.
Why voltage gain decreases at high frequency in case of a transformer coupled amplifier?
Depends on the elements used in the circuit.
1.At Low frequency: The coupling capacitors are used to isolate the AC input and output from DC bias conditions for active devices. These capacitors with the input and output impedance of the active device act as a high pass RC filter, hence the gain falls.
2. At High Frequency: The frequency is high, but not as high as the microwave frequencies. There are two reasons
a>The capacitance of connecting wires are connected in parallel the i/p and o/p. When a capacitor is connected in parallel it acts as low pass filter, hence the voltage gain falls. This is when the frequency is high but not high as microwave frequencies.
b> The parasitic capacitance's of the active device are connected in parallel with the i/p and o/p terminals. They along with the device impedances act as low pass filter.
What is difference between 8051 and 8951?
umm 1? lol No, seriously, as explained on www.8052.com, the 8052 has twice the RAM of the 8051 (that is 256 Bytes), an additional 16-bit Timer (Timer 2) and more Special Function Registers (SFR) as required for the additional features. The most essential difference is that Timer2 can be used as a Baud rate generator for serial communication.
What is meant by anode and cathode?
Anode is positive electrode which attracts the negative anions while cathode is the negative electrode which attracts the positive cations during electrolysis.
The total effective resistance of resistors in series is the sum of the individual resistances.
Three 60-ohm resistors in series have a total effective resistance of (60 + 60 + 60) = 180 ohms.
What is Upper trigger point in schmitt trigger?
the point of input voltage at which Q1 begins to conduct
The transistor is a three layer (or two junction) device, emitter, base, and collector (or other designations for variations such as FET's). Each layer is connected to a terminal. Three layers - three terminals.
basically JJ Thomson wanted to find out what a cathode ray was made of. Cathode tubes are a tube with wires in them. Scientists discovered that if the created a vacuum in the tube and sent a charge through the wires, it glowed. JJ Thomson set up a cathode ray and placed magnets on either side. This deflected the ray so the tube didn't glow. This meant the rays were negatively charged which meant they were made of negatively charged particles or electrons.
What term is used to define the number of cycles completed by a signal in one second?
Its frequency, in Hertz.
How capacitor works in electrical fan?
in a ceiling fan the capacitor is used to give the starting torque to motor for run. because we need a rotating type of magnetic field to the motor to run. once the motor run it become running even we disconnect the capacitor. by using the capacitor we produce the electrica difference(phase angle) between the two current taking by capacitor and the motor winding.
