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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
Is the current always the same in parallel circuits?
An example of a parallel circuit would be the light bulbs in track lighting. Each bulb has the same voltage applied. The current through any one light bulb equals the voltage divided by the resistance of the bulb. The current also equals the wattage of the bulb divided by the voltage. So if all the bulbs had exactly the same resistance the current would be the same. However, your question says "always" so in general the answer is no. In the case of track lighting if you had a 60 watt bulb in parallel with a 120 watt bulb, the 60W bulb would draw 1/2 amp and the 120W bulb would draw 1 amp. The sum of the current flowing in a parallel circuit equals the sum of the current in each leg of the circuit.
when A resistance is connected across the supply voltage, total input vooltage will be drop in the resistance when the resistances are connected across the supply voltage, total input vooltage will be devidedacross the resistances. IF R value will be high ,drop also high. IF R value wll be low ,voltage drop will be less.
Name four computer peripherals?
- punchcard reader/punch
- 7 channel 1/2 inch magnetic tape drive
- 9 channel 1/2 inch magnetic tape drive
- fixed head magnetic disk drive
- movable head magnetic disk drive
- modem
- teletype
- CRT terminal
- etc.
What is the value of internal impedance of ideal current source?
internal resistance is always infinite in ideal current source .the internal resistance is in shunt with current source
How real diode is different from ideal diode?
It depends how "ideal" your ideal diode is.
The first approximation of an ideal diode is that it's a device that allows current to flow one way, and not the other way, while doing this with no losses.
The second approximation of a diode implies the inherent 0.7V drop across the device, as well as one way current flow, but with no loss resistance.
The third approximation of an ideal diode is a device which allows current to only flow one way through it, with a 0.7V loss across is, as well as a small internal resistance of a few ohms.
These all vary from a real diode because these are all linear, in every sense. You can neither calculate the voltage nor the current across/through a diode. Instead, you must use the diode's characteristic curve (given on datasheet), and linearize it. You can get any amount of current to flow through the diode the CORRECT direction, by changing the voltage used. A number of microamps will take perhaps, a third of a Volt.
Which coupling gives the higher gain in case of amplifier?
DC coupling on the input/output will always give higher gain because AC coupling involves inserting a capacitor, which adds impedance and augments the signal. AC coupling is sometimes necessary though, for such purposes as eliminating DC offset on the base of a transistor, or eliminating a DC offset in a single supply opamp circuit.
we can measure the resistance if we know the voltage and current passing through a line (V=IR)
How do you make a non-polarized electrolytic capacitor?
Take two electrolytic capacitors of the same voltage and capacity, connect the positive leads together and connect the negative leads to the circuit. Just keep in mind that this will reduce the cap. value by half (2, 1000uF caps = 500uF) Also the voltage of the circuit should not exceed the voltage of one of the caps.
Why must voltmeter be connected in parallel with the circuit component?
Because, by definition, a voltage is the difference in potential between two different points. So the voltmeter must be connected across those points in order to measure that voltage -i.e. in parallel with the points.B
What are the advantages of active filters over passive filters?
Active filters have three main advantages over passive filters:
- Inductors can be avoided. Passive filters without inductors cannot obtain a high Q (low damping), but with them are often large and expensive (at low frequencies), may have significant internal resistance, and may pick up surrounding electromagnetic signals.
- The shape of the response, the Q (Quality factor), and the tuned frequency can often be set easily by varying resistors, in some filters one parameter can be adjusted without affecting the others. Variable inductances for low frequency filters are not practical.
- The amplifier powering the filter can be used to buffer the filter from the electronic components it drives or is fed from, variations in which could otherwise significantly affect the shape of the frequency response.
Are the circuits at homes connected in series or parallel and why?
They're connected in parallel, this is so that everything connected to the circuits will receive the same voltage. Also, if everything was connected in series, if one of the components died, everything would be dead (think of christmas lights)
Kirchoff's Voltage and Current Laws apply to all ac circuits?
Kirchoff's Voltage and Current Laws apply to all AC circuits as well as DC circuits. Other laws, such as Ohm's law and Norton and Thevanin equivalents apply equally as well.
The complicating factor is that, at AC, current and voltage are not usually in phase with each other, unless it is a simple resistive circuit. That makes the math harder, but it does not make it invalid or impossible.
Comparator 1 has a threshold input (pin 6) and a control input (pin 5). In most applications, the control input is not used, so that the control voltage equals +2/3 VCC. Output of this comparator is applied to set (S) input of the flip-flop. Whenever the threshold voltage exceeds the control voltage, comparator 1 will set the flip-flop and its output is high. Ahigh output from the flip-flop saturates the discharge transistor and discharge the capacitor connected externally to pin 7. The complementary signal out of the flip-flop goes to pin 3, the output. The output available at pin 3 is low. These conditions will prevail until comparator 2 triggers the flip-flop. Even if the voltage at the threshold input falls below 2/3 VCC,that is comparator 1 cannot cause the flip-flop to change again. It means that the comparator 1 can only force the flip-flop's output high.
To change the output of flip-flop to low, the voltage at the trigger input must fall below + 1/3 Vcc. When this occurs, comparator 2 triggers the flip-flop, forcing its output low. The low output from the flip-flop turns the discharge transistor off and forces the power amplifier to output a high. These conditions will continue independent of the voltage on the trigger input. Comparator 2 can only cause the flip-flop to output low.
From the above discussion it is concluded that for the having low output from the timer 555, the voltage on the threshold input must exceed the control voltage or + 2/3 VCC. They also turn the discharge transistor on. To force the output from the timer high, the voltage on the trigger input must drop below +1/3 VCC. This also turns the discharge transistor off.
A voltage may be applied to the control input to change the levels at which the switching occurs. When not in use, a 0.01 nano Farad capacitor should be connected between pin 5 and ground to prevent noise coupled onto this pin from causing false triggering.
Connecting the reset (pin 4) to a logic low will place a high on the output of flip-flop. The discharge transistor will go on and the power amplifier will output a low. This condition will continue until reset is taken high. This allows synchronization or resetting of the circuit's operation. When not in use, reset should be tied to +VCC.
Applications of matrices in the field of electronics and communication engineering?
A prime example of matrices (plural) being used in computers if in computer graphics and rendering where matrices are used in 3D work for transformations like rotation, scaling and translations. Although I'm sure there are plenty more fields in computer science where matrices may be used.
RADAR is used for Radio Distance and Direction.
Radar is an example of the fourth real dimension of Quaternion "space-time", real dimension r= ct. Space is quaternion with three vector dimensions Ix, Jy and Kz and one real dimension r=ct. RADAR is a manifestation of this real dimension.
What is a capacitor and how does it work?
A capacitor is an electronic device for accumulating and holding a charge of electricity. It consists of two equally charged conducting surfaces having opposite electrical polarity which are separated by a dialectric insulator.
It is a passive electronic component that stores energy in the form of an electrostatic field.
Another Answer
A capacitor is a circuit component that stores energy. It consists of two, parallel, conducting surfaces, called 'plates', separated by an insulator or dielectric. When attached to a d.c. supply, negative charges are transferred from one plate to the other and, if it is then removed from the d.c. supply, the one plate remains negative with respect to the other.
It's a misconception to say that a capacitor 'stores charge', because the amount of charge on the plates remains the same before and after 'charging'! It is more accurate to say that it stores 'separated charges' but, strictly speaking, it's energy that's being stored.
passive two-terminal electrical component used to store energy electrostatically in an electric field this is an instrument that is used to store charge
capasitor is electronic device his work useful for electronic gadjet and also useful electronic machine ther are six type of capasitor ceramic capasitor:"electrolightic capasitor:"plastic film rasistor:"polishtor film rasistor:"propfylin capasitor:"metalesed capasitor
Why capacitor allows ac and not dc?
CAPACITOR BLOCKS DC SUPPLY .THERE ARE MAINLY TWO ANSWERS
1.CAPACITIVE REACTANCE Xc=1/( 2*3.1416*F*C) , HERE THE FREQUENCY OF DC SUPPLY IS ZERO .HENCE THE REACTANCE VALUE IS INFINITY .SO IT BLOCKS THE DC SUPPLY.
2.CURRENT THROUGH A CAPACITOR IS PROPORTIONAL TO THE RATE OF CHANGE OF CURRENT . BUT IN THE CASE OF DC SUPPLY, THE RATE OF CHANGE OF CURRENT IS ZERO. HENCE THE CAPACITOR CURRENT IS ALSO ZERO.
H.L.kiran
RF signals are generally described as alternating current electical signals with a frequency range starting just above the highest frequency that can be heard, about 20,000 cycles per second, and going as high as 10,000,000,000,000 cycles per second, which is considered to be in the lowest region of infrared light/radiation. These are electrical and electromagnetic signals carried in wire, waveguides, through the air, or in space.
The answer is vague, and so is the question. Here are some examples of everyday RF signals:
10 to 80 KHz range used by governments to communicate with submarines.
90 to 110 KHz signals used by the old LORAN navigation system.
530-1700 KHz band, approximately, as used for AM /broadcast entertainment radio.
3000 to 30,000 KHz (3 to 30 MHz) range of RF signals, commonly called the "shortwave radio band".
27.185 MHz is CB radio channel 19 in the uSA.
88 to 108 MHz as used by FM broadcast radio in the USA.
300 to 500MHz as very commonly used by city, fire, military, and police.
2500 to 30,000 MHz (2 to 30 GHz) used by satellites.
Higher than 50 GHz is mostly experimental and military.
What is the resistance of the circuit if current flow is 6 amperes in a 120-V circuit?
Google Ohms Law. It will give you all the formulas you need to compute Ohms,Volts and Amps. Simple formulas :-)
What is the configuration of cascade amplifier?
In a cascade amplifier, two identical or non identical amplifiers are cascaded ,i.e., connected in series through a capacitor. They are mostly common emitter amplifiers that are cascaded together.The final gain of the cascaded amplifier is the product of the first amplifier's gain and the second amplifier's gain. However, the bandwidth of the cascaded version becomes lesser than the individual gains.
What makes a good electrical conductor?
number of electrons capable of freely moving in the outermost shell of an element. eg. Copper
Disadvantages of RFID:
i. Expensive compared with Bar code
ii. Bulkier, due to embedding of electronic components in the tag. However, with advanced techniques, it is possible to reduce the size, and weight of the tags to a large extent.
iii. Prone to physical/electrical damage due to environmental conditions. For example, tags that are subjected to space exploration may encounter extreme temperatures. The tags required to be designed for a given application, and may be costly when designed for use under extreme environmental conditions.
How does ic 7405 work with pin configuration?
The 7405 is a hex inverter with open collector-outputs, the I/O's is as follow:
Input Inverted output
Pin1=A1 Pin2=Y1
Pin3=A2 Pin4=Y2
Pin5=A3 Pin6=Y3
Pin9=A4 Pin8=Y4
Pin11=A5 Pin10=Y5
Pin13=A6 Pin12=Y6
Power pins
Pin14=Vcc +
Pin 7=GND
