0
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
In a circuit where is the voltage drop?
In a circuit, the voltage drop is located wherever there is resistance. Ohm's law: voltage = resistance * current; so without resistance there can be no voltage drop, with resistance there is.
How do you build a parallel circuit?
BATTERY
+ -
| |
| |
| ----------------------LED-----------LED---------LED---------LED------------
| | | | | |
| | | | | |
| | | | | |
------------------------------------------------------------------------------------------
No the above is a series circuit it would also need a ballast resistor so not to cook your LED's.
This is a parallel circuit-
+---------- ---- ---- ----
| | | |
LED LED LED LED
| | | |
- ---------- ---- ---- ----
It is best to give each LED its own resistor.(not shown)
For some reason when I click save it removes the spaces, ASCII characters have never been good for representing circuit diagrams.
What was life before electronic communication?
The relay was the first electonic- in a sense, component part other than switches and fuses, etc. It made modern telegraphy possible and evolved into the repeater- thus the relay- a remote controlled switch, was in effect the first ( Electronic) device, though not anything involving crystals, diodes, vacuum tubes etc. Morse devised the Relay as part of his telegraph system circa l844.
How is conductivity related to resistance?
It requires a force to propel an object through air, because of the air resistance. Normally, if there were no air resistance and the object were being propelled on the level with no friction, a constant force would accelerate the object steadily. However, it would require a steady force to propel the object through air even without acceleration. And the faster it went the more resistance it would meet.
Can you run 4ohm resistor to make 4 ohms speakers 2 ohm?
Yes, you can safely use a 4 ohm amp with one 8 ohm speaker, but you will not achieve full power.
The 4 ohm amp is designed to supply a certain voltage into a 4 ohm speaker. Supplying that same voltage to an 8 ohm speaker will result in half the power, or -3dB. For maximum power, use a 4 ohm speaker, or two 8 ohm speakers in parallel.
What would happen if your household circuit was set up in series circuit?
First, you will need very high voltage to run them altogether.
Second, short circuit will be extremely hazardous in your house due to high voltage.
Thirdly, you can't switch off the light without off the heater or air conditioning.
Is a Resistor a nonlinear device?
It is a linear device if it is not a wire wound resistor. These become non linear to AC at high frequencies because of their inherent inductance.
What is the resistance of four 8 ohm speakers wired in a series?
Two 8 ohm speakers in parallel is 4 ohms, and the power will be split between them. However, unless the amplifier is rated for 4 ohm operation, you will not get the same total power out of the amplifer as you would with an 8 ohm load.
Operation of two cavity klystron amplifier?
The power gain of a two cavity klystron amplifier is about 30 dB.
In order to achieve higher overall gain, one way is to connect several two-cavity tubes in cascade, feeding the output to each of the tubes to the input of the following one. Besides using the multistage techniques, the tube manufacturers have designed and produced multi cavity klystron to sere the high-gain requirement.
In a multi cavity klystron each of the intermediate cavities, placed at a distance of the bunching parameter X of 1.841 away from the previous cavity, acts as a buncher with the passing electron beam inducing a more enhanced RF voltage than the previous cavity, which in turn sets up an increased velocity modulation.
A microphone is a device that converts sound as acoustical pressure waves into electrical
voltage waves. All microphones have a diaphragm, membrane, or other mechanical elements in them that vibrates sympathetically in response to the arriving acoustic wave fronts. This mechanical element acts on the electrical element to generate audio voltage.
The sensitivity of a microphone is shown in voltage per sound pressure (mV / Pa) that show the proportionality of the audio waves to the pressure waves.
To amplify sounds (make louder), the vibrations of the connected speaker's surface must increase in amplitude.
What happens if there is too much current in the circuit?
It causes the disruption of the fuse, switching off the disjunctor, or set on fire the conductors if there isn'ta circuit protector and therefore burns the parts of the electric device. The cause of too much current in a ciucuit is always a resistance that has a low value. To check the cause of the excess of current in a circuit is necessary to measure all the components.
What is difference between analog and digital communication system?
Analog systems are what we can call wave systems. they have a value that changes steadily over time and can have one of an infinite set of values in a range.
The term digital refers to the fact that the signal is limited to only a few possible values. in general, digit signals are represented by only voltages on a wire -0 volts ( which we called " binary o " or just "o" ) and 5 volts ( which we call " binary 1 " or just"1" ).
What are the application of a thyristor?
The industrial applications of a thyristor are:
- To trigger a triac
- To produce gate signals
- to be used for controlled rectification
Power dissipation of a resistor or any load is the amount of power (in watts) that is converted to heat, light, or other form of energy. In a resistor, power dissipation is defined by Ohm's law P = I^2 * R Power dissipated equals current through the resistor squared times the resistance in ohms. Since the power is converted to heat, a resistor has a maximum dissipation rating set by the manufacturer, above which the resistor will be damaged.
What are some of the different designs of wind turbines?
country side wind turbines and modern turbines
If an electrical current passes through a conductor what two things are generated?
If an electrical current passes through a conductor, there is an induced voltage (because no conductor has perfectly zero ohms), resulting in power dissipation, and there is a magnetic field, which can interact with other conductors in the vicinity of the first.
When secondary coil is open there is no current in the primary coil WHY?
I am assuming the question is about the power / distribution transformer and not the current transformer.
The primary current is a function of load connected on secondary. With the open secondary, there is no load, no current, it is open circuit. Hence no primary current.
However there is always some small amount of no load current in the primary winding.
What is three phase transformer?
A polyphase system is a means of transmitting ac power and it has N live wires with the currents phased by 360/N degrees between them. This arrangement when N is 3 or more needs no neutral wire because the return current for each one of the N wires flows back along all the other live wires.
The world-wide standard for electric power transmission uses N=3 and is called 3-phase. Power transmission needs 3 wires when the the three currents are balanced (equal) and 4 wires in other cases where the load currents might not be equal, in which case current flows in the neutral fourth wire.
Transistor is a semiconductor device used for amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit.
What is break down voltage of diode 1N4001and 1N4007?
As reverse voltage is applied to this rectifier it will at some point breakdown whereby massive current can flow in the reverse direction. This current is called saturation current . These rectifiers are very common they start at 50v to 1000v breakdown voltage the last 1n400x 2n400x are the number designated as reverse voltage potential 1n4001 isis the lowest voltage
How do you calculate total resistance in parallel?
In words: The total conductance is the sum of the individual conductances. Since conductance is the reciprocal of resistance:
1/R = 1/R1 + 1/R2 + 1/R3...
where R is the combined (or equivalent) resistance, and R1, etc. are the individual resistances. In other words, you first take the reciprocal of the resistances, add everything up, then (to get the actual combined resistance), you take the reciprocal again.
Sample calculation: resistances are 2 and 3 Ohms.
1/R = 1/2 + 1/3
1/R = 3/6 + 2/6
1/R = 5/6
R = 6/5 or 1.2
What three values in an electrical circuit are connected by Ohms law?
Ohm's Law simply states that, under certain circumstances, the current (I) passing through a circuit is directly-proportional to the potential difference (U) applied across that circuit.
So, strictly speaking, Ohm's Law, relates just twoquantities: current (expressed in amperes) and potential difference (expressed in volts).
The ratio of potential difference to current is, of course, resistance (R). So, by extension, Ohm's Law can be written as R = U/I. But, strictly speaking, resistance is not mentioned in Ohm's Law.
However, it must be realised that Ohm's Law is NOT a universal law; in other words, it does not apply in all circumstances. In fact, it does not apply to a great many electronic devices, such as diodes, etc. In fact, it only applies to pure metal conductors provided their temperature remains constant for variations in voltage.
What is meant by the term short circuit?
When a wire is cut in a circuit, a gap is made and the current can no longer circulate, known as an open circuit.
When 2 parts of a circuit touch, that shouldn't, for example - a wire comes loose and comes into contact with another part of the circuit, its shortening the route of the current in the circuit. So its a short circuit. When this happens 99.9% of the time the result will be a spike in amp's, so tripping any circuit protection, MCB's, fuses.
A good example of a common short circuit is faulty windings on a 3-phase electric motor. If the resin separating the windings becomes damaged it can cause 2 or even 3 of the motors phases to come into contact causing the motors overload protection to trip.
