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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 a vacuum tube that contains a grid called?
- one grid - triode
- two grids - tetrode
- three grids - pentode
- four grids - hexode
- five grids - heptode, pentagrid converter
- six grids - octode
- seven grids - nonode
- etc.
What is the difference between a CB amplifier and CE and emitter-follower?
Emitter-follower or common collector amplifiers are used to match impedances, or to amplify power or current. The emitter-follower is a type of common emitter circuit that has a resistor between the emitter and ground. The output signal is taken from the point between the emitter and its resistor.
If voltage remains constant and resistance decreases current flow?
the current will increase because of a lower level of resistance , hence more current will flow- easily
What is meant by wattless current?
Current flowing through an ac circuit in which power consumed is zero is called wattless current.
What is the difference between voltage forward voltage and voltage drop?
Voltage is the potential difference between the source & any point in the circuit.
The forward voltage is the voltage drop across the diode if the voltage at the anode is more positive than the voltage at the cathode (if you connect + to the anode).
Voltage drop means, amount of voltage by which voltage across load resistor is less then the source voltage.
What are series circuits useful?
Christmas tree lights and computer cables are also connected in series.
When a conductor cuts magnetic flux an emf is induced in the conductor. This is known as?
faraday law
What is the potential difference if a resistance is 25 ohms produces current of 250 amperes?
E = I * R = 250 * 25 = 6500 volts
This resistor will be dissipating 156.25 kilowatts, which would vaporize most resistors instantly!!!!!
Why high voltage does not kill?
Its not voltage that kills it is current.
High voltage CAN kill, if it can also provide high current (especially if the current comes near the heart as it takes under 1mA to stop the heart which isn't much current).
However if the high voltage source is current limited and/or the current only passes through the extremities it is very unlikely to kill.
What kind of flip flop has no invalid or unused state?
None, all flip flops have a small probability of entering a metastable invalid state.
A Z-transform is a mathematical transform which converts a discrete time-domain signal into a complex frequency-domain representation.
Which component requires a constant electrical charge and a periodic refresh of the circuits?
While your question is unclear and shows that you are somewhat confused, I believe you are probably asking about Dynamic Random Access Memory (DRAM) devices. These devices store data as electrical charge in billions or trillions of microscopic capacitors. Because no insulator is perfect the charge in these capacitors slowly leaks off, meaning to avoid losing the date the memory must be refreshed by periodically reading every capacitor and writing it back.
I have no idea what you were thinking when you wrote "requires a constant electrical charge" as the charge on the capacitors when they need to be refreshed may be half or less of the charge on the capacitors when they were first written or after they have been refreshed. The charge on the capacitors is never constant, which is the reason they need refreshing in the first place.
The first Dynamic Memory was built in 1941 by John Vincent Atanasoff and Clifford Berry, it used capacitors but was not randomly accessible. It had a storage capacity of sixty 50 bit signed binary words and was refreshed once per second.
Later Dynamic Memories included delay line memories (both mechanical and electrical) and CRT DRAM that stored the charge as tiny spots on the inside face of the vacuum tube.
Why leakage flux in transformer equivalent circuit is modeled as an inductor?
Because some of the primary flux fails to link with its own winding, the back- e.m.f. induced into the primary winding will be slightly lower than it would be had there been no leakage at all. We can account for this 'loss' of induced voltage as though it were caused by a small voltage drop occurring in the primary circuit, due to a small inductive-reactance connected in series with the primary winding. We call this the 'primary leakage reactance' (Xp).
A similar explanation can be applied to the secondary circuit, thus giving the secondary circuit a 'secondary leakage reactance' (Xs).
What determines the strength of the magnetic field when current flows through a conductor?
Magnetic fields currently flows through a conductor is determined by multiplying the number of turns of wire by the current flow. This is what causes electricity.
How do you identify leads in a diode?
There is more to diodes than in my answer, so I advise a search on youtube for videos on diodes, so gaining greater depth and clarity on diodes than I have been able to put here.
Why shift register are considered basic memory devices?
Shift registers contain multiple "flip flops" that can be set to represent a bit value (0 or 1). These values can be retrieved later and so the registers can function as memory.
Without knowing permissible current draw by the divider or its maximum power dissipation the actual resistor values cannot be determined, but the ratios of the resistor values can be determined from the required voltage drops.
The divider will be composed of 4 resistors starting at the 10VDC rail:
- 2VDC drop, ratio = 2V/10V = 0.2
- 3VDC drop, ratio = 3V/10V = 0.3
- 3VDC drop, ratio = 3V/10V = 0.3
- 2VDC drop, ratio = 2V/10V = 0.2
Therefore you will need 2 resistors (R1 & R4) that are 0.2 * the total resistance of the voltage divider and 2 resistors (R2 & R3) that are 0.3 * the total resistance of the voltage divider.
But as stated at the beginning you can get no further without additional requirements being specified.
Parameters are saved settings for selection criteria for what?
Print Settings, Report Settings, and Screen Settings
What is the advantage and disadvantage of single -supply operational amplifiers?
This is a fairly in-depth question, as there are a a lot of technical reasons one might prefer singe-supply over dual-supply, but a general, fairly universal reason is that very often available supply voltages don't go below ground (zero). There are some intrinsic properties in dual-supply op amps that may improve your circuit, but honestly you'd have to compare specs (data sheets) side by side to really see whether they make a difference.
A couple of items to note: you can use a dual-supply op amp as a single supply. You simple connect the low-side to ground instead of a negative voltage. Some op amps, however, are internally configured to not be able to accept a low-side supply voltage that goes much below zero. Connecting a negative voltage to the low side can actually damage or destroy the op amp IC. That is a strong disadvantage of a single-supply op amp. Another disadvantage, in terms of circuit configurations, is that a single supply op amp is really only meant for DC input, non-inverting configurations. This means that, without some fancy circuitry, you won't be able to amplify a zero-crossing signal like a sine wave or other waveform that goes below zero.
One thing single-supply op amps do well is to act like an open-loop comparator or closed loop buffer. They can be fairly inexpensive (if that's really an issue, where you'd be comparing pennies) and can have reduced pin counts on their packages (though IC packages are usually of some standard form).
What devices are used for diode?
Your question is not completely clear, but I'm going to guess what you might want. Here is a list of various types of devices that are/were used as diodes:
- galena (lead sulfide) cat's whisker detector
- vacuum tube diode
- gas filled diode
- copper oxide rectifier
- selenium rectifier
- cavity magnetron (specially constructed vacuum tube diode that acts as a microwave oscillator)
- germanium point contact diode
- germanium junction diode
- silicon junction diode
- varactor diode (voltage controlled variable capacitor)
- zener diode (reverse breakdown regulator)
- avalanche diode (surge protector, etc.)
- IMPATT diode (microwave negative resistance amplifier)
- metal-semiconductor junction (schottky) diode
- shockley diode (threshold trigger)
- photodiode (light sensor)
- tunnel diode (negative resistance amplifier)
- various types of light emitting diodes
- various types of LASER diodes
- silicon solar cells
- gallium arsenide solar cells
- etc.
There are also a wide variety of two terminal devicesthat can be referred to as diodes, but can conduct in either direction:
- neon lamps
- neon lights/signs
- cold cathode fluorescent lamps
- mercury vapor street lights
- high & low pressure sodium vapor street lights
- geiger-mueller tube
- xenon HID vehicle headlight bulbs
- gunn diode (microwave negative resistance amplifier)
- PIN diode
- etc.
