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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
How much current will flow through a 2.4 kilohm resistor when 7.2 kilovolts is applied?
Divide the voltage by the resistance in order to obtain your answer.
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 would happen if you didn't have a light bulb for a circuit?
it would be ok in a circuit which didn't need a light bulb.
Why are transistors used in circuits?
The two main functions of a transistor are: (a) signal amplification, and (b) solid-state switching.
Can we replace a thyristor by a mosfet?
No because a mosfet does not work the same as a thyristor. In a thyristor the current flows even when the gate pulse is removed, until the current stops. That is not the case for a FET.
What is the typical rating of a hot wire relay contacts?
The typical rating of a hot wire relay contacts is 35 amp
What does a 60-Hz aternating current do?
Everything, in a country like the USA where the normal supply works on 60 Hz.
Can you test the output amps of a DC generator with no load?
Any voltage source, whether a generator or a battery, will NOT supply an output current unless it is connected to a load. So the only way to test the output current is by connecting it to a load.
What would make the plate of a vacuum tube glow bright red?
That bright red color is heat: infrared energy and visible light. The electrons gain kinetic energy as they accelerate away from the Cathode. As each electron is absorbed into the metal Plate, its kinetic energy becomes acoustic motion in the Plate's atoms - heat. (The plate is being hammered.)
It is not normal for vacuum tube circuits to operate at high Plate temperatures that are this conspicuous. This circuit has an excessive product of Plate voltage times Plate current, and/or the vacuum tube Grids are biased incorrectly.
One common technique for reducing this heating effect is to use a second Grid near the Plate that is biased much more positive than the Plate. This causes the electrons to decelerate between Grid 2 and the Plate - loosing most of their kinetic energy before absorbtion.
What is the relationship of current through the resistor and inductor in the LR parallel circuit?
When they are in parallel the same voltage appear across both. The resistor carries a current of V/R, the inductor carries a current of V/(jwL). So the current in the inductor is 90 degrees behind in its phase.
What is the time base of an oscilloscope?
This is the internal circuit that causes the horizontal movement of the electron beam across the screen of the oscilloscope. It can be adjusted to vary the time taken for the beam to move across the screen.
Which of the coil of the wattmeter has high resistance?
The voltage (or 'potential') coil has the higher resistance, because it is connected in parallel with the load.
Why are subjective accounts often biased?
Because subjective accounts are opinionated and emotional, The narrator usually provides only one side of the story.
When both junctions of NPN diode are reverse biased then the diode is in which mode?
Transistor will be in OFF mode.
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!!!!!
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.
