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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
Design a mod-7 synchronous counter using JK Flip-Flops?
You do it by studying, and doing your homework by yourself instead of trying to get someone else to do it for you.
Is current equals voltage divided by resistance series circuits parallel circuits or both?
Ohm's law: Current equals voltage divided by resistance.
It does not matter if the circuit is series or parallel or both. Ohm's law still applies. What you do need to consider is that it applies for each component on its own merits. The is one of the fundamentals of circuit analysis, the progressive analysis of each component, taking account of what you know for that component, until you know everything about all components.
How many 125 watt bulbs can be used on a 15amp circuit?
Assuming that your voltage is 120 volts the maximum wattage on that circuit is W = A x V = 15 x 120 = 1800 watts. Code only allows circuits to be loaded up to 80% capacity. 1800 x .8 = 1440. 1440/25 = 57 lamps.
Assuming that your voltage is 240 volts the maximum wattage on that circuit is W = A x V = 15 x 240 = 3600 watts. If the question is from a 240 volt country you will have to find out what the local electrical regulations are for circuit loading.
What should the beat frequency of two in-tune instruments be?
The beat frequency of two in-tune musical instruments is zero.
How do touch screen phones work?
To allow people to use touch commands that require multiple fingers, the iPhone uses a new arrangement of existing technology. Its touch-sensitive screen includes a layer ofcapacitive material, just like many other touch-screens. However, the iPhone's capacitors are arranged according to a coordinate system. Its circuitry can sense changes at each point along the grid. In other words, every point on the grid generates its own signal when touched and relays that signal to the iPhone's processor. This allows the phone to determine the location and movement of simultaneous touches in multiple locations. Because of its reliance on this capacitive material, the iPhone works only if you touch it with your fingertip -- it won't work if you use a stylus or wear non-conductive gloves.
The iPhone's screen detects touch through one of two methods: Mutual capacitance or self capacitance. In mutual capacitance, the capacitive circuitry requires two distinct layers of material. One houses driving lines, which carry current, and other houses sensing lines, which detect the current at nodes. Self capacitance uses one layer of individual electrodes connected with capacitance-sensing circuitry.A mutual capacitance touch-screen contains a grid of sensing lines and driving lines to determine where the user is touching.
A self capacitance screen contains sensing circuits
and electrodes to determine where a user is touching.
Both of these possible setups send touch data as electrical impulses. In the next section, we'll take a look at exactly what happens.
The iPhone's processor and software are central to correctly interpreting input from the touch-screen. The capacitive material sends raw touch-location data to the iPhone's processor. The processor uses software located in the iPhone's memory to interpret the raw data as commands and gestures. Here's what happens:
- Signals travel from the touch screen to the processor as electrical impulses.
- The processor uses software to analyze the data and determine the features of each touch. This includes size, shape and location of the affected area on the screen. If necessary, the processor arranges touches with similar features into groups. If you move your finger, the processor calculates the difference between the starting point and ending point of your touch.
- The processor uses its gesture-interpretation software to determine which gesture you made. It combines your physical movement with information about which application you were using and what the application was doing when you touched the screen.
- The processor relays your instructions to the program in use. If necessary, it also sends commands to the iPhone's screen and other hardware. If the raw data doesn't match any applicable gestures or commands, the iPhone disregards it as an extraneous touch.
All these steps happen in an instant -- you see changes in the screen based on your input almost instantly. This process allows you to access and use all of the iPhone's applications with your fingers.
The shape of the screen changes when you need it to as well -- you can shift the perspective from vertical to horizontal by tilting the phone. An accelerometer inside the iPhone lets the operating system know to change the orientation of the image on the screen. This means that you can scroll through long lists of music files on a long, narrow screen, and you can watch movies in a widescreen format. You can learn more about accelerometers in How the Nike + iPod Works and How the Wii Works.
What color is hotwire in a typical 12 volt circuit?
Normally it is Red but not 100% of the time. Always check with a multimeter.
Why do electrical appliance work on ac current an not in dc?
Mainly because your home is supplied with a.c. not d.c. Even those appliances (audio systems, etc.) that require d.c. supplies can be connected to an a.c. supply, because they have internal transformers/rectifiers which change the a.c. voltage to the required d.c. voltage.
What does current divided by resistance equal?
Only those with a weak understanding of electricity believe that the equation, I = E/R, is derived from Ohm's Law. In fact the equation is derived from the definition of the ohm, and not from Ohm's Law! Those who believe that this equation comes from Ohm's Law are demonstrating a fundamental misunderstanding of that so-called 'law'.
Ohm's Law essentially states that 'the ratio of voltage to current is constant for variations in voltage'. No mention of the ohm, and no mention of an equation! If you were to plot a graph of current against voltage for different values of voltage, you will find that very few conductors or other electrical devices produce a straight-line graph; the overwhelming majority produce a curve. So 'linear' or 'ohmic' conductors obey Ohm's Law, whereas 'non-linear' or 'non-ohmic' conductors and devices do NOT! An incandescent lamp, for example, does NOT obey Ohm's Law because its resistance constantly changes as the voltage applied across it changes.
However, the equation R = V/I, which is derived from the definition of the ohm, applies to any circuit for any specified value of voltage, whether that circuit obeys Ohm's Law or not.
If voltage constant when the current increases what does the resistance do?
In an electric circuit, ratio of current and voltage is constant which is known as the resistance of the circuit. If voltage or current is to be changed the resistance has to be changed. You cannot keep an invariable resistance in the circuit and increase current while keeping voltage as constant.Hence to vary the voltage or current in a circuit different equipments like rheostat,potentiometer are used.
How should a ammeter and voltmeter be connected in series?
no. you want to measure across the desired circuit segment. whether you are measuring voltage drop or current.
A unipolar waveform is a type of electrical signal where the voltage fluctuates between a zero reference point and a positive or negative peak, but does not oscillate around zero. This means that the waveform only exists above or below the zero line, typically remaining positive or negative throughout its cycle. Unipolar waveforms are commonly used in digital circuits and signal processing, where a clear distinction between two states is needed, such as in pulse-width modulation. Examples include certain types of pulse signals and power supply outputs.
What is maximum forward current in case of diodes?
the maximum amount of current that a forward-biased diode can withstand before burning out or being seriously degraded.
What is meant by atenuation in fiber optics?
Attenuation in fiber means 'loss of optical power' suffered by the optical signal in fiber itself.
What happens to the current through a component as the voltage increases?
In any conductor, increased current flow will result in voltage drop. This won't have any effect until you reach about 5% of the circuit voltage, at which point your efficiency declines. If the increased current trips the breaker, then your Voltage will be 0
For reference: Vd= (1.732 x K x I x L) / cmil
Vd is Voltage drop in Volts
1.732 is sq rt of 3 for three phase circuits. For two phase or single phase circuits use 2
K is resistance in Ohms of 1cmil, 1ft of conductor.
K=12.9 for copper conductors, 21.2 for aluminum, both at 75 deg C
I is the current (hence, the more current, the more voltage drop)
L is the length of the conductor
cmil is the wire size, or more accurately, cross-sectional area of the conductor
What PIV rating must a diode have to be used in a rectifier with a peak output voltage of 50 V?
100, or twice to expected output. This is because, on the alternate half-cycle, the line goes to the alternate peak-peak voltage away from the charged capacitor. In this case, that will be 100.
However, in terms of actual rating, you must always provide a margin of safety. I would use a 200 volt diode in this application, to allow for variance in limits and transient response.
An ammeter is an instrument which is used for measurement of current flowing in any circuit
V = IR
Voltage = Current * Resistance
so
9 = 0.25 * R
Hence R =36 Ohms
What is the output voltage of a 400 watt mtal halide?
According to Sylvania, their 400w lamps reach a maximum surface temperature of around 750F. This seems to be universal of all HID lamp types.
How can you convert T flip flop into D flip flop?
D Flip flop which have driven the output as the given input there is no change in the I/O.
But in the case of T-Flipflop the output is inverted to the given input .i.e complement of the input is output.
Thank you i am meganathan...
When can voltage be induced but not current?
"Induced" is the verb you are looking for. A current is induced in the secondary circuit by the current in the first changing, provided both conductors are close enough for the driving current's electro-magnetic field to enclose the second conductor.
Note that word "changing". Direct current produces a field but that remains constant and does not induce a secondary current, as a.c. does.
Efficiency of class C amplifier is approximately 100%.
What are 3 advantages transistors have over valves?
Transistor-transistor logic (TTL) is a class of digital circuits built from bipolar junction transistors (BJT) and resistors. It is called transistor-transistor logic because both the logic gating function and the amplifying function are done by transistors.
To know about the advantages of TTL logic family, one should have a basic idea about RTL, DTL etc. Diode logic (DL) uses diodes to implement logical functions like AND and OR. But the disadvantage is that it can not perform NOT operation. As AND and OR are not complete functions by themselves, they can not perform several logic functions without NOT. Hence, there was a need for some device which can perform a NOT function as diodes can not. That device is a transistor. Then came the DTL which uses a transistor along with diodes. As a transistor can act as an inverter, NAND (NOT-AND) & NOR (NOT-OR) operations can be performed. But this logic uses several diodes which will slow down its operation. Due to the delay offered by them, the logic levels may sometimes change i. e. 0 t0 1 or 1 to 0. Then came TTL. This logic uses a multi emitter transistor, a transistor with many emitter terminals. As every emitter is nothing but a diode, this logic eliminates the use of all diodes. This is the major advantage. As transistor becomes ON and OFF much rapidly than a diode, switching time will be faster.
TTL, or Transistor-transistor logic replaced resistor-transistor logic, and used much less power. The TTL family is very fast and reliable, and newer faster, less power-consuming, etc. types are always being developed.
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