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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

The voltage measured directly across an open switch in a circuit will be?

The voltage measured across an open in a series circuit is the equivalent of the sourse voltage.

What is the relation between peak current and effective current of an AC power system generated by commercial power companies in the US?

The effective current is the square-root of the average value of the current-squared, root-mean-square or rms for short. That is because the power in a resistive load like a water heater is proportional to the square of the current.

The rms voltage of an ac supply gives the same heating effect as a dc supply of the same voltage.

The peak current is sqrt(2) times higher.

The rms voltage and current are always quoted when referring to an ac power supply.

Why do you use 120 or 240 volts and not 480 volts if we operate equipment at higher voltages?

You're looking for what some folks call a voltage converter, international voltage converter or international voltage adapter (and there are more names). For smaller equipment, an "adapter" like folks get in those little travel kits will probably do the trick. Electrical outlets in Europe are different from the U.S. outlets (both in voltage as well as in the shape of the plug), and the kit contains the stuff to make your little shaver or your laptop work over there. For larger equipment, a step-down transformer is required. These come in various sizes, and they are usually not super cheap. The unit is made of copper wire and a ferromagnetic (iron) core, and it will be fairly heavy, bulky and even a bit inconvenient. Ask a local electronics outlet representative to help you sort it out. They have the stuff for sale and are in "sales mode" when they're working, but they can be helpful by supplying information (even if they don't make a sale), and that is part of their job, too. Certainly there are a number of online resources that vend the products that can help.

What is the effect of resistance of the flow of current?

Thet resistor opposes the flow of current through it becoz of its internal construction. Its material has opposing property.

How to calculate the peak-to-peak value of a signal?

A: AC or our line voltage is sinusoidal in nature it goes up to a positive peak returns to zero and proceed to the negative peak. 120V AC is actually swinging from peak to peak. It is 120 volts but the peak is the 120 v times 1.41 or 169.2 volts and since it also go negative then the peak to peak 120 volts times 2.82 or 338.40 volts or twice the peak voltage

How much rating of voltage and current is required for a house?

That is a wrong question, because the house has to take the voltage, the power station is delivering.

Either 120 volts in the USA or 230 volts in Europe.

Volts are never consumed.

What is the mean by at89c51?

it is a microcontoller ( a version of 8051)

At denotes ATMEL company

C stands for CMOS

9 stands for flash memory

Is current the same at all points in a circuit?

By Kirchoff's current law, the sum of the signed currents entering a node is zero.

In a parallel circuit, this means the sum of the (often single) current(s) entering a node (junction) is the same as the sum of the (two or more) currents leaving that node.

To determine the current in a particular branch, you need the voltage and resistance, or you need something else that you can use to calculate the current.

In the second case, if you know the total current and one branch current in a two branch circuit, you know the other branch by calculating total minus first branch.

For the first case, one method is to take advantage of Kirchoff's voltage law, which states that the signed sums of the voltage drops around a series circuit is zero. In a parallel circuit, this means that the voltage drop across each branch is the same. If you then also know resistance, you know current.

What is 15A in ohms?

Ur talking about the movie rating, right? It stands for 15 accompaunt (sorry for spelling) if your under 15, you must be with an adult. Sorry if your talking about something else.

How many transistors did the Intel 286 microprocessor have in 1982?

Different versions of the Pentium 4 had different numbers of transistors:

  • 42M 180nm
  • 55M 130nm
  • 169M 130nm (P4EE)
  • 125M 90nm
  • 188M 65nm

Does a wire in an electrical cord of an electrical kettle have a higher or lower resistance than the heating element inside the kettle?

The heating element in the electric kettle will be primarily pure resistive. Power in that case is calculated

P = E*I = 250V*I = 3000 W

So the current is

I = 3000 W/250 V = 12 Amps

If there is anything else (lights, radio, PC, etc.) on the circuit that may be taking some current you are very likely to go over 13 A frequently. I don't know how accurate you can expect a fuse's blow point to be. Perhaps +/- 10%? Doesn't seem very trouble free.

Even if the circuit is dedicated to the kettle, consider this idea. We don't know exactly what conditions the manufacturer was considering when specifying the wattage. Probably operating conditions, when the element was hot. Then Ohm's Law tells us that the resistance R is

R = E/I = 250 V/12 Amps = 20.8 Ohms

But the element's resistance would be lower at first when it is cold.

My calculations indicate that if the element is made of nichrome wire, and if the temperature change is 200 degrees C, the hot resistance of 21 Ohms is probably about 1.7 Ohms higher than when at room temperature. If that is true, when you first turn it on, Ohm's Law says that the initial current should be 12.95 Amps.

Regardless of this analysis, remember that the fuse requirement is based on the size of the wires in the wall. You don't want those wires to get hot. Don't put in a bigger fuse than what was there originally.

Write a program to compute factorial of a number on 8051?

FOR NO'S TILL 8 ONLY Example for Number 4

4!=4*3*2*1 which is = 24

MOV R1,#04

MOV R0,#04

MOV A,R0

CALL:DEC R0

MOV F0,R0

MUL AB

DJNZ R1,CALL

LCALL 0003

SHARAD KOTHARKAR

What circuit is a circuit in which electrical current has more than one path to follow?

A circuit that has more than one path for the current to flow is a parallel circuit. The circuit must have two or more paths to be considered parallel.

A circuit that has only one current path through multiple components is a series circuit.

What is the negatively charged electrode of a cathode ray tube?

The negatively charged electrode of a cathode ray tube (CRT) is the cathode. The tube is a cathode ray tube, and electrons stream off the cathode, are accelerated across the evacuated space and "directed" either electromagnetically or electrostatically, and then strike the phosphor coating on the positively charged anode at a "location" determined by the "directing" elements.

How do you identify carbon resistor using colour code?

To identify the value of a carbon resistor using colour code use the following table...

0 - Black
1 - Brown
2 - Red
3 - Orange
4 - Yellow
5 - Green
6 - Blue
7 - Violet
8 - Grey
9 - White

... and look at the bands. The first two bands will be the digits, and the third band will be the multiplier. For instance, Brown - Red - Orange will be 12000 ohms, where the 1 is the first band, the 2 is the second band, and the three 0's is the third band.

If the third band is Gold or Silver, then the multiplier is 0.1 or 0.01 respectively. For instance, Brown - Red - Gold would be 1.2 ohms, and Brown - Red- Silver would be 0.12 ohms.

If there is no fourth band, the resistor is +/- 20%. If the fourth band is Silver, the resistor is +/- 10% and, for Gold, +/- 5%.

Some high end resistors have more bands. The 1% resistor will have a third digit band, and some resistors will have a band indicating temperature coefficient.

Why microwave frequency are used in satellite communication?

Microwave is a "line of sight" system, so the two points must be able to "see" each other. If they're linked by satilite, that can be around the world, and if by microwave towers then as far as you can see the tower.

What is potential barrier factor?

Potential barrier is the energy inserted in order to go against the passage of electron.

What is the definition of project environment?

Project environment represents a connection, where the project is processed. It impacts the project , therefore, conditioned. Interaction is provided by numerous factors as operational, physical, ecological, social, cultural, economic, psychological, financial, organizational etc.

Why is a thermistor a non ohmic conductor?

Ohm's law states that the current and potential difference (voltage) are directly proportional, provided the temperature is constant. The resistance of a thermistor is dependant on the temperature, so it does not obey Ohm's law. Components that do not obey Ohm's law are non-ohmic conductors.

What does resistance in wire depend on?

Resistance is directly proportional to the resistivity and length of the conductor, and inversely-proportional to its cross-sectional area. As resistivity is affected by temperature, we can say that temperature indirectly affects resistance.