Electronics Engineering

A generator produces electricity.

A battery holds an electrical charge.

Of course, when we convert dc to ac, we need to feed an electronic circuit using transformers that have a range efficiency between 80 to 90, depends on the iron composition of the frame.

A type of superheterodyne radio using two separate mixers, each producing its own intermediate frequency.

The block diagram of such a receiver is like this:

RF -> M1 -> IF1 -> M2 -> IF2 -> D -> AF

angle modulation is called non linear modulation because the information is stored in phase of the carrier signal

: hi.. : i have a little idea about this question.. : because of low power consumption and accurate measurements we can use static relays based on microprocessor in power system networks. also filtering of noise is possible with static relays(based on microprocessor). : also for continious monitoring and security we can use these microprocessors.

computers and printers xc

Advantages of an Algorithm:

Effective Communication: Since the algorithm is written in English like language, it is simple to understand the step-by-step solutions of the problems.

Easy Debugging: Well-designed algorithm makes debugging easy so that we can identify a logical error in the program.

Easy and Efficient Coding: An algorithm acts as a blueprint of a program and helps during program development.

Independent of Programming Language: An algorithm is independent of programming languages and can be easily coded using any high-level language.

Disadvantages of an Algorithm:

Developing algorithms for complex problems would be time-consuming and difficult to understand.

Understanding complex logic through algorithms can be very difficult.

a typical example of a d.c current device is a generator it supplies current directly to houses

It will conduct electricity when the voltage across its terminals reaches a certain value. Once the over voltage is extinguished, the protection diode becomes an open circuit again.

Therefore, you need to connect a protection diode between both wires to be protected (differential mode) and from each wire to ground (common mode).

Protection diodes are primary protection devices (fast reacting), but they cannot handle too much current. That is why they need to be used with secondary protection devices (fuses and gas arrestors) to provide better protection.

A vacuum diode is an electron valve that supports current flow through it in only one direction. It is composed of two electrical "parts" or elements and the evacuated glass envelope. Additionally, there is usually a heater, a coil of special alloy wire that can be driven to red heat by a modest application of voltage. (A vacuum diode without a heater would be a cold cathode diode.) The heater is coiled inside a cylindrical element called the cathode. The cathode is composed of a special alloy, or, more properly is coated with an alloy, that has high thermal emission characteristics. That means that if it's heated sufficiently, electrons actually leave the metallic crystal structure of the metal (boil off) and hang around outside in the space nearby forming what is called a space charge. When we built the tube, we pumped all the air out, sealed the glass, and then fired a "getter" inside the tube to chemically bind the remaining bit of gas that was there. The tube really is highly evacuated. That's important because we don't want all those light weight electrons bumping into gas atoms and molecules when they are hanging around in the space charge, and especially when transiting the gap between the cathode and the other element inside, the anode or plate. If a voltage is applied across the cathode and plate, and the plate is negative, no current will flow in the tube. Electrons flow from negative to positive, but, darn it, they can't leave the plate to go to the cathode. That's called reverse biased. It's hooked up "backwards" like that. But if the cathode is connected to negative and the positive connected to the plate, electrons that were in the space charge will be driven away from the cathode and attracted to the plate. Current willflow in this direction. That's forward bias. There isn't a lot of internal resistance when the diode is forward biased, either. It conducts really well. The vacuum diode can be used to rectify an AC voltage and turn it into DC. In that application, it permits current flow during half the AC cycle (when it's forward biased), and does not allow it in the other (reverse biased) half. There aren't a lot of vacuum tubes around like back in the day. Modern electronics has seen innovations that have driven the vacuum diode away. Hey, wait a minute! They're still here! They sneaked back! But they're here in disguise!! I'll betcha that you've got one in your house! Yeah! You got a microwave oven at home? The heart of a microwave oven is a (specialized) vacuum diode that sits inside a magnetic field. It's called a magnetron, and it's the microwave generating device inside the appliance. Betcha didn't know that. The way the magnetron works is..., hey, wait. That's another question.

The NiCad or nickel cadmiun battery develops a "memory" of its duty cycle (called - surprise! - "memory effect") if it is used in a "pattern" for a while. If, say, a 2-way radio is used only a few minutes a day over a number of days and then put back on a charger after each use, it will "remember" this. If an attempt is made to use the radio for more time, the batteries just "drop dead" and the radio is unusable.

Though we know a great deal about electromagnetic (em) waves, there are still more things to learn. Our grasp of a solid body of knowledge of em waves is showcased by our use of electricity, and, in particular, our use of electronic gadgets and equipment. We're down with a lot of stuff, and we got tools and toys to prove it. But we still have things to learn. There remain some fundamental questions regarding some of the more subtle aspects of the working of electromagnetic waves. Here's a simple example: superconductivity. It was first discovered by Heike Kamerlingh Onnes in 1911. That's almost a hundred years ago! And do we know how superconductivity works? Nope. We're still scratching our heads. Einstein published E=mc2 in the early 1900's and we had the bomb about 50 years later. And with a simple little phenomenon like superconductivity, we still don't know how it works almost a century later. There's still work to do as regards our investigation into how electromagnetic waves work. Wouldn't you agree?

The 8051 runs on +5vdc.

A loop statement is used to iterate through a set of sequential statements. The syntax of a loop statement is

[ loop-label : ] iteration-scheme loop

sequential-statements

end loop [ loop-label ] ;

There are three types of iteration schemes. The first is the for iteration scheme that has the form

for identifier in range

An example of this iteration scheme is

FACTORIAL := 1;

for NUMBER in 2 to N loop

FACTORIAL := FACTORIAL * NUMBER;

end loop;

The body of the for loop is executed (N-1) times, with the loop identifier, NUMBER, being incremented by I at the

end of each iteration. The object NUMBER is implicitly declared within the for loop to belong to the integer type

whose values are in the range 2 to N. No explicit declaration for the loop identifier is, therefore, necessary. The

loop identifier, also, cannot be assigned any value inside the for loop. If another variable with the same name exists

outside the for loop, these two variables are treated separately and the variable used inside the for loop refers to the

34loop identifier.

The range in a for loop can also be a range of an enumeration type such as

type HEXA is ('0', '1', '2', '3', '4', ' 5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'):

. . .

for NUM in HEXA'('9') downto HEXA'('0') loop

-- NUM will take values in type HEXA from '9' through '0'.

. . .

end loop;

for CHAR in HEXA loop

-- CHAR will take all values in type HEXA from '0' through 'F'.

. . .

end loop;

Notice that it is necessary to qualify the values being used for NUM [e.g., HEXA'('9')] since the literals '0' through

'9' are overloaded, once being defined in type HEXA and the second time being defined in the predefined type

CHARACTER

Communication is at speed of sound. Signal attenuation. Noise of signal travelling through air.

A: the capacitance will increase. in series it will decrease accordingly

CPARALLEL = Summation1-N (CN)

CSERIES = 1 / Summation1-N (1 / CN)

The car's alternator is a three phase generating system. Inside the alternator is a three phase full wave diode bridge that changes the AC generated voltage to a DC voltage.

Important considerations when choosing power supplies are type of output, regulated or unregulated. Regulated means the Voltage will stay constant (at least while the supply is operating within its specification) irrespective of the load. Unregulated supplies tend to have higher outputs than stated and are normally used with equipment that has it's own internal regulation circuitry. If in doubt always choose a regulated supply. Using Voltages higher than recommended for a particular piece of equipment may cause permanent damage. Where Wattage or VA rating is quoted this often refers to the total wattage available for a power supply. This figure is mostly used for multi rail units, so that when the VA is calculated for each output and then added together, the total Wattage / VA should not exceed the makers rating.

E = Eo/k k is dielectric constant

A number of years ago, in the early days of consumer HD television there was an analog high definition component signal format available. Since then, manufacturers and content publishers have agreed that HDMI is the only HD interface to be available on equipment. Although the signal interface also carries audio and other data on a single cable, it does not benefit the consumer.

It is unlikely that any other analog interface will become available for HD signals.

There are a number of adapters that can accept HDMI signals and deliver an analog signal, normally in the form of a VGA signal. Some work better than others but many can be adversely affected by HDCP (High bandwidth Digital Content Protection) which can prevent the signals being converted to their analog form.