Electronics Engineering

You need to make a distinction between analog and digital signals, and analog and digital data. Digital data can be sent on an analog signal by using a modem. Digital data sent on a digital signal is done over a wire using voltage pulses at two or more levels. Digital signals can't travel very far without amplifiers, but analog signals can cover huge distances, such as with satellite communications and even communications with deep space probes.

Modern uses are to merely name different stars and to locate them in the sky.

bungaw..

wavelength=velocity x frequency

wavelength=3x108 x 90.7x103

wavelength=272.1x1011

sound reproduction

The electronics engineer can get job in those companies where electronics equipments plays vital role..for eg.Nepal Telecom,Ncell,airport,Electricity Authority etc. If you are tallent then you can open your own companies to produce devices such as mobile companies,inverter companies etc........

Current source means current generator for a circuit.

An ideal current source gives all current to the circuit, but practically a current source does n't give all current to the circuit, instead, a source resistor is connected in parallel to the current source to indicate the current drop.

Registers are a special type of memory that are dedicated to micro-controllers (or CPUs). Controllers have register-memory for speed.

The slowest part of any computer is the bus. The bus is the wiring that connects different components. In this case the micro-controller and main memory. While main memory and the micro-controller are both very fast, the wiring between them is slow.

Should the micro-controller have to be slow to compensate for the slow wiring?

The solution is to have register-memory. Memory physically part of the micro-controller that allows the controller to use it instantly. The controller can then move data from a register to RAM as soon as the bus is available.


Register-memory comes from the concept of a Cash Register [1879]. A cash register is used to perform transactions and store money on it's way to a vault the same way a CPU or micro-controller stores data on its way to main memory.

You can use a voltage transformer or converter that is specifically designed to step down the voltage from 240V AC to 220V AC. Make sure to select a transformer that is rated for the appropriate power handling capacity to ensure safe and efficient operation.

A circuit can have as little as two components

1 Must have a power source

2. Something for that power source to power, for example a light

*Assuming you already know you need wires to complete the circuit

there are several kind of different , we can separate :

1- Methods of analysis

2- properties of Methods of analysis

3-properties of their structure

4-resolution and resoiving power of their

(by : S.M Zendehbad)

240 watts at 120 volts requires 2 amperes.

Power = voltage * current

You can get one in a lot of places. Some places are Sears, Home Depot, Maybe Radio Shack, or some other hardware store. The best brand you can get is Fluke. It is pretty expensive but it is really accurate.

smps out voltage is 12volt..

A switch mode power supply can have an output voltage of any value. However, common values are 5, 12 and 24V.

Capacitors charge by transferring charge from one plate to the other. This is not the same as a battery, though it can seem so. They oppose a change in voltage because the two plates are close to each other, separated by the dielectric, and the transfer of charge requires current. Once charged, however, the current becomes zero. The differential equation describing a capacitor is dv/dt = i/c, or volts per second = current over capacitance.

No current flows when the the voltage is zero.

Elcoma

elcina

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The absolute value of -9 is

=|-9| = 9

Explanation :

Here's how you can picture absolute value: Think of a railroad track with a zero sitting in the middle of it. Every little notch to the left and right of the zero is another number. Negative numbers line up on the left; positive numbers run along the track to the right. So, the number -4.0 is 4 units away from zero. The number -45.3 is 45.3 units away from zero and the number 10 is 10 units away from zero. Therefore, the absolute value of any number is really a positive number (or zero). You identify an absolute value of a number by writing the number between two vertical bars: |number|.

Mainly there are three points,

1. If you give AC to the field coil, there is no need of rotating it, as AC itself produces alternating flux.Thus generator will give Transformer action which actually transfer the power not actually it generates or produce as per the basic law of mutual Induction.

2.In case if you rotate the field giving AC Supply by a prime mover , actually constant poles(as in physical magnet) will not be produced.For every cycle of rotation,there will be continuous change in the poles in respect to three windings of Armature.So as it results irregular waveforms of voltages,we cant tap the pure sinusoidal 3 phase supply from armature.Most probably it will get distorts & might be chances of burning of Stator(armature)coil in Alternator.

3.So to overcome come from all above disadvantages, DC excitation will be given so that constant field strength will be maintained as in case if we employ permanent magnets which produces constant flux

No corrosion is not a reaction of a metal with nitrogen in the air. Nitrogen in relatively innert and will not normally form chemical compounds. It is the Oxygen in the air that causes the corrosion.

here's a cogent discussion: http://answers.yahoo.com/question/index?qid=20090215214428AAltCZz

It measures the current.

Usually,there are many mains sockets in a flat to provide electricity for electrical appliances.Do you know how these mains sockets are connected to the electric cable that carries electricity to the flat?

The electric cable that carries electricity to a flat is connected to the consumer unit.In the consumer unit,the electric cable branches into a number of parallel circuits that deliver electricity to ceiling lamps,mains sockets,air conditioners(or other appliances with high working current),etc.The circuit that delivers electricity to main sockets exists in form of a ring and is therefore called a ring circuit.

The ring circuit provides two paths for electric current to flow from the consumer unit to the mmain sockets.Each path only carries half of the electric current.Therefore,the chance of overloading the circuit is reduced.Besides,if one of the paths is damaged,there's still another path for carrying electric current.