Electronics Engineering

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

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.

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.

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.

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

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.

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.

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.

It is simplest form of switching which have dedicated physical path between sending and receiving. In circuit switching network,a set of switches are connected by physical link. A connection between the two stations is a dedicated path made up of one or more links.

AC is supplied to the input of DC power supply. One way to get to DC is to full wave rectify the AC sine wave. Basically you flip the negative side of the AC waveform to the positive side. You are left will all positive voltages varying from the peak voltage to zero and then back to peak. To make DC you need to smooth out the valleys and make them as close to the peak voltage as possible. You do this with various types of filters that usually involve a large capacitor. Once filtered you can use various circuits to either create a fixed DC output voltage or a variable output.

Electrons cannot traverse or move thru an open circuit. Therefore there is no current or 'electron' flow. Voltage may be present with an open circuit but it is doing no 'work'.

Compare an open circuit with 'potential' energy. Even though potential energy exist there is no kinetic energy unless the electrons have a path to take.

An open circuit provides no such path.

Kinetic energy means something with mass is moving and in some cases that movement is harnessed to accomplish 'work'.

Potential (voltage) which is doing nothing because a circuit is open cannot accomplish any work since there are no electrons moving.

Another perspective:

If an electric circuit is opened, the electricity flow stops. This is due to the fact that air is a strong insulator, and most amounts of electricity (save for lightning) do not have enough voltage to overcome this resistance (in a process called ionization). This is reflected in a formula V = I × R where r is resistance, i is amperage, and v is voltage. Through this relationship, as resistance reaches a high level, voltage drops, and the electric flow stops because it cannot overcome the resistance with the force of voltage or amps.

A thought on the ionization process:

As ionization occurs, resistance across the 'gap path' drops and voltage, if not regulated will drop as well. When there is not enough voltage to cause ionization the voltage will be higher than at the time ionization occurs.

At ionization, current (I) will increase, resistance (R) will decrease and voltage (E) will decrease as well and the potential (voltage) is now causing energy or electrons to flow.

As the ionization occurs much less voltage or potential is required to maintain the ionization path than is required to achieve ionization to start with.

Example: A cars ignition coil is capable of producing 45K~50K volts of electricity.

Yet when the voltage is measure at the end of the spark plug wire there will be only 9K or 10K volts due to the air/fuel molecules being ionized

Not to sure ionization actually is applicable to the original question however. :0)

BTW, I'm 'old school' where E=I x R where E = Voltage.

Just like megacycles to megahertz, I guess everything changes but the laws of physics.

Transistor=Transfer+Resistor.

When Transistor operates in active region its input resistance is high and output resistance is low.

So,We can consider transistor as a device which transfers its resistance from high to low.

And by this property transistor amplifies input signal.

It is used to detect very small DC currents only. For AC signals Detectors are used.

The calculations for changing the firing angle in SCR is K = 1 [π − α + 1 sin(2α )]

When a diode passes from forward biased to reverse biased it takes a short period of time for the charge carriers in the vicinity of the junction to recombine and create a nonconducting depletion region. During this time period the diode conducts in the reverse direction, this is called the reverse recovery time.

Its different for every kind of diode, to get the value for a specific diode consult the datasheet.

A passive element is an element of the electrical circuit that does not create power, like a capacitor, an inductance, a resistor or a memristor.

The higher the resistance the dimmer the light will become. The voltage drop (current) is proportional to the resistance as seen in the equation V=IR, since voltage remains the same throughout a series circuit if the equivalent resistance goes up the amount of current reaching the lightbulb must go down to equal the voltage thus creating a dimmer lightbulb.

The formula you are looking for is R = E/I

An open circuit essentially has an infinite resistance. It is shown on digital multimeter as OL. (Open Line) A short circuit should read zero, or nearly zero, depending on the accuracy of the meter.

Watt ( VA or W ) is the unit of power calculated by multiplying the voltage and the Current in Amps. There is no watt in 220 V. But if there is an appliance working with 220V then first find the current it uses and then calculate the wattage the appliance uses.

A trimmer resistor usually called a trim pot is a small variable resistor it is used in circuits to do preset it is trimmed with a trimmer screwdriver it is made up with a round fiber disc with a layer of carbon with a wiper that run on the carbon layer to change the resistance it always have 3 connecting pins where the center one is connected to the wiper and the other two to opposite ends of the carbon strip.