Electronics Engineering

Semiconductor in pure form (i.e. without doping) is called intrinsic or i-type semiconductor. The no of charge carrier in this case is determined by the materials itself only and not by the impurities. In an intrinsic semiconductor number of excited free electron is equal to the number of holes.

The movement of electron towards the high potential causes electric current to flow in a circuit.

yes, with additional circuitry. an opamp wired as a differentiator followed by an opamp wired as a comparator can provide short timing periods. an opamp wired as an integrator followed by an opamp wired as a comparator, plus some other circuits left as an exercise to the reader can provide long timing periods.

If the internal capacitors are separate, I mean that there are 4 terminals, a separate positive and negative for each internal cap then you can connect them in two ways. If you connect them in parallel (positive to positive and negative to negative) you just add the values together, so if each is 100UF they total 200Uf and the voltage you can apply is whatever is rated on the body. If you want to increase the voltage so you can apply higher voltage you connect them in series, one of the negatives connects to the others positive and the remaining inputs are connected to the circuit (and if each is equal in value) you divide by two so they would only be 50UF in capacitance but the total voltage you can apply is double the rated level on the body. If the caps are of different values it gets more complicated, you have to calculate the C total buy using the following formula: 1/C total = 1/C1 + 1/C2. Then the voltage dropped across each cap is proportional to the values you calculated above. Remember, the total voltage will be dropped across the caps proportionally so if the caps are rated at 50V for example and they are not equal values, you can't connect them up to 100V because the larger of the caps will have more than 50V across it because of the mis-matched value of each.

A DC to AC inverter takes a DC voltage input to a AC voltage output. So if you have a 12v battery and need to run a 120v AC tool or something. All you need to do is plug a inverter to your battery and plug your 120v tool the the inverter. Takes all there is too it.

good question - Understand a nerve ok - I like to use an old Oak Tree for example that has no dead leaves - Now the Tree has many branches like a nerve

Now we pluck this tree from the earth and hold it upside down - follow me - and we suspend it upon another old oak tree with no leaves on the earth. So The big Old Oak Tree above is upside down with it's many branches and the other oak tree is on the Ground - the Two trees almost touch but don't - cause of the wind and the atmosphere perhaps even the fog - Now you see the Dendrites and The Nervous System withing the Great Cerebral Commisure - the synapse will be the fog and the humidity on our little jest or journey in time depends on our chemical balance within our synapse that is the wind between the tree

As more light bulbs are added in a series circuit, the effective resistance of the circuit increases. That causes the current leaving the source to decrease.

The expression for the current (I) is simply the voltage (V) divided by the total impedance (Z).

In your example its (40+j25) V divided by (R + / - j) Ohms.

We aren't given the dc resistance of the inductor so assuming it is zero.

Resistance of resistor is 20 Ohms.

Reactance of inductor is 2 * Pi * Freq * Inductor value in Henries. gives

2*3.14*79.5*0.6 = 299.7 Ohms.

So total impedance Z is (20+j299.6) Ohms....say (20+j300) Ohms

Now Complex series current I = V/Z = (40+j25) V / (20+j300) Ohms

Rather than taking surds we simplify to polar form here.

V = (40+j25) = 47.17 Volts at phase angle 32 degrees

Z = (20+j300) = 300.7 Ohms at phase angle 86.2 degrees

So current is 47.17 V /300.7 Ohms and phase angle is (32 degrees - 86.2 degrees)

I = 0.157 Amps at angle -54.2 degrees

Changing this to rectangular form gives (0.092 -j0.127) Amps

Scaler. Its vector counterpart is the electric field.

Capacity to the equivalent of the battery is reduced - that is, you'll run out of charge quicker but the voltage delivered will still be the same.

I wouldn't t reccomend twice the voltage but dc motors can run at 150% rated voltage for up to a minute with no adverse effects. That being said it shouldn't be a regular practice and it will definately need to cool off under less load between bursts. Typical use of this application would be in an electric vehicle more like a bicycle or a go kart.

The second one should roughly last twice as long as the first one.

You can't really say how long as it depends what you are using the computer for, but whatever you are doing the second one will always last about twice as long.

Since a short circuit is, essentially, a zero impedance connection between nodes, the current in a short circuit is limited only by the ability of the source.

In the case of an ideal voltage source connected to an ideal short circuit, you would have infinite amperes.

Electricity and Electronics Engineer

in case of inductor or capacitor power factor is always zero.as power factor is cosine of phase angle between voltage and current. in case of inductor and capacitor phase angle between voltage and current is 90 so it become zero so if given power factor is zero then it can be inductor or capacitor.

shut up , if u ask that it is just weird : ( Kreep !

1

Depending upon the cell itself, it could be as simple as two dots on the back of the cell, which is the non-blue side. On other cells, it could be the white vertical lines on the front = negative and the dots on the back = positive.

No.

A: actually any active components will oscillate with positive feedback

A transistor can be used as an amplifier along with an LC tank circuit to form an oscillator; it is an active device (as LIBURNO states) which will amplify the feedback signal coming out of the LC tank circuit. The tank circuit has a natural resonant frequency, meaning the L and C together will try to generate a specific frequency; this is then fed back into the input of the transistor amplifier, and the output is fed to the LC tank circuit exacerbating this oscillation until it reaches its' maximum level.

An inverting amplifier can be used similarly; the output is fed to the input; this will cause the output to change as fast as the amplifier can. The frequency of this design is much harder to control, but potentially higher. Also, without the LC tank, the output voltage will remain lower.

V = I x R so current I = 1/2 amp. I bet the bulb is rated at 60 W because Watts = Current x Voltage.

Where V = voltage (volt)

I = current (ampere)

R = resistance (ohm)

Your question isn't easy to answer. A lamp has two 'resistances': a 'cold' resistance, and a 'hot' resistance. Before it is energised, it is cold, so its resistance is low; when it is energised, it becomes very hot, and its resistance increases significantly. So, the question is whether your '240 ohms' is the cold resistance or the hot resistance. If it is the cold resistance, then a current of 0.5 A will flow through it for a fraction of a second, then its resistance will increase significantly, and the current will fall to a very much smaller value.

An article for a magazine that is meant to tell people about how products are sold to different countries

Logic gates are in fact the building block of digital electronics; they are formed by the combination of transistors (either BJT or MOSFET) to realize some digital operations (like logical OR, AND, INVERT ). Every digital product, like computers, mobile, calculators even digital watches, contain logic gates. The use of logic gates in digital world can be understood better by the following example: the single bit full adder in digital electronics is a logic circuit which perform the logical addition of two single bit binary numbers (a,b,cin) a and b are the the two binary number of single digit (either 1 or 0) and cin is the carry input . say for example a,b,cin= 1,1,1 gave an logical sum output of 1 and a carry of 1 , a,b,cin= 110 gave sum= 0 and carry of 1. Now this adder can be formed by the combination of many gate like by using NAND gates only. or by using XOR , AND ,OR gates and so on. So, in a nutshell, the adder which is of great importance in your computer processor and also in many more applications is basically built from the logic gates.

Doppler radar is used to measure speed, not temperature.