Electronics Engineering

conductivity and mobility both are directly propertional

LED (light emitting diode) is an electronic component that generates light from the electrons flowing in one direction through it, in an electron circuit, possibly as part of a circuit board. In a circuit the light emission can be a short as a nanosecond. One or more LED's can be used to make light with a minimum of electricity. Modern applications are wide spread including optical sensor activators, calculator displays and automotive tail lights. LED's have come down in price and can last for tens of thousands of hours so have become an economical replacement for other lights in some applications.

For wireless communication, undoubtedly Guglielmo Marconi, who invented the spark gap transmitter. Then for telegraphy, it has to be Samuel Morse. The telephone was invented by Alexander Graham Bell.

mutual inductance

L=-e*intigral of i dt.

Resistors and MOSFET/ transistors are two different animals, sory but

The gain of a common-emitter amplifier is collector resistor divided by emitter resistor, or hFe, whichever is less. Since hFe depends on temperature, designing the amplifier to be dependent on resistance ratio makes it more stable. As such, the emitter resistance serves to stabilize the amplifier.

Solder is a metal ,specially alloyed to be used to fix or weld together other pieces of metal.

How to use it would depend on the application and the exact metals being used

current gain

According to Ohms law, which states that Resistance (R) = Voltage (V) / Current (I)

6 Ohms

The Nyquist Therorem states that the lowest sampling rate has to be equil to or greather than 2 times the highest frequency. Therefore the sampling rate should be 400Hz or more.

Yes.

The magnetic field reverses direction.

A: If you know the total resistance and total voltage then you know total current flow for the circuit, this current will be same for every resistor in series however the voltage drop will change for each resistor . So measuring the voltage drop across the resistor in question and divide by the total current will give you the resistor value.

electronic circuits are those which deals with flow of electrons. in general electronic devices are categorized based on the flow of e as conductor, insulator and semiconductor. since resistor resists the flow of electrons (it deals or works with electrons), it is consider as an electronic device.

to prevent direct conduction from base while collectingminority base carriers from emitter that "overshoot" the thin base.

A PN junction is a semiconductor interface formed by joining p-type (positively doped) and n-type (negatively doped) materials. This junction creates an electric field that allows current to flow in one direction while blocking it in the opposite direction, functioning as a diode. The p-side is rich in holes (positive charge carriers), while the n-side contains electrons (negative charge carriers).

Here's a simple diagram representation of a PN junction:

 P-type      |      N-type
  +----+     |     +----+
  |    |     |     |    |
  |    |     |     |    |
  +----+     |     +----+

In the diagram, the '+' symbols represent holes in the p-type material, and the '-' symbols represent electrons in the n-type material.

As long as the solar cells powering the transceiver (transmitter/receiver), that device should work on the moon.

The term, gatekeeper, means a person that tends, or stands guard at a gate and controls who goes through the gate. A gatekeeper is usually found at huge property entrances with gates, either personal property or public buildings like museums.

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.