Electronics Engineering

All materials do, with the possible exception of semiconductors

and junctions between them under certain circumstances.

Exactly...you answered your own question.

Each DC bulb will drop voltage according to its resistance and the amount of current it draws.

Peak values times 0.707 gives the RMS value.

This question cannot be answered without knowing the waveform of the voltage.

If it is continuous direct current rms value is 100V.

If it is a sine wave (like house current), the rms value is 100/ (sq. root(2)) or 70.7V approx.

For a regular series of square pulses, it is 100V times the mark/(mark+space) ratio.

Any other waveform, you need to calculate the root mean square value of the function. ( Square, integrate and take square root over one complete period.)

If all the above fail, measure the heating effect in a 40K resistor. It will be 0.25 Watt or less - calculate from the result.

If by RMS voltages you mean what is the RMS voltage of the power source voltage to the device proper it might be 120 volts AC like right out of the wall where you plug it in. That 120 VAC is an RMS voltage. That's the way we measure AC voltages like those wired into residential and commercial settings. Picture an AC sine wave. For a sine wave that is 120 volts RMS, its peak voltage will be right at about 170 volts. Volts RMS is the so-called DC equivalent voltage. The RMS voltage for a larger X-ray machine could be 220 VAC or 440 VAC, too, as higher power units are available. These units can be fixed or "permanent" in a medical setting or in an industrial plant, and can take advantage of higher electrical bus voltages. The X-ray tube itself runs on a DC voltage. A DC voltage doesn't usually have the idea of RMS associated with it. The voltage is "fixed" and not changing over time like it does in an AC source. Modern X-ray tubes can have operating voltages that range from 10 kV to 300 kV applied to accelerate the electrons before slamming them into an anode target.

7805 ic is a voltage regulator,up to 5 Volts can maintain

It is quite simple, you have to draw a truth table. Derive K-Maps from there and you would have the equations. I am assuming you do know how to solve simple combinational design problems

no,aluminium,coper is good conductor

Inhibitory neurotransmitters prevent the firing of neurons by binding with certain receptors, causing the influx of chloride ions to hyperpolarize the neuron. When this happens, it requires a much larger excitatory signal to override the inhibitory effects in order to allow the neuron to fire.

It is because if you have a key hole people can find the right shaped key and use it to open the door whereas if there is a password only you would know how to open the door

The force that causes negative charges to flow is the electromagnetic force. And we often apply the term voltageto the force that causes electron current to flow in what we normally think of as electricity.

Signaling system 7 is an international system used to communicate between telephone offices and other telecom systems. It conveys information about the status of each end of the call to the other. For example, it detects when the remote instrument is being rung and signals the originating office to play a "ringing" signal to the originating unit. It is also used for informing each end that the call has been answered and that it has been disconnected (later), which information is often critical for proper billing and for freeing up circuits that are no longer being used.

An instrument to be able to really tell the value is mandatory that the instrument does not load the circuit making it a false reading or inaccurate

loading effect which means when we give high load that may be cause to some fake or inaccurate of output, this may be known as loading effect....

The 1N4007 is a diode with forward current rating of 1 ampere, and a reverse voltage rating of 1,000 volts.

First we need to know the total resistance which means all series resistors add up and all parallel resistors equal the reciprocal of the reciprocal of the resistances added together.

R1 = 10ohm
R2 = 12ohm
R3 = 4ohm

( 1 / ( (1/R1) + (1/R2) ) ) = 5.4545ohm *approx
R = 5.4545 + R3 = 9.4545ohm *approx

Now that we know the total resistance we can use Ohm's Law to find current.
I = E / R (I = Current, E=Voltage, R=Resistance)

E = 20v
R = 9.4545ohm

I = 20 / 9.4545

So our Current is approximately 2.1153948
Using a scientific calculator will yield a more precise approximation

AF modulator. Audio signals produced by the microphone get amplified enough with the power to modulate the RF carrier wave generated by a RF oscillator.

used in rotary shaft encoder

Olmost always older amps...

sumthing ee

Turn the DC generator inside out and you have an alternator .

I think you mean 'Thevenin'! You need to check out an electrical textbook, as this is too complicated to explain without illustrations.

because scientists found that it can hair cancer coming from tooth decays.

Majority charge carriers in the N-type side of a semiconductor material are electrons, because N-type semiconductor is doped with a material with 5 valence electrons. Semiconductor materials have 4 valence electrons and hold tightly to 8, so there is a "loose" electron for every atom of dopant. Therefore most of the charge carriers available are electrons. IE, electrons are the majority charge carriers.

Minority charge carriers in N-type semiconductor are holes. Only a few holes (lack of an electron) are created by thermal effects, hence holes are the minority carriers in N-type material.

The situation is reversed in P-type semiconductor. A material having only 3 valence electrons is doped into the semiconductor. The semiconductor atoms have 4 valence electrons try to hold tightly to 8, so there is a virtual hole created by a "missing" electron in the valence orbit. This acts as if it were a positive charge carrier. Most of the charge carriers are these holes, therefore in P-type semiconductor holes are the majority charge carrier.

Again, reverse situation to minority charge carriers. Some electrons are loosened by thermal effects, they are the minority charge carriers in P-type semiconductor.