Electronics Engineering

You need to use the formula E = IR + Ir

where: E is the e.m.f. of the power supply (the theoretical maximum voltage across the terminals when no current is flowing)

I is current

R is resistance of the circuit (load resistance)

and r is the internal resistance of the power supply.

Therefore, you can rearrange this formula to give r:

E = IR + Ir (Subtract IR)

E-IR=Ir (divide by I)

(E-IR)/I=r or r=(E-IR)/I

fuse

Resistance is the property of a component which restricts the flow of electric current.

In brief and in the most general terms, a transistor is a 3-terminal semiconductor device capable of changing its resistance in a "controlled" way. It is like the valve (the hose bib) that you open to turn on the water to your hose. The valve allows you to apply a little energy (from your hand) to control lots of energy (the water pressure). That's amplification. Let's peek in on this and make some simple comparisons. A transistor has an emitter, a collector and a base. The emitter and collector could be considered "input and output" terminals in the most basic sense. As for the base, it is the "control terminal" just like the handle on the faucet. By applying a small voltage to the base to "turn on" the device, we can get current to begin flowing. First a little, and then, by turning it on more, a lot. Eventually the device will be "all the way on" and will be allowing maximum current to flow through it. The opposite will be true when we turn the device off. That's it. Oh, but let's take a moment to look at the implications, shall we? Imagine turning on the water really, really fast. Like almost instantly on. Then off the same way. By turning the transistor on and off "instantly" and looking at the result, we'd get "ons" and "offs" from it. That's 1's and 0's there, and it's binary. That's how we can make a digital signal. And this process is exactly at the heart of how the microprocessor in all digital computers works. You probably saw that coming. Let's look at one other thing. You're familiar with sound, which is mechanical energy. It's like a vibrating string on a guitar or the membrane ("skin") on a drum, just to cite a pair of examples. That movement creates harmonic or oscillating motion and the sound. If we want to create the electrical equivalent, we have to open and close that water valve as quickly as the frequency of the vibrations. That's not really possible with the valve, but with the transistor, we can apply a changing voltage to the base as fast as any "regular" mechanical vibration. If a string vibrates at 1000 cycles per second (1000 Hertz), we can change the voltage to the base at that rate. Let's slow the action down. Note that we start turning on the transistor, then we turn it on a bit more, then a bit more. At some point we've reached a "peak" and then we start turning it off, and off a bit more and off a bit more until it's off. The rateat which we do this corresponds to the frequency of the signal being amplified by the transistor. And how far we actually turn the transistor on before turning it back off corresponds to the amplitude of the signal we are working with. The transistor has largely replaced the vacuum tube, which was originally called an electronic valve. Having wandered around in this discussion, you may be able to see why the terminology (which is a bit "old school" now) can still be fairly applied - even to the transistor.

The voltage applied and the resistance across it.

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A: The procedure is very simple must have a voltmeter and must have a very low value of shunt in series with the circuit whereby the IR drop will be converted into amps. That works for DC only. For AC the signal is rectified and then measured or a flux clamp can measure the current

Increase the voltage across the resistor by 41.4% .

The current that is transferred through cables over long distances is AC. The main reason for this is because it is easier to handle. For example, it is easy to convert an AC current to a higher or a lower voltage with transformers. Transformers don't work for DC.

rectifier, it is a n electrical device that converts ths high votage carrying AC to low voltage carrying DC

Yes. You need two gated input SR flipflops, and an inverter.

Connect the Q output of the first flipflop to the S of the second.

Connect the notQ output of the first flipflop to the R of the second.

Connect the clock to the gate input of the second flipflop, and to the input of the inverter.

Connect the output of the inverter to the gate of the first flipflop.

The potential across a pn junction is called potential barrier because majority charge carriers have to overcome this potential before crossing the junction.

rotating anode

1)During a operation large shaped disc tungsten anode rotate at speed 3000 t0 9000rpm(resolution per minute).

2)A motive force to rotate the anode is given by induction motor.therefore windings of which is housed outside the tube.

3)a design element help to limit power density delivered on the physical focal spot while making a small effective focal spot.

4)with rotating anode,heat is produced during exposure is spread over the large area of anode.thereby increases the heating loading capacity of the tube and allowing high power level are used as a result which produces the x radiation.

5) by increasing the anode voltage x rays which produces the shortest wavelength this is used to therpeutic.

by decresing the anode current which produces the longest wavelength this is used for diagnostic process.

In case of parallel circuit the effective resistance is given by

Reff = R1*R2*R3 /(R1R2 +R2R3 +R3R1)

As short circuit takes place then anyone R1,R2,R3 becomes zero. Hence Reff becomes zero.

A block diagram of monochrome TV transmitter can be written out on paper. The diagram is broke don on drawn blocks and in the blocks is data that is used to explain monochrome TV transmitter.

Answer Pmax=E^2/(4xRs)

The maximum power is transferred when the load impedance is the complex conjugate of the source impedance. For a dc circuit or a purely resistive circuit, the load resistance equals the source resistance.

let me answer you in layman terms. you can say 1000VA means 1000watt (like in DC circuit).

All electrical devices are made of various components. Two very important components which you would find in almost all the electrical devices are capacitor and inductor.

Now due to these components you will not receive all the power i.e.1000watt.

It might be 980watt. Now the actually power was 1000, which is called apparent power,

but power transmitted was 980, which is called, real power because that is what reached at the end terminal.

But in real terms volt-ampere or VA is unit of apparent power in an AC circuit containing capacitive or inductive reactance(reactance is opposition caused by electronic components to ac current due to capacitance or inductance). Apparent power is the product of source voltage and current i.e. 1VA is the power dessipated when one volt produce one ampere current.

A parallel resonant circuit has at its heart an inductorand a capacitor. These are the two parallel components. They each react to voltage and current 180 degrees out of phase with each other. When we "hit" this circuit, called a parallel tank circuit, or just a tank, with voltage, one component is "putting energy into the circuit" while the other one is "storing it up" and then the two components switch roles. The result is that the tank will oscillate, and the frequency of oscillation will be determined by the value of the capacitor and the inductor.

wire will move - there is a force acting on it.

it's direction depends upon the orientation of current and magnetic field - a nice way to see this is by looking op a Google picture of Fleming's left hand rule.

the force depends upon the strength of magnetic field, current and length of conductor (perpendicular to field) in the magnetic field.

One jk flip-flop with j=k=1 should be added to the system so that it's modulus becomes 16 instead of 8.

Use a multimeter that has both scales on it . All you need to do is change the scale from AC to DC