Power is defined as the rate of which an amount of energy is used to accomplish work. In the mechanical realm, we tend to use the term "horsepower" when describing how much energy a engine can develop. In electronics, we use the term WATT when describing the amount of power used by something.

As discussed in a previous class, whenever a given current flows through a wire or device, it causes a form of electrical friction. We call this friction RESISTANCE. This friction is caused by the moving of electrons through and between molecules within the resistor. This friction causes 2 other effects: Heat and Noise. The noise is called Johnson noise, and for now, we will ignore this effect, as it is very negligible.

The speed, or rate at which the heat is generated defines the power that the resistor consumes. This power consumption represents a loss, because we do not make use of the heat that is dissipated. It becomes important to know how much power a resistor is dissipating, because it will burn up if it can not withstand the heat. For this reason, resistors have both a resistance rating in Ohms, and a power rating in Watts. A resistor which is rated at 2 watts can safely dissipate 2 watts. If a 2 watt resistor is forced to dissipate 5 watts, it will burn up, and its resistance value will change accordingly.

The question then arises, "How do we calculate the amount of power dissipated by a resistor?"

The formula for power is not unlike Ohm's Law. As a matter of fact, it is called Ohm's Watts Law. And remembering the formula for Power is a piece of pie!

(Don't I mean a piece of cake?)

Nope.... PIE! You see, Power (P) is equal to the product of the Current (I), and the Voltage (E) in a given circuit.
Of course, using algebra, you can derive 2 other formula's from this one.

and

### Build a Low Noise And Drift Composite Amp Circuit Diagram

How to Build a Low Noise And Drift Composite Amp Circuit Diagram. This circuit offers the best of both worlds. It can be combined with a low input offset voltage and drift without degrading the overall system`s dynamic performance.
Low Noise And Drift Composite Amp Circuit Diagram

Compared to a standalone FET input operational amplifier, the composite amplifier circuit exhibits a 20-fold improvement in voltage offset and drift. In this circuit arrangement, A1 is a highspeed FET input op amp with a closed-loop gain of 100 (the source impedance was arbitrarily chosen to be 100 kfl). A2 is a Super Beta bipolar input op amp. It has good dc characteristics, biFET-level input bias current, and low noise. A2 monitors the voltage at the input of A1 and injects current to Al`s null pins. This forces A1 to have the input properties of a bipolar amplifier while maintaining its bandwidth and low-input-bias-current noise.

### High Power Output Amplifier TDA7294

The famous SGS-THOMSON ST Microelectronics has introduced a Hi-Fi DMOS high-power amplifier circuit TDA7294, its sound great taste bile, which due to its internal circuit from input to output are field-effect devices, rounded sound Mild, delicate Rounuan.  However, with its assembly amplifier, only TDA7294 single-output power is only 70 W, BTL access law is 100 W from top to bottom, do not feel that power cushion. The author several tests, used to promote TDA7294-level, direct-drive one to four pairs of high-power transistor parallel, the output of strong currents, the power output of 400 W (mono), and the circuit is simple and no need to debug that can reliably work Basically, the IC has maintained a sound and performance.  Ruzuo The figure below shows, R6 for the feedback resistor, the author of the value in debugging 22 k Î© more appropriate, R6 also decided this circuit gain, the gain value will increase.  Quiescent current depends on the power of R7, R8, when its value…

### Full Power Mobile Phone Jammer Circuit Diagram

Full Power Mobile Phone Jammer Circuit Diagram.To day if we are talking about expert Cell phone Jammers we are conversing about this schematic underneath. First off all you should be very very cautious how to use this apparatus. Its completely illegal and so the reason. I post this Circuit is only for educational and testing causes. This type of apparatus is being utilised by security for VIPS, particularly at their limousines to avoid blasting device initiating while the vehicle passes from the goal cell phone-bomb. Off course there are those who use it to make a antic or to make the persons crazy in the rectangle block you are.
The power of the jammer is currently sufficient to do your thing, but certainly you can place a 30W linear power amp at the RF output and impede a much wider locality. So, Be pleasant individual with that and recall that there are people who may need desperately to obtain or make a call and one of them could be you! And if you can't oppose of functioning …