Bluetooth technology has three main output power classes: Class 1, Class 2, and Class 3. Class 1 devices can transmit up to 100 meters with a maximum output power of 100 mW, Class 2 devices typically reach about 10 meters with 2.5 mW, and Class 3 devices have a range of around 1 meter with 1 mW output power. These classes determine the range and power consumption of Bluetooth devices.
Total power output (Total RMS output): 1000 watts
The power output on a car battery will depend on how many cells the battery has. Each cell puts out 2.1 volts.
Total power output (Total RMS output): 1000 watts
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PMPO (Peak Music Power Output) is a marketing term used by audio equipment manufacturers to inflate power ratings. It does not represent a standard measure of power output and is often much higher than the RMS (Root Mean Square) power output. Without knowing the actual RMS power output of the device, it is not possible to convert PMPO to watts accurately.
1 How many windmills it takes to power a city depends on the amount and reliability of the wind, the power output of each windmill, and the power requirements of the city.
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High output could mean many things, but it probably means an electric motor with a lot of power for its size.
The Urei 6250 power amplifier has a power output of 250 watts per channel into 8 ohms.
PMPO stands for Peak Music Power Output. Its is one of many ways of rating the output capacity of speakers.
The actual answer is 360 degrees, that is, a class B amplifier will conduct for the entire 360 degrees of an input sine wave. However, the interesting part is how this is accomplished. For a "pure" class B amplifier, each of the two output power devices will conduct for 180 degrees of the total 360 degrees of a complete sine wave. This is because in a class B amplifier, each of the output devices is biased so that it is off when the input signal is zero. When the input signal goes positive, one of the output devices will conduct. Assuming there is no overall phase inversion in the amplifier, this would be the "upper" device that is connected to the positive voltage rail. In a typical solid state audio power amplifier, this device is usually an NPN transistor or power MOSFET. The "lower" device, typically connected to the negative voltage rail, will conduct when the input signal goes negative. This device will typically be a PNP transistor in a solid state amplifier, or a power MOSFET. There are many possible configurations for class B amplifiers. For example, with vacuum tube amps, there is usually only a positive voltage supplied to the output stage, and the two output tubes are identical types. Instead of connecting the lower tube to a negative rail, it is usually connected to ground, but since we are interested in AC amplification, and also since an output transformer is required to couple tube output stages to low impedance loads such as loudspeakers, this doesn't present a problem. The output transformer will have a center tap where the positive output stage voltage is connected, and each of the output tubes will conduct in alternating fashion, similarly to the output of a solid state amp. In fact, early solid state audio amps also used output transformers, and they typically also used two NPN transistors for output devices, in contrast to modern designs that use symmetrical matched pairs of NPN/PNP. At that time it was difficult to obtain high power matched pairs, whereas high power NPNs were relatively easy to obtain. A variation that is often used to obtain more power is the doubling of output devices by operating them in parallel to obtain higher current gain. It is possible to see six, eight, or even more devices operating in this way, but it will almost always be in multiples of two. Nevertheless, no matter what the variations, a class B amplifier will always conduct for 360 degrees of an input sine wave. There is an important qualification on this, however. A true class B amplifier is almost never seen, due to a problem called "crossover distortion." This occurs because any output device has a nonlinear region during turn-on from zero conduction. While the input signal is beginning to go positive, for example, the output device will not "follow" the input signal in a proportional manner. To overcome the distortion caused by this, most audio amps are operated in class AB, where each of the output devices is biased slightly on all the time. This technique virtually eliminates crossover distortion.