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For example, if two identical amplifiers (each rated for operation into 4 ohm) are paralleled into a 4 ohm load, each amplifier sees an equivalent of 8 ohm since the output current is now shared by both amplifiers — each amplifier supplies half the load current, and the dissipation per amplifier is halved.
A dual of a relationship is formed by interchanging voltage and current in an expression. The dual expression thus produced is of the same form, and the reason that the dual is always a valid statement can be traced to the duality of electricity and magnetism. Here is a partial list of electrical dualities: voltage – current
In building wiring, multiway switching is the interconnection of two or more electrical switches to control an electrical load from more than one location.A common application is in lighting, where it allows the control of lamps from multiple locations, for example in a hallway, stairwell, or large room.
The Stratocaster set of Vintage Noiseless pickups comes packaged with two 1 MΩ potentiometers ("pots") and a 0.022 μF capacitor for tone controls, [11] one 500 kΩ pot for volume control, a 680 pF capacitor and a 220 kΩ resistor for a treble bleed circuit, [12] and a wiring diagram. [13]
A great deal of THWN wire is actually dual-rated, and meets THHN the specification as well, so may be used in wet environments up to 75°C or dry environments up to 90°C. An extended specification, THWN-2 permits use in wet locations and conductor temperatures up to 90°C simultaneously. [18]
There is also a dual version of Miller theorem that is based on Kirchhoff's current law (Miller theorem for currents): if there is a branch in a circuit with impedance connecting a node, where two currents and converge to ground, we can replace this branch by two conducting the referred currents, with impedances respectively equal to (+) and ...
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These are robust, purpose-built amplifiers with many application-specific design features such as overcurrent protection and aggressive high-pass filtering for flyback voltage protection. Some models can be configured so that one channel drives one or two low impedance 8-ohm speakers while the other drives a constant-voltage string of speakers. [3]