12/13/2023 0 Comments Waves Complete 14 (09.08.23) freeFrom left to right: G=generator, U=step up transformer, V=voltage at beginning of transmission line, Pt=power entering transmission line, I=current in wires, R=total resistance in wires, Pw=power lost in transmission line, Pe=power reaching the end of the transmission line, D=step down transformer, C=consumers.Įlectrical energy is distributed as alternating current because AC voltage may be increased or decreased with a transformer. Main articles: Electric power transmission and Electric power distribution A schematic representation of long distance electric power transmission. These currents typically alternate at higher frequencies than those used in power transmission. These types of alternating current carry information such as sound (audio) or images (video) sometimes carried by modulation of an AC carrier signal. ![]() Audio and radio signals carried on electrical wires are also examples of alternating current. In certain applications, like guitar amplifiers, different waveforms are used, such as triangular waves or square waves. The usual waveform of alternating current in most electric power circuits is a sine wave, whose positive half-period corresponds with positive direction of the current and vice versa (the full period is called a cycle). The abbreviations AC and DC are often used to mean simply alternating and direct, respectively, as when they modify current or voltage. A common source of DC power is a battery cell in a flashlight. Alternating current is the form in which electric power is delivered to businesses and residences, and it is the form of electrical energy that consumers typically use when they plug kitchen appliances, televisions, fans and electric lamps into a wall socket. ![]() Alternating current ( AC) is an electric current which periodically reverses direction and changes its magnitude continuously with time, in contrast to direct current (DC), which flows only in one direction.
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