Using high voltage directly without decreasing would be very inconvenient and dangerous.įor historical reasons, the frequency of the electrical system varies by country 50 and 60 Hz are common frequency values. This high voltage is transformed into a safer 110 or 220 V voltage for safer use. In the transmission lines that carry electrical energy from the power generation station to consumers, high voltage up to hundreds of kilovolts is used to reduce the energy lost as heat in wires. In this calculator description, however, we will talk only about sine waves. For example, an electric guitar string, when plucked, produces periodic oscillation at several of its modal frequencies at the same time, which gives the sensation that several frequencies are played at the same time. The waveform of alternating current can be not only sinusoidal like in wall sockets - an AC waveform can take any shape, which is not necessarily periodic. Single-phase pole-mount distribution transformer supplying 120 V installed in a residential area in Canada Four powers instead of just one for DC sounds too complicated? That’s OK - we will try to figure out how it works. Instead of just DC power in DC circuits, here we talk about four kinds of power in AC circuits: active power, P, reactive power, Q, complex power, S, and apparent power, | S|. Therefore, this calculator that is used to calculate the AC power, is more complicated in comparison with the DC power calculator. Unlike DC current that flows only in one direction, alternating current periodically reverses direction and changes its amplitude with time. Here we will discuss the calculation of electrical power in single-phase AC circuits. There we discuss the fundamental concept of electrical engineering: charge, current, voltage, and power, and the units of their measurement. For a much more simple case of calculating DC power, please use our DC Power Calculator.
Note that the abbreviation AC usually means “alternating” and the phrase “AC current” is not a tautology. This calculator is used to calculate AC power and everything that is said here refers mainly to alternating current.
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