The RMS value of the AC sinusoidal gives the information of delivering the same power by the corresponding DC source. Accessed 31 Oct. 2020. If a radius vector of a circle rotates around its center at a constant speed, the vertical projection of the vector can be plotted as a sine wave. The above graph shows that DC can be represented by only magnitude and direction while these terms are insufficient for AC. The only difference between a generator and a motor is that a motor converts electrical energy into mechanical energy. Where $E_{m}$ shows the peak voltage of the voltage waveform and $\omega $ is the angular velocity of the waveform. And that portion of the waveform is called cycle. If an AC circuit is hooked up to an oscilloscope and its voltage is plotted over time, you are likely to see several different waveforms such as sine, square, and triangle – sine is the most common waveform and the AC in most mains-wired buildings have an oscillating voltage in the sine wave form. The following animation shows the behavior of AC current through the resistor, assuming that the magnitude is changed according to the waveform. This current can change direction periodically, and the voltage in an AC circuit also periodically reverses because the current changes direction. This means that every half rotation of the wire changes the direction of the current. The trace of the quantity i.e. 'Nip it in the butt' or 'Nip it in the bud'. In an alternator, a loop of wire is spun rapidly inside of a magnetic field. Shahab Yousafzai is a professional electrical engineer, who has a history with the field since 2008. is called instantaneous value. “Alternating current.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/alternating%20current. An alternator is an electrical generator that produces alternating current. (Source: Public Domain). The phase relation of two or more waveforms can be found through an analog and digital oscilloscope. As the wire spins and periodically enters a different magnetic polarity, the voltage and current alternate on the wire. The basic mathematical format for sinusoidal voltage is. The alternating current is the common form of electrical power generated and distributed due its ease of generation and distribution. Please tell us where you read or heard it (including the quote, if possible). The Alternator. Alternating Current reverses direction in equal intervals of time It is denoted by AC or a.c Positive Negative Polarity is not fixed and keep on changing Uses It is used to transmit current over long distance without much loss of current Most of power stations in India generate Alternating Current This provides AC an advantaged well above DC in the realm of power distribution because, as mentioned above, transmitting electrical power over long distances is a lot more efficient with higher, stepped-up voltages and smaller, stepped-down currents. is called a waveform. The speed at which the vector rotates is called angular velocity.

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