Charges flow unidirectionally from the source to the load or the circuit only. However, this is not the case with DC voltage. So the electrical charges flow from the source to the load in the first half cycle and from the load to the source in the negative half cycle. The average value in one cycle being equal to zero means the net voltage in a positive half cycle is equal in magnitude in the negative half cycle. This is because although these waveforms are alternating apparently, their average value in one cycle is not equal to zero.Ī voltage can be called an Alternating Current(AC) Voltage if and only if it alternates every half cycle and has an average value equal to zero in one complete cycle. However, in some electronic circuits, there are components that generate an alternating voltage waveform but those are called pulsating DC. It is the type of voltage that we get from batteries, DC generators, and other sources like sensors and transducers.ĭC voltages unlike AC don’t have a frequency which means they don’t alter every half-cycle. DC voltage stands for Direct current voltage.
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