An Alternating current which is commonly referered as AC, which is a type of current that will alternate between a positive and negitive charge, and this charge will fluctuate between voltages.
If your house is being supplied with 240 volts then the AC current will fluctuate between 240v to -240v, and it will aternate between the voltages on a set timer.
While a direct current or DC current is either a positive or negitive charge, since the positive charge is consistant, the most common use is in which makes it good for cells and batteries.
We can get graphs of the potental difference from the current is via a Oscilloscope, which measures the potental difference a current is producing by displaying it on a monitor, these monitors display the current in a wave.
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