These circuits show how to change an oscillating voltage (commonly called AC) to DC. The term AC means
Alternating Current but it really means Alternating Voltage as the rising and falling voltage produces an increasing and
decreasing current.
The term DC means Direct Current but it actually means Direct or unchanging Voltage.
The output of the following circuits will not be pure DC (like that from a battery) but will contain ripple. Ripple is
reduced by adding a capacitor (electrolytic) to the output.
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