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Tech Target
What Is: Alternating Current (Ac)
This site provides a brief explanation of what an AC current is.
Tech Target
What Is: Resistance
A short summary of resistance and how it is measured. Including information on AC and DC.
Concord Consortium
Concord Consortium: Sparks Tutorial: Finding the Cutoff Frequency
AC circuits with capacitors and inductors respond to the frequency, as well as the voltage. Find the frequency value that reduces the circuit power to half the maximum.