Current Type RNAV
If you pass an electric current (of any type) through a wire, a magnetic field will be generated. Some may have seen this at school when iron filings "line up" with the magnetic field when a current is passed in a wire next to them. However, this situation is with direct current — the magnetic field establishes itself and then remains constant and unchanging.
To create a wave, you have to vary the current in the same way as the wave. This type of current is called alternating current, or ACAC —1) Met: Altocumulus2) Electrics: Alternating Current.