weather map
wind rose
Wind rose
Wind and ocean currents
Because the rotation of the earth 'drags' the air currents with it - creating eddys and currents with differing strengths and directions.
The sine wave at low frequency is unstable because it can create strong currents that nobody can stop them from
Knox McIlwain has written: 'High-frequency alternating currents' -- subject(s): Alternating Electric currents 'Principles of color television'
Lochan Singh has written: 'The attenuation of high frequency currents in a coaxial pair'
A changing magnetic field generates an electric field and alternating currents are accompanied (or caused) by alternating voltages.
E. Bellis Clayton has written: 'Electrotherapy with the direct and low frequency currents'
I'm not sure why, but I think there are tides underwater. I watched a video about the Marianas trench and there were tide marks in the seaweed lining a particular cliff. They hypothesized that it was because of the extreme depth in combination with particular rhythmic currents.
It is an alternating current that switches its polarity 60 times in a second. 60 Hertz is the frequency that electricity is generated in the U.S.
A sonometer is used to determine the frequency of alternating current. A step down transformer is used for the determination of frequency of A.C. because the voltage of the A.C. mains is 220V, which is dangerous. The step down transformer reduces this voltage to 6 volts.