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# AC Josephson effect

nosplit "Josephson effect" words: 365
This is what happens when you apply a DC voltage across a Josephson junction.
It is called "AC effect" because when we apply a DC voltage, it produces an alternating current on the device.
By looking at the Josephson equations, we see that a positive constant, then just increases linearly without bound.
Therefore, from the first equation: $$I(t)=Ic​sin(φ(t)) (1)$$ we see that the current will just vary sinusoidally between .
Wikipedia mentions that this frequency is , so it is very very high, so we are not able to view individual points of the sine curve separately with our instruments.