They are equations that shows the relationship between ratio of turns in secondary to primary coil and the ration of their voltages and consequently the current.
The first equation states that:
similarly, for an ideal transformer where no energy loss is experienced, the power in primary coil = power in secondary coil
Electrical power P is given by ; P = Current I x Voltage V
Let Ip =current in primary coil and Is = current in secondary coil
Then we have :
primary current x primary voltage = secondary current x secondary voltage
Ip x Vp = Is x Vs
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