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Transformer ratios

N subscript 2 over N subscript 1 equals V subscript 1 over V subscript 2 equals I subscript 2 over I subscript 1

or 

V subscript 1 space I subscript 1 space equals space V subscript 2 space I subscript 2

or 

N subscript 1 space I subscript 1 space equals space N subscript 2 space I subscript 2

or

V subscript 1 over V subscript 2 equals N subscript 1 over N subscript 2

How can there be so many formulae for the same thing? There isn't. The second two are just simpler transpositions of the first one.

» Formulae