Alternating Current

A step down transformer is used to reduce the main supply from '\(V_1\)' volt to '\(V_2\)' volt. The primary coil draws a current '\(\mathrm{I}_1\)' \(\mathrm{A}\) and the secondary coil draws '\(\mathrm{I}_2\)' A. \((\mathrm{I}_1<\mathrm{I}_2)\). The ratio of input power to output power is