Answer to Question #112729 in Electricity and Magnetism for Sara

Question

An electrical mini speaker for home requires 9 V to function. The voltage of the electrical supply is 240 V. What is the turns ratio of the transformer that must be used? (Show and upload your work solution)

Answer 1

$a$ - turns ration of transformer can be found as $a={\frac {U_1} {U_2}}$

where $U_1=240 V$ - primary voltage and $U_2=9V$ - secondary voltage

Then $a={\frac {240} {9}}=26.67$