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# A transformer has $680$ turns in the primary coil and $85$ in the secondary coil. What kind of transformer is this, and by what factor does it change the voltage? By what factor does it change the current?

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$\color{#4257b2}\text{Givens:}$

We are given a transformer with the following parameters,

• $N_p= 680 \;\mathrm{turns}$: is the number of turns of the primary coil.

• $N_s= 85 \;\mathrm{turns}$: is the number of turns of the secondary coil.

We are required to,

Determine the type of the transformer.

Calculate the factor by which the voltage changes from the primary coil voltage $V_p$ to the secondary coil one $V_s$; the ratio $\frac{V_s}{V_p}$.

Evaluate the factor by which the current changes from the primary coil current $I_p$ to the secondary coil one $I_s$; the ratio $\frac{I_s}{I_p}$.

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