A step-down transformer contains a primary coil and a secondary coil wrapped around a soft-iron core. The primary coil is linked to a $6.0\,\text{V}$ direct current (d.c.) supply. Which statement about the transformer is correct?
- AThe output voltage is equal to $6.0\,\text{V}$.
- BThe output voltage is greater than $6.0\,\text{V}$.
- CThe output voltage is less than $6.0\,\text{V}$ but more than zero.
- DThere is no output voltage.