Answer:
1. The voltage of the electricity is first reduced to required value by a step-down transformer before its transmission to buildings or houses.
2. The primary and secondary coils in a transformer have the same principle.
Step-by-step explanation:
In most cases, electricity is transmitted at a high voltage but low current through the outside power lines to reduce wastage and melting of power lines. This high voltage is reduced to consumable value to buildings by a step-down transformer in a community. After the voltage has been reduced, the transformer redistribute the safe electricity to various houses or buildings as required.
A transformer consists of the primary and secondary coils. The number of turns in each coil determines what type of transformer it is. The coils have different voltages and currents but the same principle.