The former is called "step-up" while the latter is a "step-down" transformer.
When the current reaches those places where it is to be used a low voltage is again obtained by the step-down transformer.
When used on modern supply circuits of 220 volts a number of lamps may be run in series, or a step-down transformer employed.
For accurate results a step-down voltmeter transformer should be used on the testing circuit.
If the pressure or voltage of the secondary coil is less than that of the primary, we have a "step-down" transformer.