The transformer circuit above steps up a one volt input to ten volts. It does so at the expense of current gain. The primary circuit power is one watt [P = VA = 1 X 1 =1 watt] and the power in the secondary is also one watt [P = VA = 10.0 X 0.1 =1 watt] A transformer can be used to amplify a signals voltage also, but only at the expense of current. Even an ideal transformer only results in a power gain of unity.
Transformers can step power line voltages high enough to cause huge arcs. That is why insulators get larger the higher the voltage and thus the E fields get stronger and ionizes air.
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