Transformer design calculation excel6/11/2023 With a step-up transformer, the load voltage will be greater than the supply voltage. Now suppose we analyze a circuit containing a step-up transformer (one with more turns of wire in the secondary coil than in the primary coil). If we calculate power output by the source and power dissipated by the load, the value is the same: 420 Watts (P = IV). If an isolation transformer (a transformer with the same number of “turns” in the primary and secondary coils) is connected between an AC source and an AC load, we will measure the same voltage and the same current at both source and load terminals:
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