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Problem: The secondary coil of a step-up transformer provides the voltage that operates an electrostatic air filter. The turns ratio of the transformer is 45:1. The primary coil is plugged into a standard 120-V outlet. The current in the secondary coil is 1.2 x 10^-3 A.

1- Find the power consumed by the air filter.

I want you to explain the physics in this problem.

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