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. Find the power consumed by the air filter.

The power consumed by the air filter is 6.48 watt.

Explanation:

 Since

The power used by filter is

and we know that

but we need current in primary coil that is

Substituting this into the equation of the power we get

P  = ()(45/1)(120)

we get

P = 6.48 watt

This the power consumed by the air filter.

i would think klcio3

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