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## Homework Statement

An outdoor heater has a resistance of 50 ohms and operates at 275 V. A transformer connected to a 120-V source supplies electricity to the heater. What is the power used by the transformer?

## Homework Equations

P = V^2/R

## The Attempt at a Solution

I plugged in the values V and R from the heater and calculated to get 1512.5 W. This is, coincidentally, the answer on my answer key, but I don't understand why...Why does calculating the power of the object give me the power of the heater and where does the 120-V part come in? :/