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## Homework Statement

A 75.0 W bulb is connected to a 120 V source. A lamp dimmer puts a resistance in series with the bulb. What resistance would be needed to reduce the current to .300 A?

## Homework Equations

R=V/I

## The Attempt at a Solution

R=120/.3A=400 ohms. The answer is 210 ohms. What am I missing?