A 150 W heating coil (like a light bulb) is designed to operate from 125 V. The coil is made from a filament with a temperature coefficient of a = 2.3x10-3 /°C. When the filament is connected to 125 V, it is hot and glowing and its temperature is 5 times room temperature. What is the resistance of the filament (in ohms) at room temperature? Take room temperature to be 20 °C.

A 150 W heating coil (like a light bulb) is designed to operate from 125 V. The coil is made from a filament with a temperature coefficient of a = 2.3x10-3 /°C. When the filament is connected to 125 V, it is hot and glowing and its temperature is 5 times room temperature. What is the resistance of the filament (in ohms) at room temperature? Take room temperature to be 20 °C.