A physics student is studying the effect of temperature on the resistance of a current carrying wire. She applies a voltage to a iron wire at a temperature of 59.0°C and notes that it produces a current of 1.30 A. If she then applies the same voltage to the same wire at -88.0°C, what current should she expect (in A)? The temperature coefficient of resistivity for iron is 5.00 x 103 (°C)-1. (Assume that the reference temperature is 20°C.) 1.12 x See if you can use Ohm's law and an expression for the resistance as a function of the temperature to write an expression for the potential difference across the wire for the hot and cold case. Since the potential difference across the wire is the same for the hot and cold case, how can you determine the cold case current? A

A physics student is studying the effect of temperature on the resistance of a current carrying wire. She applies a voltage to a iron wire at a temperature of 59.0°C and notes that it produces a current of 1.30 A. If she then applies the same voltage to the same wire at -88.0°C, what current should she expect (in A)? The temperature coefficient of resistivity for iron is 5.00 x 103 (°C)-1. (Assume that the reference temperature is 20°C.) 1.12 x See if you can use Ohm's law and an expression for the resistance as a function of the temperature to write an expression for the potential difference across the wire for the hot and cold case. Since the potential difference across the wire is the same for the hot and cold case, how can you determine the cold case current? A