A heating element made of tungsten wire is connected to a large battery that has negligible internal resistance. When the heating element reaches 80.0o C, it consumes electrical energy at a rate of 480 W. What is its power consumption when its temperature is 150.0o C? Assume that the temperature coefficient of resistivity has the value given in Table 25.2 and that it is constant over the temperature range in this problem. In Eq. (25.12) take T0 to be 20.0o C.

Standing Waves (on 2 boundaries) Definition: Standing waves are the product of two waves of the same shape, amplitude, and frequency in superposition. Standing waves do not move left to right but appear to stay in place 1st harmonic (fundamental f) λ = 2L 2nd harmonic 1st overtone λ = L