Please answer the following questions thoroughly A tungsten wire heats up to nea
ID: 1408349 • Letter: P
Question
Please answer the following questions thoroughly
A tungsten wire heats up to nearly 1800 K in a lightbulb. What happens to the current, voltage, and the resistance as the wire heats? What happens to the power which must be dissipated as heat as the temperature increases? Students in a physics class create their own analogies for electricity. One student decides to use the Cub Scout Pine Wood Derby as an analogy/model. What might represent the charge, current voltage, wire, or battery? If nothing represents one or more of these items, tell us which items cannot be represented. For the rest, explain how they represent them well. Identify one way this model fails. Double-A rechargeable batteries for cameras now give their ratings as, say 2100 mAhr as well as the usual 1.5V. Which quantity does this 2100 mAhr best describe (power, energy, voltage, current or charge.....)Explanation / Answer
when temperature is increased,the thermal kinetic energy(kT) of charge carriers in the wire increases.so the resistance offerred by the wire decreases.the voltage of the bulb is equal to the voltage of source and it is constant.using ohms law the current flow in the wire increases.
the power dessipated in the wire is,
P=VI
as current increases the power dessipated in the wire increases.