Problem 1: A current of 22 ?A was passing through a wire.
Part (a) Express charge Q passing through the wire in terms of the current I and the time interval Delta t.
Part (b) In a time interval of Delta t = 54 s, how much charge has passed through the wire in ?C?
Problem 2: The filament of an incandescent light bulb is made of tungsten which has a thermal coefficient of resistivity of ? = 4.4 x 10-3K-1. The filament is initially at room temperature, To = 293 K. When it is connected across a V = 80 volt power supply the filament quickly heats up to T = 2700 K at which time the current flowing through the filament is I = 0.65 Amps.
Part (a) Write an equation for the initial current, I0, that flows through the filament when it is initially turned on. (e.g., when it is still at room temperature).
Part (b) Find the numerical value of the current in amps when the filament is at room temperature.