2. Also known as forbidden band, energy required for valence electrons to become fre electrons.

Problem 11: Part (a)  At time t = 0 the switch is closed and current flows through the circuit. The current increases with time and eventually reaches a steady state value of imax. Calculate the maximum current imax in units of milliamps.  imax = ______ Part (b)  Write an equation that relates the current as a function of time i(t) to the maximum current, imax. Express the equation in terms of imax and α, where α = -t/τ.  i(t) = ______ Part (c)  Determine the time, in seconds, at which the current has a value of i(t50) = 50% of imax.  t50 = ______

Basic Electrical Engineering You have been sent to a new home. The homeowner reports that sometimes the electric furnace trips the 240-V, 60-A circuit breaker connected to it. Upon examination, you find that the furnace contains three 5000-W heating elements designed to turn on in stages. For example, when the thermostat calls for heat, the first 5000-W unit turns on. After some period of time, the second unit will turn on, and then, after another time delay, the third unit will turn on. What do you think the problem is, and so would your recommendation for correcting? Explain your answer.

Electrical Engineering Major. Course: EE350 ( System Dynamics and control ).