A simple electric circuit contains only a power supply and a resistor. When the power supply is off, there is no current in the circuit. When the power supply is turned on, the current almost instantly becomes a constant value. This situation can be modeled by a graph like the one shown at the right. I represents current in amps, and t represents time in seconds.
a. At what t-value is this function discontinuous?
b. When was the power supply turned on?
c. If the person who turned on the power supply left and came back hours later, what would he or she measure the current in the circuit to be?
