6. We consider the simple electric circuit shown in Figure: An electro- motive force (usually a battery or generator) produces a voltage of E (t) volts (V) and a current of I (t) amperes (A) at time t. Ohm's Law gives the drop in voltage due to the resistor as RI. The voltage drop due to the inductor is L (dildt). One of Kirchhoff's laws says that the sum of the voltage drops is equal to the supplied voltage E (t). Write the second-order differential equation. The independent variable is time t R E L switch