Ohm's law states that \(V = I R\) for a simple circuit, where \(V \) is the total voltage, \(I\) is the amount of current running through the resistor and \(R\) is the resistance of the resistor. If \(I = 40\) amperes when \(R = 3\) ohms, find the amount of current (in amperes) when the resistor has a resistance of \(20\)ohms. Assume voltage remains constant.