Mark is trying to design a robot and is using a motor with a 5-volt circuit. The motor can only operate at a current between 100 mA and 120 mA. At 110 mA, the voltage drop over the motor is 1.1 volts. What size resistor should Mark put into the circuit to ensure that the current is no more than 120 mA? Be sure to include your units.
Emma needs to find a power supply for their robot’s drive train. She would like to use a 12-volt battery, but not sure if it will have enough power to move the robot. She needs to generate at least 1 Watt of power through the motor. At 12 volts, the motor has a voltage drop of 2 volts. She also knows the internal resistance of the motor is 40 ohms. Will she be able to generate enough power with a 12-volt battery?