Engine 2014: Electricity

1. A by applying torque in the opposite direction of rotation direction, the motor briefly regenerates power back into the mains, which  rapidly slows down the motor
2. B by applying torque in the same direction of rotation direction, the motor briefly regenerates power back into the mains, which rapidly slows down the motor
3. C by applying torque in the opposite direction of rotation direction, the motor briefly regenerates power back into the mains, which rapidly speeds up the motor
4. D by applying torque in the same direction of rotation direction, the motor briefly regenerates power back into the mains, which rapidly speeds up the motor

Tip: press A-D to answer