Final answer:
Current in a simple DC electric motor's loops is reversed every half rotation via a commutator and brushes, facilitating continuous rotation and consistent torque.
Step-by-step explanation:
In a simple DC electric motor, the current is reversed in the loops every half rotation. This is necessary to maintain a continuous rotation in the same direction. The reversal is achieved using a component called a commutator, which works in conjunction with brushes. The commutator flips the electric current as the loop rotates through certain angles, specifically at 0° and 180° (or 0 and π radians). This means the current changes direction twice per full rotation, resulting in a consistent torque that keeps the motor spinning.
Through this mechanism, electrical energy is effectively converted into mechanical work. If this process did not occur, the motor would not provide a substantial torque and would likely just oscillate rather than rotate continuously.