Final answer:
Electricity is crucial for MU trains, supplying the power needed for acceleration and maintaining velocity. Energy conservation applies as produced and dissipated powers are equal, ensuring the train's motors and turbines receive a continuous supply of energy for efficient operation.
Step-by-step explanation:
Electricity plays a critical role in the functioning of Multiple Unit (MU) trains. The principle of energy conservation is essential in this context, where the produced and dissipated powers are equal. An example similar to a rail gun depicts the principle, but in MU trains, electricity is used to power motors that propel the train forward.
Electric train systems, such as light-rail commuter trains, draw significant power to accelerate and move. For instance, a train that requires 630 A of 650-V DC electricity will have a high power consumption rate and requires continuous power input to maintain the flow of current, which is essential for its acceleration and velocity.
In the power grid, turbines generate electricity without slowing down because the system continuously supplies energy to compensate for any losses due to work done on electrons. This also maintains the turbines in motion. Similarly, electric trains require a continuous supply of electricity to function effectively, taking advantage of overhead wires or a third rail to draw power without relying on batteries.