An ingenious mechanical linkage called a pantograph allows a sliding contact bar to remain pressed tight against the overhead traction power wire. read more
According to the Union University Department of Physics, when an electric current passes through a solid copper wire, the electrons move forward, but the protons within the positive atoms of copper do not. Electricity travelling through a wire moves at an extremely fast speed and is capable of powering anything from a light bulb to a laptop. read more
They can move through the wire in something that’s called an electric current. Moving charge is an electric current and we use that to push power through wires. The electric grid is one of the most complicated things ever built by humans. It’s this vast interconnection of wires and various components like transformers and power substations. read more