Find t1 and t2.
subject=physics
topic=equilibrium of forces

C. the electric current passes from the slip rings, through the brushes, and to the collection device.

Current supplied to consumers from generating plants like coal power plant, nuclear power plant, geothermal and others are in form of alternating current instead of direct current because it can be transported easily in a long distance. also, the alternating current has a wide range of frequency and the amount or energy can be increased or decreased.