Physics for IGCSE & O level - Magnets And Currents (Section 1 - No. 2)
In the context of power transmission, what is the main purpose of high voltages?
To increase the current
To reduce the power loss
To make the cables smaller
To make the voltage safer
Giải thích
High voltages are used to reduce the power loss during transmission, since power loss is proportional to the square of the current.