Isotonic exercises involve moving your joints and muscles rhythmically and repetitively through their ranges of motion using low resistance, while isometric exercises are static and require you to contract your muscles without joint motion.
Substations are normally outdoors and are enclosed by a wire fence. However in residential or high density areas, the substation may be indoors and housed inside a building to restrict the humming noise of the huge transformers. slide 2 of 6 View of a Substation
Why is it known as a âsubstation? Normally stations are where we catch trains and where people get on and off. By the same analogy we can explain what a substation does. Electricity has to be transmitted over large distances as the place where the power is being generated and the place where it is consumed can be far apart. The electricity is transmitted at very high voltages and low currents to reduce the heat, eddy currents, and other transmission losses.