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
Electrical substations are a part of an electricity generation, transmission and distribution system where voltage is transformed from high to low or in reverse using transformers. The general functions of a substation may include: Voltage transformation. Connection point for transmission lines.