A visco-elastic material is one with both the properties of a liquid and the properties of an elastic solid. The combination of these two types of properties is excellent when it comes to absorbing or spreading energy because these two types of materials deal with energy in different ways.
Electric and magnetic fields (EMF) are invisible lines of force that surround any electrical device. Electrical wiring, electrical equipment and power lines all produce electric and magnetic fields. Electrical fields and magnetic fields can be characterized by their wavelength, frequency and amplitude (strength).
The relationship between power (measured in Watts) and electrical current (measured in Amperes or Amps) is one of my favorites because electrical power and mechanical power are all measured in the same Watts. An ampere is how many coulombs (think of a coulomb as a big scoop of electrons) pass through a conductor in one second: