The Sankey diagrams below show the energy transfers in two light bulbs. The useful energy output for these light bulbs is carried to the energy stores of the environment by
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the higher the current the higher the mag field around it the higher the influence on the compass

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement

0 = 0.40 / 0 = 0

= 0.20 = 9.80 ⁄2 =?

=0 , = = 0.20 =0.50 0 0.40 ⁄

=0−122 =0−12(9.80 ⁄2)(0.50)2 =1.2