The amount of work required to move a unit electric charge between two points is called

electro motive force (emf) is the amount of work required to move a unit electric charge between two points

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.