Suppose two people A and B, A walk from a distance x at constant speed B is in a car travel same distance x at same speed. If the work done by A is [tex]W_A[/tex], what about the work done by B? Does B do any work? If do, what kinda of work done by B? We know that power is work per second, can I say power tells how fast the energy is consumed? So for a bulb with larger power means consuming energy faster? Thanks.