Choose the correct definition for electrical current. A. The amount of energy transferred by a charge moving between the points per distance between the points. Its units are volts, which are equivalent to joules per meter.
B. The amount of energy transferred per unit of charge moving between the points. Its units are volts, which are equivalent to joules per coulomb.
C. The time rate of flow of net charge through a conductor or circuit element. Its units are amperes, which are equivalent to coulombs per second.
D. The time rate of flow of energy through a conductor or circuit element. Its units are amperes, which are equivalent to joules per second.

Acommercial grade cubical freezer, 4 m on a side, has a composite wall consisting of an exterior sheet of 5.0-mm thick plain carbon steel (kst= 60.5 w/m k), an intermediate layer of 100-mm thick polyurethane insulation (kins 0.02 w/m k), and an inner sheet of 5.0- mm thick aluminium alloy (kal polyurethane insulation and both metallic sheets are each characterized by a thermal contact resistance of r 2.5 x 104 m2 k/w. (a) what is the steady-state cooling load that must be maintained by the refrigerator under conditions for which the outer and inner surface temperatures are 25°c and -5°c, respectively? (b) for power saving purpose, which wall material should be increased/reduced in. thickness in order to reduce 50% of the cooling load found in part (a)? redesign the thickness of the proposed material. 177 w/m-k). adhesive interfaces between the q=575.93 w