The mathematical expression for the change in free energy of a system is δg =δh - tδs. which of the following is correct? the mathematical expression for the change in free energy of a system is δg =δh - tδs. which of the following is correct? t is the temperature in degrees celsius. δh is the change in entropy, the energy available to do work. δs is the change in enthalpy, a measure of randomness. δg is the change in free energy.

Abox that has self-contained cable clamps holds two light switches. a two-wire no. 12 cable with ground feeds the box, and a pair of two-wire no. 12 cables (four conductors) with ground wires leaves the box to feed the light fixtures. the second switch is fed by a no. 12 jumper wire from the first switch. which one of the following box combinations would furnish the minimum allowable volume? a. two 3-inch × 2-inch × 21⁄2-inch gangable device boxes b. two 3-inch × 2-inch × 11⁄2-inch gangable device boxes c. two 3-inch × 2-inch × 23⁄4-inch gangable device boxes d. two 3-inch × 2-inch × 21⁄4-inch gangable device boxes