A single resistor is connected across the terminals of a battery. Which one or more of the following changes in voltage and current leaves unchanged the electric power dissipated in the resistor? Explain .A) Doubling the voltage and reducing the current by a factor of two. B) Doubling the voltage and increasing the resistance by a factor of four. C) Doubling the current and reducing the resistance by a factor of four. a) A, B,C will leave the power unchanged b) A, B will leave the power unchangedc) B, C will leave the power unchangedd) only A will leave the power unchanged e) only B will leave the power unchanged

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