Each of the four circuits in the drawing consists of a single resistor whose resistance is either r or 2r, and a single battery whose voltage is either v or 2v. the unit of voltage in each circuit is v = 12 v and the unit of resistance is r = 6 ω. determine (a) the power supplied to each resistor and (b) the current delivered to each resistor.

Why is alternating current more effective at long–distance travel than direct current? a. the power lines are made out of conductors. b. transformers increase or decrease voltage as needed. c. the ac generator is more efficient. d. ac has lower voltage than dc.

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.

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