下面给大家分享的是一道SAT2的物理真题及其解法。 The set of lettered choices below refers to multiple questions. Select the one lettered choice that best answers each question. A choice may be used once, more than once, or not at all in each set. Which graph represents the total heat developed from time by a resistor carrying a steady current? Answer Choices (A) (B) (C) (D) (E) The correct answer is A Explanation Difficulty: Easy The correct answer is a steadily increasing amount. The rate of heat dissipation by a resistor is equal to the power it expends. The power is related to the current and the resistance by the equation , so if the current is constant the power is constant. The total heat developed is then the power multiplied by the total time . The graph is thus a steadily increasing function of time. SAT2物理真题是备考SAT2物理考试很好的参考材料，希望以上的分享对大家的备考有所帮助。
|