论文部分内容阅读
[题目]在图1所示电路中,电源电压为30V,电阻R=30Ω,滑动变阻器的最大阻值为50Ω.(1)在滑动变阻器的滑片P由a端滑到b端的过程中,电压表的最大读数是多少?(2)若所用电压表的量程为0～15V,要使它接在电路中不烧坏,滑动变阻器的滑片P只能在阻值多大的范围内滑动?(3)若把一只量程为0～0.6A的电流表接在图中C、D两点上,为了不损坏电流表和电压表,滑动变阻器的滑片P只能在阻值多大的范围内滑动?
[Item] In the circuit shown in Fig. 1, the power supply voltage is 30V, the resistance R is 30Ω, and the maximum resistance of the sliding rheostat is 50Ω. (1) In the process where the sliding plate of the sliding varistor slides from the a-end to the b-end, What is the maximum reading of the voltmeter? (2) If the range of the voltmeter used is 0 to 15V, and if it is connected to the circuit without burning out, what is the sliding plate of the sliding rheostat? (3) If a current meter with a range of 0-0.6A is connected to C, D in the figure, in order not to damage the ammeter and voltmeter, the sliding plate of the sliding rheostat can only slide within the range of the resistance value. ?