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1.用有效值 交流电的有效值根据直流电在同阻值、同时间的条件下产生的焦耳热相同来定义,所以有效值是化变为恒的一条思路. 例1 如图1所示,匀强磁场的方向垂直纸面向里,磁感应强度B=0.20T,OCA导轨与OA直导轨分别在O点和A点接有阻值R1=30Ω和R2=60Ω,大小可忽略的定值电阻,导轨OCA的曲线方程为y=1.0sin(πx)/3(m),金属棒ab长
1. The effective value of the effective value of the alternating current is defined according to the same Joule heat generated under the condition of the same resistance and the same time as the direct current, so the effective value is a thought of changing into a constant. Example 1 As shown in Figure 1, The direction of the strong magnetic field is vertical. The paper is facing inward. The magnetic induction intensity is B=0.20T. The OCA rail and the OA straight rail are connected at points O and A respectively with resistance R1=30Ω and R2=60Ω. OCA’s curve equation is y=1.0sin(πx)/3(m), metal rod ab is long