灯L1标有"6V 6W",L2标有"6V 3W"将他们串联在电路上,两灯实际功率为多少?
问题描述:
灯L1标有"6V 6W",L2标有"6V 3W"将他们串联在电路上,两灯实际功率为多少?
答
灯L1灯丝电阻为R1=V^2/P1=36/6=6欧 L2的电阻为 R2=V^2/P2=36/3=12欧将他们串联在6V电路上,电路电流为I=v/(R1+R2)=6/18=1/3AL1实际功率为P1=I^2R1=(1/3)^2*6=2/3W L2实际功率为P1=I^2R2=(1/3)^2*12=4/3W...