1.0.75W 0.2W (P=UI)
2."36V 60W" "220V 60W " 相等 (I=P/U R=U^2/P Q=I^2*R*t)
3.1 2 2 (P=UI Q=I^2*R*t)
4.220V 40W 0.18A 1212Ω (I=P/U RU^2/P)
5.串 6Ω 1.5W (I=P/U=3W/6V=0.5A RL=U^2/P=(6V)^2/3W=12Ω R=U/I=9V/0.5A=18Ω R0=R-RL=18Ω-12Ω=6Ω P=I^2*R )
1.0.75W 0.2W (P=UI)
2."36V 60W" "220V 60W " 相等 (I=P/U R=U^2/P Q=I^2*R*t)
3.1 2 2 (P=UI Q=I^2*R*t)
4.220V 40W 0.18A 1212Ω (I=P/U RU^2/P)
5.串 6Ω 1.5W (I=P/U=3W/6V=0.5A RL=U^2/P=(6V)^2/3W=12Ω R=U/I=9V/0.5A=18Ω R0=R-RL=18Ω-12Ω=6Ω P=I^2*R )