V=s/t
I=U/R
P=UI=I2R=U2/R
P=w/t
w=UIt=I2Rt=U2t/R
ρ=m/v
FlL1=F2L2
G=mg
P=F/s
P=ρgh
F浮=ρgV=G排
μ=W有/W总＝Gh/FS
Q=mq=vq
Q=cmΔt