誰人可給我phy tas Phase difference in CR and LR circuit??(贈點: 15)

phase difference between the p.d. and the current : π/2 ( theoretical value) /less than π/2 ( exptal value if R is large)
If R is larger than before, phrase difference is less than π/2
this is because current is compared with p.d. across L and R, rather than that across L.
the same apply to RC and LR circuit.