Chapter-7|Alternating Current |NCERT 12th Physics:
AC Voltage Applied to a Resistor:
Let a resistor of resistance R is connected to an AC source of EMF with instantaneous value V, which is given by
V= V₀Sinωt Or (E= E₀Sinωt)
Comparing I₀= V₀/R with Ohm’s law, we find that registers work equally well for both AC and DC voltage.
Phase Difference: Phase angle of V- Phase angle of I
Therefore, Current is in same phase with potential.