Alternating Current
Jammu & Kashmir Board · Class 12 · Physics
All formulas from Alternating Current in Jammu & Kashmir Board Class 12 Physics. Key equations, constants, and identities for board exam preparation.
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2. AC Voltage and Current in a Resistor
v = v_m sin ωt
i = i_m sin ωt
i_m = v_m / R
I = i_m/√2 = 0.707 i_m
V = v_m/√2 = 0.707 v_m
3. Pure Inductor in AC
i = i_m sin(ωt - π/2)
X_L = ωL
i_m = v_m / X_L
Average power over a cycle = 0
4. Pure Capacitor in AC
i = i_m sin(ωt + π/2)
X_C = 1/ωC
i_m = v_m / X_C
Average power over a cycle = 0
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