al = R 1 + R 2 + ... + R n Parallel Resistance: 1 / R total = 1 / R 1 + 1 / R 2 + ... + 1 / R n 2. Power and Energy Power (DC): P = VI Power (AC): P = V rms I rms cos φ Reactive Power: Q = V rms I rms sin φ Apparent Power: S = V rms I rms Energy: E = P
and current in phase: V = I × Z Power factor: PF = cos(θ) = R / |Z| Power in AC Circuits Power calculations extend into complex power due to phase differences. Complex Power S = V × I Where I is the complex conjugate of current S = P + jQ Re
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