مأخذ متناوب جيبي بين طرفيه توتر لحظي يعطى بالعلاقة:

Ueff = Umax/√2

Ueff = 200√2/√2

Ueff = 200 V

ω = 2π.f

100π = 2π.f

f = 50 Hz

R = 200/4

R = 50 Ω

Z2 = Ueff / Ieff2

Z2 = 200/5

Z2 = 40 Ω

Ieff = Ieff1 + Ieff2

Ieff = Ieff1 + Ieff2 + 2Ieff1.Ieff2.cos(φ2-φ1)

49 = 16 + 25 + 2*4*5*cos(φ2-0)

cosφ2 = 0.2

cosφ2 = r/Z

0.2 = r/40

r = 8 Ω

Pavg1 = Ueff.Ieff1.cosφ1

Pavg1 = 200*4*1

Pavg1 = 800 w

Pavg2 = Ueff.Ieff2.cosφ2

Pavg2 = 200*5*0.2

Pavg2 = 200 w

Pavg = Ueff.Ieff.cosφ1

Pavg1 = 200*4*1

Pavg = Pavg1 + Pavg2

Pavg = 1000 w

Pavg = Ueff.Ieff.cosφ

1000 = 200*7*cosφ

cosφ = 5/7