help me in this math question

Posted on 2014-11-15 11:56:00 in Math by FAHAD

1. The voltage and current at the input of a circuit

are given by the expressions

v(t) = 130cos(?t +80°)V and

i(t) = 195cos(?t +130°)A.

Determine the average power absorbed by the circuit.

P = _______ W

 

2. Determine the real power, P, the reactive power,Q,

the complex power, S, and the power factor, p f , for three loads

having the following characteristics.



I = 4.5?285°Arms

V = 5?360°Vrms

P = ________ W

Q = ________ VAR

S = ________ VA

p f = ________

I = 7.5?270°Arms

Z = 5200? - 20°?

P = ________ W

Q = ________ VAR

S = ________ VA

p f =________

V = 8?330°Vrms

Z = 4900?30°?

P = ________ W

Q = ________ VAR

S = ________ VA

p f =________

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