Question

in a circuit the voltage and current are given by v=(10+j5) and i=(6+j4).the power in the circuit is?​

Answer 1

Power of the circuit is 80 Watt.

Explanation:

Using the conjugate method:

P(VA) = (10 + j5)(6 + j4)

P(VA) = 60 + 40j + 30 j + 20

P(VA) = 80 + 70 j

• The real power is 80 Watt and the reactive power of VAR is 70.
• The second term in the above expression is positive.
• The reactive volt ampere of 70 are inductive.

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when a 4V battery is connected across an unknown resistor there is a current of 100 mA in the circuit . The value of the resistance of the resist is : a] 4  ohm. b. 40 ohm. c.400 ohm. d. 0.4 ohm ​ ?

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Answer 2

Answer:

P= 80 watts Q= -10 VAr

Explanation:

S=VI*

S=(P+jQ)

S=(10+j5) (6+j4)*

S=(10+j5)(6-j4)

S= 60+j30-j40+20

S=(80-j10) VA