CBSE Class 12-science Physics Power in AC Circuit

• The value of instantaneous voltage received from a.c. source is given by following equation, V = 200-?2 sin 314t volt, then find the root mean square value of the source?
• A motor drill draws 3.5 A current at the power line voltage 120 V(RMS). What is the motor's power if the current lags the voltage by 20 degrees?
• A series LCR circuit with a 100 ohm resistor dissipates 80 W when attached to a 120 V, 60 Hz power line. What is the power factor?
• The required no-load ratio in a 1 -phase 50 Hz core type transformer is 6000/250 V. Find the no. of turns in each winding if the flux is to be about 0.06 wbs.
• a horizontal straight wire 10m long extending from east to west is falling with a speed of 5m/s at right angles to the horizontal component of the earth magnetic field 0.30  
• Prove that an ideal inductor does not dissipate power in an A.C circuit.
• The power factor varies between………………
• What will be the phase difference between the voltage and the current given power factor of an ac circuit is 0.5?
• The voltage and current in an ac circuit is given by What is the power dissipated?
• On what factors does power in an ac circuit depend?

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