In an a.c. circuit the peak voltage of supply is 300 V. What is rms voltage? What is mean voltage during a positive half-cycle and for a complete cycle?
212 V, 191 V
The rms voltage is given by
The mean voltage during half-cycle is given by
The mean voltage for a complete cycle is zero.
Resonance frequency of a circuit is f if the capacitance is made 4 times the initial value , then the resonance frequency will become
In and A.C. circuit , minimum voltage of 423 Volt. Its effective voltage is
The average power dissipation in a pure capacitor in A.C. circuit is
A 100-turn rectangular coil of size 0.20 m × 0.10 m rotates in a magnetic field of 0.003 Wb m–2 with a frequency of 1200 rpm about an axis normal to the field. Find the maximum value of the induced emf.
An a.c. generator consisting of a coil of 100 turns and cross-sectional area of 3 m2 is rotating at a constant angular speed of 60 rad s–1 in a uniform magnetic field of 0.04 T. The resistance of the coil is 500 . Calculate maximum current drawn from the generator, and power dissipation in the coil. From where does the power come?
An a.c. generator consists of a coil of 50 turns and area 2.5 m2 rotating at an angular speed of 60 rad s–1 in a uniform magnetic field of 0.30 T. The resistance of the circuit including that of the coil is 500 . Find the maximum current drawn from the generator.
In a dynamo, a coil of area 0.2 m2 and having 100 turns rotates in a magnetic field of 0.1 Wb m–2 with an angular velocity of 100 rad s–1. The output terminals are connected through a resistance of . Calculate the torque , as a function of time t, required to keep the coil rotating.
The electric main in a house is marked 220V-50Hz. Write down the equation for instantaneous voltage.
A sinusoidal voltage V = 200 sin 314t is applied to a resistor. Find the frequency of the supply.
A resistor is connected to 220 V-50 Hz a.c. supply. Find rms value of current in the circuit and the net power consumed for a complete cycle.