Voltage across the resistor, inductor and capacitor in series LCR circuit are 20 V, 50 V and 50 V respectively. Peak value of the applied source is
1. 20 V
2. 20 V
3. 120 V
4. 120 V
The r.m.s value of current for
1. 5 A
2. 5 A
3.
4.
If and are half power frequencies of a series LCR circuit, then resonant frequency can be expressed as
Voltage and current in an ac circuit are given by \(V=5sin\left ( 100\pi t-\frac{\pi }{6}~ \right )~V\) and \(I=4sin\left ( 100\pi t+\frac{\pi }{6}~ \right )~A.\)
Hence:
1. | The voltage leads the current by 30°. |
2. | The current leads the voltage by 30°. |
3. | The current leads the voltage by 60°. |
4. | The voltage leads the current by 60°. |
The r.m.s. voltage of the waveform shown is:
1. 10 V
2. 6.37 V
3. 7 V
4. 10.5 v
If potential differences measured in ac voltmeters across the inductor, capacitor, and resistor in series LCR ac circuit are 100 V, 100 V, and 50 v respectively, then the peak value of the applied ac voltage to the circuit is
1. 50 V
Voltage and current in an A.C. circuit is given by
Wattful current in the circuit is-
Which of the following devices is not based on Faraday's law of electromagnetic induction?
1. AC generator
2. Speedometer
3. Induction motor
4. DC motor
Current l through an inductor is increasing according to . Variation of the rate of increment of its energy with time t is correctly shown in the graph
1. 2.
3. 4.
A time-varying current is given by Its r.m.s. value is (symbols have usual meanings)