An electrical device draws 2kW power from AC mains `(voltage 223 V rms=sqrt 50,000 V)`.The current differs (lags) in phase by `phi(tan phi=-3/4)` as compared to voltage. Find
R.
Another device has twice the values for R, `X_C` and `X_L`. How are the answers affected?

When an electric device X is connected to a 220 volt, 50 hertz a.c. supply, the current is 0.5 amp, and is in same phase as the applied voltage. When another device Y is connected to the same supply, the electric current is again 0.5amp, but it leads the potential difference by pi//2 . When X and Y are connected in serices across the same source, what will be the current ?

When an inductor L and a resistor R in series are connected across a 12V, 50Hz supply of current of 0.5 A flows in a circuit. The current differs in phase from applied voltage to pi/3 radins calculate the value of R.

When a circuit element X is conneted across a.c. sourceof emf 220sqrt2V , a current sqrt2 A flows through it and this current is in phase with applied voltage. When another element Y is connected across same a.c. source, the same current flows in the circuit, but it leads the voltages by pi//2. Find current that flows in the circuit when series combination of X and Y is connected acorss same a.c. voltage.

When a circuit element X is conneted across a.c. sourceof emf 220sqrt2V , a current sqrt2 A flows through it and this current is in phase with applied voltage. When another element Y is connected across same a.c. source, the same current flows in the circuit, but it leads the voltages by pi//2. Plot a graph showing variation of net impedance of series combination of X and Y as a function of angular frequency of applied voltage.

When a circuit element X is conneted across a.c. sourceof emf 220sqrt2V , a current sqrt2 A flows through it and this current is in phase with applied voltage. When another element Y is connected across same a.c. source, the same current flows in the circuit, but it leads the voltages by pi//2. Name the circuit elements X and Y.

When an inductor L and resistor R in series are connected across a 12 volts 50 Hertz supply a current of 0.5 ampere flows in thecircuit the circuit current differs in phase from applied voltage by pi/3 Calculate the value R.