Why is it that a man sitting in an insul...

Why is it that a man sitting in an insulated metal cage does not receive a shock when it is connected to a high voltage supply?

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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 (i) What are the devices X and Y ? (ii) When X and Y are connected in serices across the same source, what will be the current ?

The ratio of energy stored by the series combination of two idential capacitors to their parallel combination , when connected to same supply voltage, is

The table below shows the current in three different electrical appliances when connected to the 240V mains supply: {:("Appliance","Current"),("Kettle",8.5A),("Lamp",0.4A),("Toaster",4.8A):} (a) Which appliance has the greatest electrical resistance? How does the data show this? (b) The lamp is connected to the mains supply by using a thin, twin-cored cable consisting of live and neutral wires. State two reasons why this cable should not be used for connecting the kettle to the mains supply. (c) Calculate the power rating of the kettle when if is operated from teh 240V mains supply. (d) A man takes the kettle abroad where the mains supply is 120V. What is the current in the kettle when it is operated from the 120 supply?

(a) In a series LCR circuit connected across an AC source of variable frequency, obtain the expression for its impedance and draw a plot showing its variation with frequency of the AC source. (b) What is the phase difference between the voltages across inductor and the capacitor at resonance in the LCR circuit ? (c ) When and inductor is connected to a 200 V DC voltage, a current of 1Aflows trough it. when the same inductor is connected to a 200 V, 50 Hz AC source, only 0.5 A current flows. Explain, why ? Also, calculate the self inductance of the inductor.

A pure resistive circuit element X when connected to an sinusoidal AC supply peak voltage 200 V gives a peak current of 5A which is in phase with the voltage. A second circuit element Y , when connected to the same AC supply also gives the same value of peak currrent but the current lags behind by 90^(0) . If the series combination of X and Y is connected to the same supply. the rms value of current is

Between the plates of a parallel-plate capacitor there is a metallic plate whose thickness takes up eta=0.60 of the capacitor gap. When that plate is absent the capacitor has a capacity C=20nF . The capacitor is connected to a constant voltage source. V = 1 00V . The metallic plate is slowly extracted from the gap. Find the mechanical work performed in the process of plate extraction.

Between the plates of a parallel-plate capacitor there is a metallic plate whose thickness takes up eta = 0.60 of the capacitor gap. When that plate is absent the capacitor has a capacity C = 20 nF . The capacitor is connected to a dc voltage source V = 100 V . The metallic plate is slowly extraced from the gap. Find : (a) the energy increment of the capacitor, (b) the mechanical work performed in the process of plate extraction.

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