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An electrical device draws 2kW power from AC mains (voltage223V (rms) = `sqrt50,000` V).The current differs (lags) in phase by `φ tan φ=-3/4` as compared to voltage. Find `X_C –

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An electrical device draws 2kW power from AC mains (voltage223V (rms) = `sqrt50,000` V).The current differs (lags) in phase by `φ tan φ=-3/4` as compared to voltage. Find I M. Another device has twice the values for R, XC and XL. How are the answers

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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1MW power is to be delivered from a power station to a town 10 km away. One uses a pair of Cu wires of radius 0.5 cm for this purpose. Calculate the fraction of ohmic losses to power transmitted if power is transmitted at 220V. Comment on the feasibility

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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1MW power is to be delivered from a power station to a town 10 km away. One uses a pair of Cu wires of radius 0.5 cm for this purpose. Calculate the fraction of ohmic losses to power transmitted if a step-up transformer is used to boost the voltage

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Consider the LCR circuit shown in Fig . Find the net current i and the phase of i. Show that ` I=Z/V` . Find the impedence Z for this

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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For an LCR circuit driven at frequency ω, the equation reads`L (dl)/(dt)+Ri+q/c= V_i= V_m sinωt` Multiply the equation by i and simplify where

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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For an LCR circuit driven at frequency ω, the equation reads`L (dl)/(dt)+Ri+q/c= V_i= V_m sinωt` Interpret each term

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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For an LCR circuit driven at frequency ω, the equation reads`L (dl)/(dt)+Ri+q/c= V_i= V_m sinωt` Cast the equation in the form of a conservation of energy

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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For an LCR circuit driven at frequency ω, the equation reads`L (dl)/(dt)+Ri+q/c= V_i= V_m sinωt` Intergrate the equation over one cycle to find that the phase difference between V and i must be

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In the LCR circuit shown in Fig , the ac driving voltage is `v = V_m sin ωt`. Write down the equation of motion for q

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In the LCR circuit shown in Fig , the ac driving voltage is `v = V_m sin ωt`. At t = t0, the voltage source stops and R is short circuited. Now write down how much energy is stored in each of L and

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In the LCR circuit shown in Fig , the ac driving voltage is `v = V_m sin ωt`. Describe subsequent motion of

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Explain why A.C. is more dangerous than D.C.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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If a direct current of value a ampere is superimposed on an alternating current `I = b sinomegat` flowing through a wire, what is the effective value of the resulting current in the circuit

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Show that average heat produced during a cycle of AC is same as produced by DC with `I =

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A 50 W, 100 V lamp is to be connected to an AC mains of 200 V, 50 Hz. What capacitance is essential to be put in series with the lamp

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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When an alternating voltage of 220V is applied across a device X, a current of 0.5 A flows through thecircuit and is in phase with the applied voltage. When the same voltage is applied across another deviceY, the same current again flows through the circuit but it leads the applied voltage by `pi'/'2` radians.(a) Name the devices `X and Y.`(b) Calculate the current flowing in the circuit when same voltage is applied across the seriescombination of `X and

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Find out reading of A C ammeter and also calculate the potential difference across, resistance and

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In LCR circuit with an AC source `R = 300Omega, C = 20 muF, L = 1.0 H, E_('rms')=50V and f = 50'/'piHz`. Find RMS current in the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In a L–C circuit parallel combination of inductance of 0.01 H and a capacitor of `1muF` is connected to a variable frequency alternating current source as shown in figure. Draw a rough sketch of the current variation as the frequency is changed from 1kHz to

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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