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A device ‘X’ is connected to an a.c source. The variation of voltage, current and power in one complete cycle is shown in Fig . Which curve shows power consumption over a full

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

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A device ‘X’ is connected to an a.c source. The variation of voltage, current and power in one complete cycle is shown in Fig . What is the average power consumption over a

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

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A device ‘X’ is connected to an a.c source. The variation of voltage, current and power in one complete cycle is shown in Fig . Identify the

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

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Both alternating current and direct current are measured in amperes. But how is the ampere defined for an alternating

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

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A coil of 0.01 henry inductance and 1 ohm resistance is connected to 200 volt, 50 Hz ac supply. Find the impedance of the circuit and time lag between max. alternating voltage and

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

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A 60 W load is connected to the secondary of a transformer whose primary draws line voltage. If a current of 0.54 A flows in theload, what is the current in the primary coil? Comment on the type of transformer being

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

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Explain why the reactance provided by a capacitor to an alternating current decreases with increasing

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

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Explain why the reactance offered by an inductor increases with increasing frequency of an alternating

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

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 `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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