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A step down transformer is connected to main supply 200 V to operate a 6V, 30 w bulb. The current in primary

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An emf of 15 V is applied in a circuit containing 5H inductance & `10 Omega` resistance. The ratio of the currents at time `t=oo` and at t =

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Two coils have a mutual inductance 0.005H The current changes in a coil according to equation `I = I_O sinomegat` Where `I_O = 10 A & ω= 100 π rad s^(-1)` The maximum value of emf in second coil

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A coil of inductance 8.4 mH and resistance `6Omega` is connected to a 12 V battery. The current in the coil is 1A in the

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Alternating current can not be measured by dc ammeter

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The resistance of a coil for dc is in ohms. In ac, the

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An alternating current of rms valuve 10 A is passed through a `12_Omega` resistance. The maximum potential difference across the resistor

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220 V,50 Hz, ac is applied to a resistor. The instantancous value of voltage

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The rms value of an ac of 50 Hz is 10 amp.The time taken by the alternating current in reaching from zero to maximum value and the peak value of current will

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If a current I given by `I_O sin(omegat-pi/ 2)` flows in an ac circuit across which an ac potential of `E = E_O sinomegat` has been applied, then the power consumption p in the circuit will

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In general in an alternating current

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An alternating current is given by the `eq^n` I = I1 coswt + I2 sinwb. The rms current is given

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In an ac circuit, the current is given by `I= 5sin[ 100 t -pi/2]` and the ac potential is `V = 200 sin 100t`. Then the power consumption

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In ac circuit with voltage V and current I, the power dissipaled

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In the transmission of a.c. power through transmission lines, when the voltage is shapped up n times, the power loss in

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An alternating voltage is represented as `E = 20 sin 300t`. The average value of voltage over one cycle will

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An ac source is rated at 220V, 50 Hz. The time taken for voltage to change from its peak value to zero

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A lamp consumes only 50% of peak power in an ac circuit. What is the phase difference between the applied voltage and the circuit

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The instantancous voltage through a device of impedance `20Omega` is `ε= 80 sin100π t ` . The effective value of the current

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A choke coil

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