Advertisements
Advertisements
प्रश्न
Draw the effective equivalent circuit of the circuit shown in figure, at very high frequencies and find the effective impedance.
Advertisements
उत्तर
The element with infinite resistance will be considered as open circuit and the element with zero resistance will be considered as short-circuited.
In similar way, `X_C = 1/(2pivC)`
At high frequency, XC will be low.
So reactance of capacitance can be considered negligible and capacitor can be considered as short-circuited.
Here the above figure is equivalent circuit to given circuit.
Total impedance,Z = R1 + R3
APPEARS IN
संबंधित प्रश्न
What type of current is transmitted from the power station?
State two factors on which the magnitude of induced e.m.f. depend.
For what purpose are the transformers used? Can they be used with a direct current source?
How are the e.m.f in the primary and secondary coils of a transformer related with the number of turns in these coils?
Given the input current 15 A and the input voltage of 100 V for a step-up transformer having 90% efficiency, find the output power and the voltage in the secondary if the output current is 3 A.
State the principle of working of a transformer. Can a transformer be used to step up or step down a d.c. voltage? Justify your answer.
Can a transformer be used with direct current source? Give reason.
A transformer lowers e.m.f. 220 V to 12 volts. If the number of turns in primary are 8800, how many turns are in secondary coil?
An ideal transformer has 100 turns in the primary and 250 turns in the secondary. The peak value of the AC is 28 V. The rms secondary voltage is nearest to ______
In a series resonant RLC circuit, the voltage across 100 Ω resistor is 40 V. The resonant frequency ω is 250 rad/s. If the value of C is 4 µF, then the voltage across L is
A 200V/120V step-down transformer of 90% efficiency is connected to an induction stove of resistance 40 Ω. Find the current drawn by the primary of the transformer.
The 300 turn primary of a transformer has resistance 0.82 Ω and the resistance of its secondary of 1200 turns is 6.2 Ω. Find the voltage across the primary if the power output from the secondary at 1600V is 32 kW. Calculate the power losses in both coils when the transformer efficiency is 80%
Define a Transformer.
A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?
Mention two main sources of power loss in real transformers.
Explain why core of a transformer is always laminated.
A step down transformer connected to an AC mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?
A 12 V, 60 W lamp is connected to 220 V AC via an ideal transformer. Find the primary current.
