What to expect if a resistor is placed in a dc circuit with a capacitor?
when we replace the resistor with a capacitor ,the current will flow until the capacitor charge when capacitor will fully charged there is no current through the circuit because now capacitor will act like an open circuit.
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If a 0.001 and a 0.015 capacitor are placed in parallel. what would be the total capacitance of the circuit?
This capacitor carries a current of 25,000/690 or 36.2 amps and its impedance (reactance) is 19 ohms. The capacitance is 1/(2.pi.50.19) or 0.000167 Farad, on a 50 Hz system. The time-constant is CR so that if a 20,000 ohm resistor is placed across the capacitor the time-constant is 3.3 seconds. The voltage is reduced by 99% after 5 time-constants or in this case 17 seconds. If the discharge resistor is permanently in circuit it dissipates…
A capacitor or group of capacitors which are placed across an Electric Power line or Electric Appliance to provide a voltage increase or to improve the power factor of the circuit. A switchable shunt may be disconnected from the circuit when conditions warrant, while a fixed shunt is permanently connected to the power line.
Operational amplifiers are used in many applications where a well defined transfer function is needed. In former times they were widely used in analogue computers and simulators. The ideal op-amp is a phase-inverting voltage amplifier with infinite input impedance, zero output impedance and a very high voltage gain. Practical op-amps like the 741 achieve this very well. The simplest op-amp circuit is a voltage amplifier with a resistor between the input and output terminals, and…