# How long will it take to fully charge a capacitor in a series RC ciRCuit with a 6microfarad capacitor 2Kilohm resistor and 141 volt supply?

The time it takes to fully charge a capacitor depends on the capacitance and resistance of the circuit; the voltage is irrelevant. The equation you need is:

*t* = 5*RC*

where: **t** =**time** in seconds, **R**
=**resistance** in ohms, and **C** =**capacitance** in farads.

So you should now be able to calculate the time for yourself, but remember to convert the resistance into ohms and the capacitance into farads before you insert the figures into the equation.

### Why capacitor reduce gain of ce amplifier?

Where is this capacitor in the circuit? A capacitor across the emitter bias resistor actually increases the AC gain because it bypasses that resistor, by increasing the ratio of collector impedance to emitter impedance which determines the amplifier voltage gain. A capacitor across the base input resistor actually increases the AC gain because it bypasses that resistor, by decreasing the attenuation of the input signal by the input circuit network.

### What happens to the current in a circuit as a capacitor charges?

What happens to the current in a circuit as a capacitor charges depends on the circuit. As a capacitor charges, the voltage drop across it increases. In a typical circuit with a constant voltage source and a resistor charging the capacitor, then the current in the circuit will decrease logarithmically over time as the capacitor charges, with the end result that the current is zero, and the voltage across the capacitor is the same as…

### Why would the gain go up in a circuit board when you put an emitter capacitor in the circuit?

The emitter resistor is there to provide DC bias to the base. If it is not bypassed, then the AC output signal is also dropped across this resistor, effectively lowering the output swing. When a bypass capacitor is added, the DC bias still flows through the resistor, but the capacitor acts as a short circuit for the AC signal, so that the AC signal is not reduced. The capacitor selected must be large enough so…

### What is the use of resistors in a circuit?

One use is as a current limiter. For example if a certain device (like a capacitor) is capable of being in conditions similar to a short circuit, the amount of current "drawn" by the capacitor could be damaging to it or other components. Placing a resistor in series with the capacitor means that you can select the proper resistor so that at maximum capable volt, you know the maximum current that will flow through that…

### What is the function of a capacitor and resistor in a bridge rectifier circuit?

The capacitor follows the rectifier to smooth the DC output. It has a safety resistor in parallel to discharge it safely when it is turned off. The resistor value can be chosen produce a given time-constant, e.g. a 1000 uf capacitor might have a 3k3 resistor across, which gives a 3.3 second time-constant. The capacitor is then discharged to 1% voltage in 5 time-constants, 16.5 seconds in this case.

### A series RC circuit will have a phase shift between 0 and 90 degrees?

If there are only a resistor and a capacitor in the circuit, then the phase shift will indeed be between 0 and 90 degrees. When the resistor and capacitor are in series, the phase shift will be negative when the capacitor is connected to a source voltage and the resistor is the load. The phase shift will be positive when the resistor is connected to the source. The lower the values of R and C…

### How does an RC oscillator work?

The resistor allows a slow charge to enter the capacitor. When this charge reaches a certain point the circuit activates and forces the capacitor to discharge. Once discharged the circuit reverses itself and starts the charge over again. The larger the cap and/or resistor the lower the frequency because it takes longer to charge the cap.

### How do 555 timers work?

A resistor is connected between a voltage source and a capacitor, charging the capacitor slowly over a time. The actual time depends on the resistance value of the resistor and the capacitance value of the capacitor. Together they produce something that is described as their "time constant value". The 555 measures the capacitor voltage as it increases and compares it to a threshold to trigger things at certain time intervals, and also 555 has a…

### How many time constants does it take to fully charge a capacitor?

If a resistor is connected in series with the capacitor forming an RC circuit, the capacitor will charge up gradually through the resistor until the voltage across the capacitor reaches that of the supply voltage. The time called the transient response, required for this to occur is equivalent to about 5 time constantsor 5T . This transient response time T , is measured in terms of Ï„= R x C , in seconds, where R…

### Can a capacitor act as a timer?

A capacitor and a resistor can control a timing circuit. Multiplying the capacitance (Farads) by the resistance (Ohms) gives a quantity called the Time Constant in seconds. So a 1 uF capacitor and a 1k resistor create a time constant of 1E-6 x 1E3 which is 1 millisecond. A common use of a timing circuit is a monostable multivibrator, which produces a pulse with a well defined length. The length of the pulse depends on…

### What is brownout reset?

Brownout reset is a circuit that forces the microprocessor to reset if there is a short interruption of power - one that is long enough to disrupt operation, but not long enough to force a normal power on reset. It is usually a diode, resistor, and capacitor. The diode discharges the capacitor quickly when Vcc goes away, and the resistor charges the capacitor slower when Vcc comes back.

### Circuit diagram for fixed bias circuit?

need to use BC107 transistor which has three terminals base, collector and emitter........ collector is connected with 6.8k ohm resistor other end of this resistor is connected with 3.7 ohm resistor and it is connected to the base of the transistor which is already connected to a capacitor of 1 micro F and a positive of function generator......and in the output side i.e in the collector and emitter side connect the 1 micro F capacitor…

### How does ohm's law works in a resistor circuit?

Ohm's law states that voltage is resistance times current. In a resistor circuit, knowing two of voltage, current, or resistance, you can calculate the third. Actually, this applies to any circuit, be it resistor, capacitor, or inductor. Ohm's law still applies - it just gets more complex when the phase angle of current is not the same as the phase angle of voltage.

### Why don't capacitor discharge completely in an RC circuit?

Capacitors do not get "full" like a glass of water. The current into a capacitor is the rate of change of charge, so it's equal to C * dV/dt or something. If the voltage is constant, there's no current. If the voltage on both sides of the resistor is the same, there's no current through the resistor and hence into the capacitor, so that's the steady-state - what you call "full" - the capacitor charged…

### Why was the capacitor discharging current negative?

When a capacitor is discharging, current is flowing out of the capacitor to other elements in the circuit, similar to a battery. Current flowing out of an element, by convention, is defined as negative current, while current flowing into an element, such as a resistor, is defined as positive current. Thus a discharging capacitor will always have a negative current.

### Why resistor and capacitor and inductor are passive components?

All are considered passive because they cannot amplify a signal. Of the three, the resistor is the passive component. Both the capacitor and inductor are reactive components. Capacitors store energy through electrostatics. Inductors store energy through electromagnets. Voltage lags current by 90 degrees in a capacitive circuit. Current lags voltage by 90 degrees in an inductive circuit.