What is the relationship between current and voltage in a circuit consisting of a capacitor in series with the resistor?
In a circuit consists of a resistor and a capacitor, the current lead the voltage by an angle less than 90° and it is leading.
What is relation between current and voltage for capacitor and inductor?
When the independent source is a current source, the current source current is equal to the current in the capacitor or inductor. Similarly, when the independent source is a voltage source, the voltage source voltage is equal to the voltage across the capacitor or inductor.
What is the relationship between capacitance and voltage?
Capacitor Charge, Plate Separation, and Voltage Also, the more capacitance the capacitor possesses, the more charge will be forced in by a given voltage. This relation is described by the formula q=CV, where q is the charge stored, C is the capacitance, and V is the voltage applied.
What is the current and voltage relationship in RC series circuit?
In a series RC circuit connected to an AC voltage source, the currents in the resistor and capacitor are equal and in phase. In a series RC circuit connected to an AC voltage source, the total voltage should be equal to the sum of voltages on the resistor and capacitor.
What is the relationship between capacitive reactance and capacitance?
It can also be said that if the frequency or capacitance is increased, the opposition to current flow decreases; therefore, capacitive reactance, which is the opposition to current flow, is inversely proportional to frequency and capacitance.
What happens to the capacitor when the capacitor voltage is equal to the source voltage?
What happens to the capacitor when the capacitor voltage is equal to the source voltage? Explanation: When the capacitor voltage is equal to the source voltage, it means that all the charges have moved from one plate of the capacitor to the other. Hence the capacitor is fully charged and we say it gets switched off.
What determines capacitor voltage?
As the charge, ( Q ) is equal and constant, the voltage drop across the capacitor is determined by the value of the capacitor only as V = Q ÷ C. A small capacitance value will result in a larger voltage while a large value of capacitance will result in a smaller voltage drop.
Why does capacitance decrease with voltage?
The presence of the dielectric between the plates of the capacitor reduces the electric field between the plates this in turn decreases the voltage. If there is an increase in the voltage the capacitance will be less since voltage and capacitance are inversely proportional.
What is capacitive reactance?
The opposition to the flow of alternating current due to capacitance is called “capacitive reactance.” It is measured in ohms just like resistance and inductive reactance. In capacitors, the current leads voltage by 90 degrees.
Why capacitive reactance is inversely proportional to frequency?
Capacitive reactance of a capacitor decreases as the frequency across its plates increases. Therefore, capacitive reactance is inversely proportional to frequency. Also as the frequency increases the current flowing into the capacitor increases in value because the rate of voltage change across its plates increases.