Let us rephrase our pemhamanan of capacitors. Capacitors are passive circuit elements which can save energy. Capacitors are made of two parallel conductive plates that have a large A (m2) and within each other by d (m). With such a relationship then when it gets capacitor electric current will generate a voltage in kapasitronya, where a large value capacitor voltage is:
Where C is a constant whose value depends on the area and distance plate plate and insulation material that exists between the two plates. Mathematically be written as follows:
Where :
C is called capacitance measured in Farad
ε is the permittivity of the dielectric material.
For air permitifitasnya value is
ε = ε 0 = 8854 pF / m.
Observe the following image. A capacitor is connected to a voltage source of direct current through resistor R and is controlled by a switch S as shown below. Up here you will want to know what happens when electric current is connected to a capacitor. If you make the RC circuit as shown below, notice what happens to the current in the circuit and the voltage on the capacitor?
3:41 Picture Series RC circuit
Concept
If the direct current source is connected to a capacitor, charges from the source is supplied to the capacitor. As a result, the plates in the capacitor, previously neutral, forming different polarity. Through resistor R are coupled in series with the capacitor, charging obstacles. Therefore, in addition to relying on the voltage source, charging is also dependent on the time. The series of images shows the experimental series circuit connected to a DC source.
Potential relationship when the capacitor is charged as follows:
by Vo, VR, and potential sources of VC states, potential barriers and potential on the capacitor, q is the charge which charges the capacitor, i is the current through the circuit and C is the large capacity of the capacitor. By using equation (2) and (3), equation (1) can be completed to determine the potential capacitor while charging:
If the source is removed and linked brief RC circuit (as in the picture above), the capacitor will release its payload. Padakondisi potential link is:
Equation (5) can be resolved into:
VC stated potential capacitor discharge current and potential capacitor VCO is first.
The series of experiments image
Calculating the time constant RC circuit with a voltmeter.
1. Arrange the circuit as shown series of experiments, the switch face-first on the condition 1. Set the source voltage of 10 volts. Note the polarity of the capacitor.
2. Move the switch to position 2 and note VC every 40 seconds as many as 15 data.
3. Move the switch to condition 1, and note VC every 40 seconds as many as 15 data.
4. Repeat for the price of R and C to another.