RLC circuit
related java applet: rlc series DC circuit

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This java applet will show you physics properties of an R-L-C circuit.

driven by a harmonic voltage source¡C

¡]A new window will popup when you click the start button)

and the resistor is 1.0 k£[.

1. The period of the AC source (enter into the textField)

Its unit can be ¡G s , ms (10-³s), us(10-⁶s), ns(10-⁹s)
2. You can change the inductance¡G
Click the mouse within the inductance regin (blue coils)
Click left button to decrease its value.

Click right button to increase its value.

The increasement is determined by delta* choicebox
3. You can change the capacitance with the same method.

4. Press Start for animation

 

Red Curve	Yellow Curve	blue curve	green curve
V	VR	VL	VC

5. White small circle simulate the AC current,
its velocity is propotional to current I.
6. If the mouse button is within the curve (time-voltage) region,
The coordinate of the mouse will be translated and displayed.

Click near (time, voltage)=(0.s, 10.0v) and

drag the mouse up and down to change y scaling factor.
7. Press mouse button to suspend the animation.
If you click the left mouse button,
animation resume when you release the mouse button.
If you click the right mouse button,
you need to click it again.
8. Press Reset button to reset parameters.

9. Press Quit or Close the window to Quit.

Observation¡G

1. Phase between VC(Voltage of capacitor) and VL(Inductor)

2. phase between VR(Resistor) and VL or VC.

3. Relation between VL and oscillator frequency f= 1/T(period).

How to increase VL ?
4. Relation between VC and oscillator frequency
How to increase VC ?
5. VR is propotional to I (current).
How to increase the current?

What is the relation between VL and Vc when I is maximum ?

6. V = VR + VL + VC
In the above picture, VL(blue) > V(red) ??? Why ???

Your suggestions are highly appreciated! Please click hwang@phy03.phy.ntnu.edu.tw

Author¡GFu-Kwun Hwang, Dept. of physics, National Taiwan Normal University