EM7.1 Medium Time Constant RC Circuit
A simple demonstration in which a 1 mF capacitor is charged through a 15k - Ohm resistor (RC = 15 seconds). The time constant is sufficiently long to easily demonstrate, using only a stopwatch and a voltmeter, that the Voltage across the capacitor has increased to factor of (1-1/e) [63%] times the battery voltage in 15 seconds. No external power supply needed - battery included.
EM7.2 Short Time Constant RC Circuit
An RC series circuit with a 3 millisecond time constant. By applying a square wave voltage across the circuit using a function generator and attaching an oscilloscope across the capacitor, you can clearly see the capacitor rapidly charging and discharging on a short timescale. By adjusting the frequency of the square wave input, students can see some interesting transient patterns.
EM7.3 Long Time Constant RC Circuit
This PASCO components box allows you to toggle between various vales of R and C in series. The available time constants range from 24 to 188 seconds. Use with a stopwatch, external power supply and voltmeter, or use a PASCO computerized voltage sensor and supply.
EM7.4 RLC Circuit Board
RLC Circuit Board - Use with signal generator and oscilloscope (shelves C1-1 and C1-2). This circuit board offers components for demonstrating: Voltage/Current Phase Relationships, RLC Resonance, and Non-ohmic characteristics. Includes resistors, capacitors and an inductor coil. Recommended application - use with laptop and datastudio file "RLC_demo.ds". With this file and the PASCO 750 Interface, you can input a sinusoidal signal of any frequency, and visualize the voltage across R, L and C simultaneously (different colors on the digital oscilloscope). Investigate phase relationships and resonance.