#  AC Circuits 

 



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### RC Time Constant

\[L | t+ | ★★★\]  
Charging and discharging of a 10µF capacitor with variable time constant.  
\[[In-Depth Description](/presentations/rc-time-constant)\]

### RL Time Constant

\[L | t+ | ★★★\]  
Pre-assembled circuit board; displays RL time constant on CRO.  
\[[In-Depth Description](/presentations/rl-time-constant)\]

### LC Piano

\[L | t | —\]  
An "electric" piano; tunes are played by changing L.  
\[[In-Depth Description](/presentations/lc-piano)\]

### OHP RLC Circuit

\[S | t | ★★\]  
KiloHenries and microFarads allow one to see the current slosh back and forth in this circuit.  
\[[In-Depth Description](/presentations/ohp-rlc-circuit)\]

### Driven RLC Circuit

\[M | t+ | ★★★\]  
Response of the elements of a series RLC circuit as a function of frequency is observed on a digital oscilloscope.  
\[[In-Depth Description](/presentations/driven-rlc-circuit)\]

### RLC Tunable Circuit

\[M | t | —\]  
Energized by 60 Hz line voltage, this circuit can be tuned with a movable iron core in the inductor; the R is a light bulb.

### RLC Bridge Circuit

\[M | t+ | —\]  
An LC bridge circuit with light bulbs providing the R's; the bridge is balanced visually as indicated by light bulb brightness.

### Induction Balance

\[M | t+ | ★★\]   
Oppositely wound coils produce oppositely induced currents making for a sensitive metal detector

### Audio Filters

\[S | t | ★★★\]  
Simple RL and RC circuits serve as high-pass and low-pass audio frequency filters  
\[[In-Depth Description](/presentations/audio-filters)\]

### AC/DC Power

\[M | t++ | —\]  
When a DC voltage is equal to the rms value of a sinusoidal voltage, the powers supplied to separate light bulbs are equal.

### Tesla Coil

\[M | t | —\]  
Extremely high voltages are generated by the application of a resonant circuit and tuned antenna.

### Dust Particle Paul Trap

\[S | t+ | —\]  
An electrically charged dust particle is trapped in a time-varying (60 Hz) quadrupole electric field.

### Contact Us

**Mailing Address**: Lecture Demonstration Services, Science Center, Rm B-08A, 1 Oxford Street, Cambridge, MA 02138  
**Campus Location**: Science Center B-08A | **Tel**: (617) 495-5824 | **Email**: scidemos-at-fas.harvard.edu