Honk Your Horn

Project Number: 20

Description: Build the circuit, and set the meter (M6) to the 50mA setting. Push the switch (S2) to "honk" the horn (W1), while the meter measures the current through it. Compare the current with the horn to the current using the LEDs and resistors in projects 18 and 19.

Snappy: The horn converts electricity into sound energy by making mechanical vibrations. These vibrations create variations in air pressure, which travel across the room. You "hear" sound when your ears feel these air pressure vibrations.