Moving More Voltage

Project Number: 37

Description: Build the circuit and set the meter (M6) to the 5V setting. Press the press switch (S2); the meter measures the voltage across the horn (W1). Part B: Move the meter so it is across the red LED (D1). Push the switch to measure the voltage across the LED. Part C: Move the meter so it is directly across the battery (B4). Push the switch to measure the voltage produced by the battery.

Snappy: The horn voltage plus the LED voltage should be about equal to the battery voltage. It may be a little different, because the M6 meter has limited accuracy. The voltage across the switch will be very low if it is pressed.