Elenco Green Projects - Manual (Page 32)

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5V
Moving Voltage Project #36
Build the circuit and set the meter (M6) to
the 5V setting. Place the wind fan on the
motor (M4). Set the slide switch (S5) to
position B. The red LED (D1) lights, the fan
spins, and the meter shows the voltage
across the motor. You may need to give the
fan a push to get it started. The voltage
produced by the battery is split between
the motor and the LED.
Push the press switch (S2). The LED turns
off, the motor speeds up, and the meter
shows a higher voltage across the motor.
With the press switch on, the full voltage
from the battery is available at the motor
because the LED is bypassed.
Build the circuit and set the meter
(M6) to the 5V setting. Push the
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.
Part B
5V
Switches are
used to move
voltage around
a circuit.
Project #37 Moving More Voltage
Part C
+
The horn voltage plus the LED voltage should about equal 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 when it is pressed.
See projects 1 & 3 if you need to recharge the battery (B4).