Elenco Snaptricity&reg - Manual (Page 38)

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Educational Corner:
Triple Switching Ammeter Project #28
1A
Electric Paths
Most electronic products have
almost all of their components and
wires mounted on special boards. In
these boards, the “wires” connecting parts are literally “printed” on the
surface of the board; hence the
boards all are called “printed circuit
boards” or PCBs.
1A
Operation
This is an example of how current decreases as parts are added in series.
When the slide switches are in position C, no current flows
through the bypassed lamp because the switch has very low
resistance.
Description
Build the circuit and set the meter (M5) on the 1A setting.
Assembly
Set the slide switches (S5) to position C. Push the press switch
(S2); the meter measures the current through the right lamp.
The slide switches control the left two lamps (L4), individually. If the
lamps are on (switch position B), the battery voltage is split among
them and less current will be measured through the lamps.
Note: Your M5 meter is a simple meter. It may read zero on this scale even
though a small current is flowing.
Snappy says: switches come in many diverse forms. Try to count how
many are in your home or car; you will be amazed. There are slide,
press, membrane, rotary, push-button, and other switches controlling
nearly everything.