Elenco Deluxe Snap Rover&reg - Manual (Page 21)

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Project #16 Ways to Light a Light
Project #15
OBJECTIVE: To learn about resistors.
Resistor Row
Build the circuit and
connect the jumper
wires as shown. Push
the press switch (S2) to
turn on the white LED
(D4), and use the slide
switches (S1) to vary
the brightness.
If you replace one of
the resistors with the
much larger 100K
resistor (R5), the white
LED may not light at all.
+
OBJECTIVE: To learn about resistors.
R
O
VER REAR
When the slide switches are
off the larger resistors (R2
and R4) are connected in a
series, limiting the flow of
electricity to the white LED.
Turning on the slide switches
bypasses the larger resistors
and the LED gets brighter.
Connecting resistors in a
series increases the
resistance.
Build the circuit and
connect the jumper
wires as shown. Push
the press switch (S2) to
turn on the white LED
(D4), and use the slide
switches (S1) to vary
the brightness.
If you replace one of
the resistors with the
much larger 100K
resistor (R5), it will be
almost the same as
leaving that one out of
the circuit.
When the slide switches are on
the smaller resistors (R1 and
R2) are connected in parallel
with the larger one (R4),
increasing the flow of electricity
to the white LED. Turning on the
slide switches provides alternate
paths around the largest resistor
and the LED gets brighter.
Connecting resistors in parallel
decreases the resistance.
+
R
O
VER REAR