Elenco LIGHT - Manual (Page 74)

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Project 161 Current Controllers -
Series
Project 162 Current Controllers -
Parallel
Turn on either or both switches (S1 & S2) and
compare the white LED (D6) brightness.
This circuit has the 100 Ω resistor (R1), the 5.1k Ω
resistor (R3), and the 100k
Ω
resistor (R5)
arranged in series. The switches are used to
bypass the larger resistors. The largest resistor
controls the brightness in this arrangement.
Turn on either or both switches (S1 & S2) and compare the white LED
(D6) brightness.
This circuit has the 100 Ω resistor (R1), the 5.1k Ω resistor (R3), and the
100k
Ω
resistor (R5) arranged in parallel. The switches are used to
disconnect the smaller resistors. The smallest resistor controls the
brightness in this arrangement.
Resistors are used to control the
amount of current through a
circuit. Increasing the resistance
decreases the current.