Materials
photo of breadboard
A breadboard is used to prototype electric circuits. Components placed can be added to, removed from, or rearranged on the breadboard easily.
Photoresistors are light-sensitive resistors. Their resistance decreases as ambient light intensity increases.
LEDs are semiconductor light sources. LEDs are polarized which mean they have two leads. The longer lead is the anode (+) and the shorter lead is the cathode (-). An LED must be connected to a resistor in order to protect the LED from overheating.