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** Set up a voltage divider with the photoresistor and a 10K resistor. You can take your circuit from before and replace the potentiometer with the photoresistor. What range of output voltages can you get by covering or uncovering the photoelement?
[[Image:Photoresistor_v_out.png| 200px]]
* Get out your transistor. It should say "TIP 120" on the front of it.
[[Image:Transistor_EBC.png | 200px]] [[Image:Tip120_pins.png| 200px]] [[Image:Tip120-TO-220-3.jpg | 200px]]
* Connect a transistor to control the brightness of a bulb by turning the knob of a potentiometer.
[[Image:Pot_transistor_bulb_driver.png]]