Page 34 - The Basics IA by ETron Circuit Labs

ETron Circuit LabsLab 17 Automatic Night LightObjective:In this Lab you will build a Automatic Night Light circuit that will get brighter at night and dimmer during the day.Step 1 – Take InventoryUsing the Parts Inventory as shown on the right under the “Here’s What You’ll Need” section, place each part needed for this experiment on its corresponding drawing. Observe the schematic symbol for each part. Make sure that you have all the parts ready before you begin Step 2.Step 2 – Build the CircuitUsing the Schematic Diagram and the picture of the completed lab, build the lab experiment with the electronic components. Use the “Check Your Work Here” Box to verify that your wiring is correct, and then proceed to Step 3.Step 3 – Do Experiment Theory:The photocell is in parallel with the base/emitter circuit of the transistor. Because the photocell and transistor act like two resistors in parallel, the amount of current through the transistor depends on the resistance of the photocell. The higher the resistance in the photocell, the greater the current through the transistor.32