Light Sensor application of Electronics Electronics is the part of physics that studies the movement of electrons. Electric Current Movement of electrons is current. So, current is the movement of millions of electrons through a conductor or wire. A Lamp Battery Inside a battery, the terminals are made of different elements- zinc and carbon respectively. They are separated by a chemical that allows electrically charged atoms to move through it. Voltage A battery produces a voltage. The voltage will cause the electrons to flow from the negative terminal to the positive terminal. Electric Current The flow of electrons is called the current. When a bulb is attached to the battery, electrons flow from the negative terminal through the bulb to the positive terminal of the battery. Current Loop All circuits must have the current flow in a complete loop. If you start from one terminal you should be able to trace all the way around the wire and end at that same terminal. Questions to Think About 1. When you connect a lamp or any conductive material across the terminals of a battery, electrons will flow from the ________ to the _______ of the battery. 2. This flow is called the electric __________? Solderless Circuit Board You will be given a solderless circuit board. Notice that there are many tiny holes on each board. Solderless Circuit Board Each hole will accept a wire or lead. All the holes on the very edge go across the board horizontally. All the holes in the center of the board go across vertically. This means that each vertical group is shorted together. Solderless Circuit Board A center channel divides the circuit board in half. This means the numbered rows that are grouped vertically only go on each half. Integrated circuits are meant to straddle this channel. Light Sensor kit Each lab kit talks about a procedure and introduces the theory of the circuit. It gives you an appearance of a new component and its schematic symbol. Lab Kits 1. Your objective for each kit is to read through the purpose and theory- don’t skip this part. 2. Draw the circuit schematic. This will help you become familiar with how to read them. 3. Build the circuit following the steps. Don’t forget to read operating instructions. 4. Write down the results and observations in your own words. Time for sign off with me I’m looking for three things: 1. schematic diagram 2. results of observation 3. I need to see it actually built Your Objective is to Create a Light Sensor from this list of materials. 9V battery Photo Cell Resistor Symbol Part LED Your Objective is to Create a Light Sensor from this list of materials. 9V battery Photo Cell Resistor Symbol Part Parts-> Symbols-> LED Your Objective is to Create a Light Sensor from this list of materials. Photo Cell Resistor Symbol 9V battery LED For a challenge add a switch. Then measure the current with Amp meter. 9V battery Photo Cell LED Amp meter Switch Answer to the Challenge problem. How to measure the current with a Amp meter.