Applied Science - Technology (4A) Lab
 OBJECTIVES: Constructing circuit boards. Discovering uses of electricity. VOCABULARY: circuit conductor electron MATERIALS: cardboard (weaving cards) wire wire stripper 10 paper clips alligator clips two 1 1.2 volt dry cell a flashlight bulb and bulb holder Students make their own circuit boards.
 BACKGROUND: An electric current is the flow of electric charge which transports energy from one place to another. It is measured in amperes, where 1 ampere is the flow of 6 1/4 billion-billion electrons (or protons) per second. However, no current exists unless there is a complete pathway or circuit through which electrons may flow. The flow of electricity through a circuit can be stopped by breaking or opening the circuit with a switch. By closing the circuit the flow of electricity can be restored. Students will get a "simple" look at how electricity works by making a "quiz board." A quiz board not only illustrates a simple circuit but also gives students experience working with electric circuits. This is a simple example of how to make an electronic game board. Their finished product will allow them to ask questions that are wired into the correct answer. When the person matches the answer with the question, a bulb will light up telling them it is the correct match. PROCEDURE: Holding the cardboard lengthwise, attach 5 paper clips about an inch apart along the left side. Attach the remaining 5 paper clips to the right side in a direct line with the corresponding clips on the left. Number the clips 1-10 (see diagram).    Hook the alligator clip to one of the paper clips on the left side of the cardboard and match it to a paper clip on the right side. Remember to mix up the sequence when making a quiz board. If using wires, make sure to scrape off the insulation. Connect the wires from a left paper clip to a right paper clip. Make sure the connections are firm. Devise a list of 5 questions. Write them on small slips of paper and put them under each of the 5 paper clips on the left side of the cardboard. Write the answers to the questions on 5 other slips of paper and put them under the corresponding paper clip on the right side. The circuit will be completed with the correct question/answer combination.    To complete the circuit, set up the light bulb and the battery as in the diagram. Read the first question and try to make a connection. Connect the alligator clips from the paper clip with the question to a paper clip with the correct answer. If the correct connection is made between the question and answer, the bulb lights up.    This circuit board illustrates that through planning using logic, you can derive answers. This elemental circuitry is at the base of advanced circuitry.