Welcome to this experimental science test. We hope that you will find it interesting and worthwhile. Carefully read through these directions and the directions on the next page before you begin to work.

You may be part of a group for the first part of this exercise. Each group should carry out the experiment and collect the data together, but each student must record the data in his or her own booklet. Be sure to record the data exactly as you observe them. After the data have been collected, each student should answer the questions independently.

After you have finished your experiment and have recorded all of the data, you will be asked to answer some questions about the experiment and the data you recorded. Your answers must be written in this test booklet in the space provided. Make sure that you understand each question before you begin to write. At any time while you are writing your answers, you may look back at the directions for the experiment and the data you collected. Be sure that your answers are written as clearly and neatly as possible.

Before you turn the page, read the list of materials given below and check to make sure that your group has everything listed.

Your lab team has been hired to help remodel a house so people who do not have the use of their hands will be able to turn the lights on and off.

For the device to work you will need to:

• make a circuit that conducts electricity
• design a switch to turn the circuit on and off
• adapt your design for people who do not have the use of their hands

Step 1. Make sure you can light a bulb.

Use the materials you have been given to create the circuit shown in the diagram.

Does the light bulb light? If it does not, check to be sure that you have constructed the circuit properly and ask your teacher to make sure that your bulb and battery are working.

Step 2. Build a switch.

A switch is a device that can be used to connect and break the circuit so that the bulb will turn off and on. Once the bulb in your circuit lights, use the materials you have been given to create a switch. Work with your switch until you can use it to turn the light bulb on and off. Add the switch to the circuit. Each member of the group should draw a diagram of the circuit in his or her own booklet. In your drawing, you must show all parts of the circuit and the switch. Each of the parts must be clearly labeled. When you have finished your drawing, return to your desk to finish Question 1 and work on Question 2.

Please answer the following questions by yourself.

1. Draw your circuit and switch. Explain how the switch works.

2. Now figure out how you could change the design of the switch so that a person without the use of his or her hands could use it. Draw a diagram of your circuit showing the changes to the circuit and switch that would allow a person to turn it off and on without the use of hands. In your drawing, you must show all parts of the circuit and the switch. Each of the parts must be clearly labeled. Explain how this switch works.