Use your knowledge of the electronic components explained in this chapter to design and build some of the following circuits. 1. A modification of the buzzer game that will allow it to be played by someone who cannot hear.
2. A circuit that will switch on an LED once a certain temperature has been reached. 3. A circuit that will sound an alarm when a light is turned on. 4. A circuit that will light an LED if it detects that a material is a conductor of electricity. 5. Another circuit of your choice. Note: you must be able to give a practical use for the circuit you design.
Science in Society
1. Modern electronics uses many more components than those mentioned in this chapter. These include transistors and capacitors. Find out about one of these components and how it is used in modern circuit boards.
2. Electronics uses microprocessors and ‘chips’. Find out how these were created and how they have changed as technology has developed. What impact have these had on society?
Nature of Science
Electronics are all around us. They have become so common in our daily lives that we tend to use them without realising how dependent on electronics we have become. 1. List three devices you used today that use electronics. 2. Imagine a day in your life if you could not use any electronics. What would you miss most and why?
Chapter Summary
1. In electronic circuits there is an input, a process and an output. 2. Inputs are usually received through sensors. 3. Resistors reduce the flow of current in a circuit. The symbol is:
4. Light dependent resistors (LDRs) are resistors that allow more current to flow through them when more light shines on them. The symbol is:
