Chapter+4+Lesson+1

Chapter 4: Electronics I. Electronic signal and semiconductors. A. Electrical versus electronic devices 1. the way they use current 2. Electrical- light bulbs, toasters, etc. i need continues supply of electric current B electronics- use of electric current to control, communicate and process info. !. use electric signals- varying electric that represents info. 2. any info that can be measured or numbered, whether it is electrical or not, it can be converted to a signal

C. two types off signal 1. analog- current is varied smoothly to represent information. i tube thermometer 2 digital- pulses of current are used to represent information. i. carries information in pulses or steps ii digital bank thermometer d semiconductors- a material that conducts current better than insulators but not as well as conductor. 1. conducts current only under certain conditions. devices 2 transmit an electrical signal- an electronic device must be able to vary current thru a circuit. semiconductors vary currents in electronic devices. 3 two types i. n-type (negative) adding atoms with extra electrons to silicons. a.) has room for electrons. iii. layered to make diodes, transistors and integrated circuits. 4 diodes- electronic component that consists of an n-type and p type semiconductors joined together. i. can change alternating current to direct current ii. can be used as a switch. 5. transistors- when a layer of one type f semiconductors is sandwiched between 2 layers of the other type of semiconductors. i. 2 uses A.) amplifies an electronic signal. \B.) switches on or off ii. made amplifiers much cheaper and more reliable 6. intergrated circuits- a thin slice of semiconductors that contain many diodes, transistors and other electronic components. i. AKA- chips. A.) smaller than 1mm on each side can contain 100 of 1000 components. ii. individual electronic components combined into larger groups.

Quiz!!!!!!! 1. E 2. BCF 3. AD 4. each is electronic signal, analog is smooth, digital pulses 5. Diode are n-type or p-type semiconductors joined together. transistor layer of 1 type of semiconductor between 2 layers of the other type. intergrated circuit- thin slice of semiconductor that has many diodes, transistors and other electronic components 6. analog signal 7.diode 8.integrated circuit 9.electronics 10.transistor 11 digital signal 12.electronic signal 13semiconductor

Study guide 1 toaster 10.only electronic devices use current as a means of carrying info. 11. electronic signal 12.integrated circuit 14. transistor 16. false diode 23. its a material that conducts current only under certain conditions. all the current in electronic devices to vary and carry info.