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Name: ___________________________________________ Group: __________ Support activities – Second Year of Secondary Cycle Two ACTIVITY 63 ANSWER KEY Date: __________________ AST STUDENT BOOK: Chapter 14, pages 473–478 RELATED HANDOUT: Concept review 63 Components with other functions 1. Complete the following sentences, using the words or groups of words in the box below. You may use some words more than once. • • • • • • • • amplify bigger block capacitance capacitor collector computer digital circuits • • • • • • • diode(s) direct current direction electrical charge electrical contact electromagnet electromechanical relay • • • • • • • emitter farads high-voltage insulating material light-emitting diodes light-sensitive cells low-voltage • • • • • • • powerful protect relay signal solid-state relay stabilize transistor(s) capacitor a) A ___________________________ is a device composed of two electrical surfaces insulating material separated by an ___________________________ . The device can store an electrical charge ___________________________ . This ability to store energy is called farads capacitance “___________________________ ” and is expressed in ___________________________ . diode b) A ___________________________ is a device that allows electric current to flow in only direction Diodes one ___________________________ . ___________________________ can guide and protect block an electric current, ___________________________ fragile electronic parts and direct current convert alternating current into ___________________________ . Light-emitting diodes ___________________________ (LEDs) give off light when a current flows through them. électroluminescentes transistor c) A ___________________________ is an electronic device used to block amplify ___________________________ or ___________________________ an electric current. It Observatory / Guide 11129-B in the field of electronics. collector is made up of a ___________________________ , a base and an Transistors emitter ___________________________ . ___________________________ play an important role © ERPI Reproduction and adaptation permitted solely for classroom use with Observatory. A capacitor can release its stored charges almost instantly; it can also serve to stabilize ___________________________ a fluctuating power supply. 1 ANSWER KEY Support activities – Second Year of Secondary Cycle Two ACTIVITY 63 Components with other functions Name: ___________________________________________ Group: __________ Date: __________________ relay d) A ___________________________ is a component used to control a high-voltage ___________________________ circuit from a distance with a low-voltage low-voltage ___________________________ circuit. The ___________________________ signal circuit emits a___________________________ that can come from a switch, a computer ___________________________ or a photoelectric (light-sensitive) cell. There electrical contact is no ___________________________ between the two circuits. In an electromechanical relay ___________________________ , the control depends on an electromagnet ___________________________, which causes metallic parts to move. In a solid-state relay ___________________________ , control is made possible by an LED and electromechanical relay light-sensitive cells ___________________________ . An ___________________________ has a shorter life bigger span and photosensibles is ___________________________ , but it can control more powerful solid-state relay ___________________________ circuits. A ___________________________ is usually digital circuits airtight and more compatible with ___________________________ . 2. What am I? a) I can be found in remote controls, where I protect electronic parts when the battery is installed upside down. A diode b) There are millions of me in computers. A transistor c) I am made up of two metal plates separated by a dielectric. d) I am used in theatre lighting systems, the heating systems of public buildings and industrial motors. A relay 3. Explain how a camera flash works. A camera flash works with a capacitor. A battery recharges the capacitor until an indicator lights up. When the photographer presses the shutter button, the capacitor releases its full charge in a Observatory / Guide 11129-B fraction of a second, producing a bright light. © ERPI Reproduction and adaptation permitted solely for classroom use with Observatory. A capacitor 2 ANSWER KEY Support activities – Second Year of Secondary Cycle Two ACTIVITY 63 Components with other functions Name: ___________________________________________ Group: __________ Date: __________________ 4. True or false? If the statement is false, correct the error. a) LED bulbs consume less energy than ordinary light bulbs. True b) In a transistor, the collector acts like a door that can block or facilitate current flow. False. This function is performed by the base. c) Binary code works with the help of capacitors. False. It works with the help of transistors. d) A diode is made of silicon, which is a semiconductor. True 5. How does a diode transform alternating current into direct current? A diode allows electric current to flow in only one direction, so it prevents the back-and-forth Observatory / Guide 11129-B © ERPI Reproduction and adaptation permitted solely for classroom use with Observatory. movement of alternating current. 3 ANSWER KEY Support activities – Second Year of Secondary Cycle Two ACTIVITY 63 Components with other functions
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