Download Reviewer for Consumer Electronics Services I and more Lecture notes Consumer Electronics in PDF only on Docsity! REVIEWER Electricity - Flow of electric charge. - A fundamental quantity in nature consisting of electrons and protons at rest or in motion. Types of Electricity 1. Current – a progressive movements of free electrons along a conductor wire or a circuit. The unit measure of a current is Ampere (A). The letter symbol to represent is I. 2. Voltage – is a force that pulls and pushes electrons along a conductor wire or circuit. The unit measure of voltage is Volt (V). The letter symbol to represent is V or E. 3. Resistance – a total opposition to the flow of current. The unit measure of resistance is Ohm ( ). The letter symbol to represent is R. Power - Often described as the circuits ability to do work. Valence Electrons - Located in an outer orbit of the atom. Ohm’s Law - The relationship of voltage and current wherein the voltage is directly proportional to current while current is indirectly proportional to resistance. - If the voltage increases, then the current also increases. - If the resistance increases, then the current decreases. - V = IR Electrostatic Force - Force that operates between charges. Law of Electrostatics Like charges REPEL Unlike charges ATTRACT Coulomb (C) - Unit of electric charge. - Unit measured ammeter - 1C = 6.238792x1018 electron charges Joule (J) - Unit of energy. Insulator - Used to protect us from dangerous effect of electricity flowing through conductors. - It doesn’t transmit energy. Examples: plastic, wood, air, rubber, glass Conductors - Conduct electric current very easily because of their free electrons. Examples: copper, aluminum, gold, and silver Why do some materials conduct electricity while some do not? - All materials do not act as conductors because of absence of free electrons. Battery - Converts chemical energy into electric energy by means of electrochemical. - It produces electrons through electrochemical and contains positive and negative terminals. Speed of Light and Radio Waves - They are tend to migrate from one atom to another. - Radio waves moves at the speed of light. Sources of Electricity 1. COAL POWERPLANT 2. WINDMILL POWERPLANT 3. SOLAR PANEL (POWERPLANT) – Output voltage is DC. 4. GEOTHERMAL POWERPLANT 5. HYDRO POWERPLANT 6. POWER GENERATOR (GAS)
