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RESISTANCE PowerPoint Presentation

RESISTANCE

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RESISTANCE

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  1. RESISTANCE

  2. RESISTANCE • Ohm – Unit for resistance • Circular Wires • Circular mils • 1000 mils = 1 inch

  3. RESISTANCE • Malleability- property of a metal to be deformed by compression without cracking or rupturing. • Ductility- In a tensile test, ductile metals show considerable elongation eventually failing by necking, with consequent rapid increase in local stresses

  4. RESISTANCE • Wire Table •  AWG • Temperature Effect on Resistance • Superconductors

  5. RESISTANCE Types of resistors • Fixed • Variable • Potentiometer • Three legs • Changes Voltage • Rheostat • Two legs • Changes Current

  6. RESISTANCE • Resistor Color Code • 0 – Black • 1 - Brown • 2 – Red • 3 – Orange • 4 - Yellow • 5 – Green • 6 – Blue • 7 – Violet • 8 – Gray • 9 – White

  7. RESISTANCE • Conductance – Ability of a material to allow current to flow • Ohmmeters – Used to measure resistance • Thermistors - A variable resistance thermistor that changes resistance as the engine's coolant temperature changes • Varistors - A varistor is a type of resistor with a significantly non-ohmic current-voltage characteristic