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Anglicky v odborných předmětech " Support of teaching technical subjects in English “

Anglicky v odborných předmětech " Support of teaching technical subjects in English “. Tutorial : Mechanic - electrician Topic : Technical training II. class Passive components – resistors 1 Prepared by: Melichařík Lubomír.

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Anglicky v odborných předmětech " Support of teaching technical subjects in English “

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  1. Anglicky v odborných předmětech"Support of teaching technical subjects in English“ Tutorial: Mechanic - electrician Topic:Technicaltraining II. class Passivecomponents – resistors 1 Prepared by: Melichařík Lubomír Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.

  2. PASSIVE COMPONENTS – RESISTORS 1 Resistor • Passive electrical component • In an ideal case there is just one property manifested in an electric circuit: • Electrical resistance • The reason for the inclusion of the resistor in the circuit is: • reduce the size of the electric current • obtain a voltage drop. • The component is commonly referred to as resistance, but the name used is a resistor.

  3. RESISTOR Electrotechnical schematic of symbols: Schematic of the resistor symbol used inEurope Schematic of the resistor symbol used inUSA and Japan Schematic of the fixed adjustable resistor symbol – resistance trimmer Schematic of the continuously adjustable resistor symbol - potentiometer

  4. IDEAL AND REAL RESISTOR An Ideal Resistor should have a single parameter, i.e. its resistance and this parameter should not be dependent on any external factors. According to Ohm’s law, therefore, the current flowing through a resistor with resistance R and the applied voltage U was equal to On the contrary, the resulting voltage drop of the same resistor with a current I: The power relationship: the resistor gets hot, which means, that passing a current through it heats it. If no resistor is used as a resistive heating element, the heat is lost. Equivalent circuit of a real resistor Real resistoris, however, made of real materials showing an electrical resistance and has a definite geometry.

  5. PARAMETERS ANDCONSTRUCTION OF A RESISTOR Parameters of resistors -electrical resistance is in ohms -series of preferred numbers E6, E12 or E24 -the most widely used number is E12 -contains the following 12 values, which are then multiplied by the square of the tens: 1,0; 1,2; 1,5; 1,8; 2,2; 2,7; 3,3; 3,9; 4,7; 5,6; 6,8; 8,2 • R1 = 0,1 Ω 10R = 10J = 1 × 10¹ Ω 4M7 = 4,7 × 1MΩ = 4,7 × 106 Ω • k1 = 0k1 = 0,1 . 1 k Ω = 0,1 × 10³ Ω = 1 × 10² Ω = 100 Ω = 100R = 100J • 222 = 22 . 102 Ω = 2200 Ω • -maximum power is in Watts: Values for example 0,6 Watt; 1 Watt, 2 Watt, ... • -tolerance-resistance value of a resistor is given in a percentage(0,5 %; 1 %; 5 %; 10 %; 20 %) Construction of a resistor-wire, carbon, wound, special.

  6. 1. 2. 3. Temp. Colour Multiplier Tolerance Reliability stripe stripe stripe coefficient 0 Black 0 0 0 ×10 1%; 1 Brown 1 1 1 ×10 ±1% (F) 100 ppm 0.1%; 2 Red 2 2 2 ×10 ±2% (G) 50 ppm 0.01%; 3 Orange 3 3 3 ×10 15 ppm 0.001%; 4 Yellow 4 4 4 ×10 25 ppm 5 Green 5 5 5 ×10 ±0.5% (D) 6 Blue 6 6 6 ×10 ±0.25% (C) 10 ppm 7 Violet 7 7 7 ×10 ±0.1% (B) 5 ppm 8 Grey 8 8 8 ×10 ±0.05% (A) 9 White 9 9 9 ×10 1 ppm Gold ×0.1 ±5% (J) Silver ×0.01 ±10% (K) None ±20% (M) LABELLING OF RESISTORS Labelling of resistors • The basic unit for labelling resistors is1 Ω (1 ohm). The value of the resistor is today often indicated by the stripe colour code. The colour coding used is in accordance with the International code EIA-RS-279. • Table of colour codes:

  7. TYPES OF RESISTORS • Miniature ResistorsPower resistors • Resistance trimmers Potentiometers

  8. Activities for students– mandatory slideTask, test, questions… . • 1. What is a resistor? • 2. What is the ideal resistor? • 3. What is a real resistor? • 4. Draw the schematic symbols used in Europe. • 5. Draw the schematic symbols used in USA and Japan. • 6. Draw a diagram of an ideal resistor and write the basic calculation formulas.

  9. Activities for students – mandatory slideTask, test, questions … . Two images are best. • 1. What are the parameters reported in the resistor? • 2. What are the basic designs of resistors? • 3. What are the types of resistors? • 4. What is the use of resistors? • 5. What are the labels of resistors? • 6. What are the characteristic properties of resistors?

  10. Bibliography • Václav Malina Poznáváme elektroniku I. • Adrian Schommers Elektronika tajemství zbavená. ISBN 3-92608-32-5

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