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Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky. Tutorial: Mechanic - electrician Topic: Technical training II. class Passive components – resistors 2 Prepared by: Melichařík Lubomír
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Serial and parallel connection of resistors Resistors may be connected (or arranged): - serial (in a row) - parallel (beside each other).
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-in serial order the same current flows in all resistors -voltage is distributed to each resistor according to Ohm’s law -total resistance R c is the sum of the individual resistors Rc = R1 + R2 …..+ Rn
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-as a symbol of a parallel connection of resistors we use two lines „||“ -for two resistors connected in parallel you can use the simplified relationship:
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-to calculate the combination of a serial and parallel connection we will use the two preceding relationships -for example, the total resistance R c of this circuit is given by:
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Electrotechnical schematic symbols: Schematic symbol for the NTC thermistor Schematic symbol for the PTC thermistor A thermistor is: -electrical component whose resistance is dependant on temperature: There are two types of thermistors -NTC, known as a negistor – the components resistance decreases with heat -PTC, known as a pozistor- resistance increases with heat.
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1. Calculate the resulting resistance of this series of resistors. 2. Calculate the resulting resistance of these resistors connected in parallel.
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1. Calculate the resulting resistance of these resistors connected in series and parallel.
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Václav MalinaPoznáváme elektroniku I. Adrian Schommers Elektronika tajemství zbavená. ISBN 3-92608-32-5
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