Transcript AVOP-ELEKTRO-MEL-002

Tutorial: Mechanic - electrician
Topic: Technical training
II. class
Passive components – resistors 2
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.
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 Rc is the sum of the
individual resistors
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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 Rc of this circuit is given by:
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Electrotechnical schematic symbols:
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Schematic symbol for the NTC thermistor
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Schematic symbol for the PTC thermistor
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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 Malina
Adrian Schommers
Poznáváme elektroniku I.
Elektronika tajemství zbavená.
ISBN 3-92608-32-5