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Engineering
Unit 5 – Electrical and electronic circuits and
systems
Subject - Unit XX
Level 3 Diploma
Unit 6 – Electrical and electronic Principles
Resistors
© Pearson Education Ltd 2008. Copying permitted for purchasing institution only. This material is not copyright free.
Unit 5 – Electrical and electronic circuits and
systems
Subject - Unit XX
Resistors
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Resistors are used in almost every electronic circuit.
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They are used to control the flow of current and provide precise voltages.
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Values are in Ω, kΩ and MΩ.
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Their accuracy, or tolerance, is measured as a percentage deviation from
the exact ideal value that they should be.
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They have a power rating – the maximum amount of power that they can
dissipate.
© Pearson Education Ltd 2008. Copying permitted for purchasing institution only. This material is not copyright free.
Unit 5 – Electrical and electronic circuits and
systems
Subject - Unit XX
Resistor markings
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Carbon and metal oxide resistors
are marked according to a colour
code.
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Four and five band codes are in
common use.
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Other resistor types have values
written on them.
© Pearson Education Ltd 2008. Copying permitted for purchasing institution only. This material is not copyright free.
Unit 5 – Electrical and electronic circuits and
systems
Subject - Unit XX
PNEUMONICS TO AID MEMORY
0 Bad
1 Beer
2 Rots
3 Our
4 Young
5 Guts
6 But
7 Vodka
8 Gets
9 Worse
© Pearson Education Ltd 2008. Copying permitted for purchasing institution only. This material is not copyright free.
Unit 5 – Electrical and electronic circuits and
systems
Subject - Unit XX
Common types of resistor
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Carbon film resistors (<2 W)
Ceramic clad wirewound (7 W)
Metal clad (15 W)
Miniature skeleton preset
potentiometer
Multi-turn preset potentiometer
Carbon track potentiometer
Multi-turn variable potentiometer
Light-dependent resistor (LDR)
Temperature-sensitive
(thermistor)
© Pearson Education Ltd 2008. Copying permitted for purchasing institution only. This material is not copyright free.
Unit 5 – Electrical and electronic circuits and
systems
Subject - Unit XX
© Pearson Education Ltd 2008. Copying permitted for purchasing institution only. This material is not copyright free.