1. JC Technology
Resistors

2. Resistors
Reduce the current flowing in a circuit

3. Resistors Fixed Resistor
Nominal Value
Nominal Value
Tolerance
Tolerance
Nominal Value = average resistance of resistor
Tolerance = accuracy of resistor

4. Resistors Resistance of Resistor Each coloured band has a value
Black
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Grey 8
White 9
1st Digit
2nd Digit
3rd Digit = number of zeros

5. Resistors Resistance of Resistor 00 1 1 Resistance = 1100Ω = 1.1kΩ
Black
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Grey 8
White 9
1st Digit
2nd Digit
3rd Digit = number of zeros 00 1 1
Resistance = 1100Ω = 1.1kΩ

6. Resistors
Resistance of Resistor

7. 82000Ω Resistors Colour Code for a Resistor Grey Red Orange Black
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Grey 8
White 9
82000Ω
Grey
Red
Orange

8. Resistors Tolerance Colour Code: Orange, orange, brown, gold
Resistance = 330Ω
Maximum resistance = 330+5%
= 346.6Ω
Minimum resistance = 330-5%
= 313.5Ω
Brown
± 1%
Red
± 2%
Gold
± 5%
Silver
± 10%
No band
± 20%

9. Resistors Preferred Values Resistors produced in multiples of 10
E24 Series
± 5%
1.0
1.1
1.2
1.3
1.5
1.6
1.8
2.0
2.2
2.4
2.7
3.0
3.3
3.6
3.9
4.3
4.7
5.1
5.6
6.2
6.8
7.2
8.2
9.1
E12 Series
± 10%
1.0
1.2
1.5
1.8
2.2
2.7
3.3
3.9
4.7
5.6
6.8
8.2

10. Resistors Resistors in Series
Increase the total resistance in a circuit

11. Resistors Variable Resistor Changes the resistance in a circuit
Spindle
Variable Resistor
wiper
Track
Terminals
Longer track = increased resistance

12. Resistors Light Dependent Resistor
Resistance changes with light levels
Symbol

13. Resistors Light Dependent Resistor Daylight = low resistance
Darkness = high resistance

14. Resistors
Thermistor
Resistance changes with temperature
Symbol

15. Resistors Thermistor Negative Temperature Coefficient (NTC)
Resistance decreases as temperature increases