1. Introducing Components Resistor Basics ELECTRONICS (PART 2 OF 4) Developed by Jonathan Freese WCED: METRO SOUTH EDUCATION DISTRICT

2. RESISTORS Resistors control the flow of current that flows in a circuit. Where there is high resistance, little current will flow. E.g. the buzzer will not be loud Where there is low resistance, a larger current will flow. E.g. the buzzer will be louder CURRENT BEFORE CURRENT AFTER

3. RESISTORS PROTECT LEDS The main function of resistors in a circuit is to control the flow of current to other components. If too much current flows through the LED it will be destroyed. A resistor is used to control the amount of current.

4. THE VALUE OF RESISTANCE Resistors are too small to print numbers on them. A colour code system is used to indicate the value of resistance The resistors that we use most often have four colour bands. Each colour represents a value 1 st figure 2 nd figure multipliertolerance 1 st band 4 th band2 nd band 3 rd band

5. 4 7 x 10 = 470 Ω 7 5 x 100 = 7500 Ω Resistor colour Code Chart: 4 Band Resistors