1. Resistance How to read the strength of a resistor

2. Colour coding on resistors Resistors are coated with ceramic.

3. Resistor  Black0 Brown1 Red2 Orange3 Yellow4 Green5 Blue6 Violet7 Gray8 White9 2 1st 2nd 3rd 3 0 000  1 st colour = 1 st # 2 nd colour = 2 nd # 3 rd colour = # of zeros

4. Resistor Tolerance Digit 0123456789 Colour BlackBrownRedOrangeYellowGreenBlueVioletGreyWhiteGoldSilver Tolerance ±5%±10% The last band is gold or silver in colour. They give the accuracy range. The last example had silver  10% 230 000 Ω + 10 % The resistor can be off by 10%

5. Put table here. Violet, green, brown, gold 750 Ω + 5% 5% of 750 = 0.05 x 750 = 37.5 Ω 750 – 37.5 = 712.5750 + 37.5 = 787.5 Range = 712.5 Ω – 787.5 Ω Digit 0123456789 Colour BlackBrownRedOrangeYellowGreenBlueVioletGreyWhiteGoldSilver Tolerance ±5%±10% Please tape/glue table & write the following points into notebook.

6. Activity to practice reading resistors Get out a sheet of paper. 1per 2 students ◦ Write #1 to #10 ◦ Names at the top Obtain a resistor board from the front. Find the resistance & tolerance range for 8 of the 10 resistors. Hand-in when done. ◦ Mark will be included in Competency 1. Names: Resistor #StrengthRange example750 Ω + 5% 712.5 Ω - 787.5 Ω #1 #2 #3... Your paper should look like this.