10th May 2011
We were given 6 resistors and a colour code identification sheet to allow calculation of each specific resistor. The basic principle of the coloured bands is that the last band is the tolerance percentage of the resistor, the 2nd to last the multiplier and the other bands will be the numbers taken down to represent the value of the resistor.
There are 4-Band resistors and 5-Band resistors. This does not necessarily mean that the 5-Band resistor has a greater resistance than that of a 4-Band however. The intensity of the resistor is entirely dependent on the multiplier.
The activity that we were given meant we had to write down each colour in the order it was on each of the resistors and give the value of each based on the identification chart. We then had to figure out the low tolerance value and the high tolerance level of each. From there we were to measure the value with the multi-meter to see if the value was correct and the resistor passed. 4/6 passed and the other 2/6 were unreadable on the multi-meter as they were too high a value.
From that chart we were to choose two resistors from the list we had just made and write the values of these down. From there we had to put the resistors in a series circuit (end to end, one right after the other) and measure the combined value, the result of which was 2,070 ohms. Following that, the resistors then needed to be put in a parallel circuit (both sets of ends connected, almost a circle), the result of which was 78.3 ohms.
REPORT:
What principles of electricity have you demonstrated with this? Explain:
Showed the difference between resistors in series circuit and in parallel circuit. The total resistance in the series circuit is the sum of both the resistors added, however the total resistance in a parallel circuit is divided amongst the different pathways. The total resistance will always be lower than the lowest resistor.
good overview
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