modified 8 years ago

resistors

00:49:23

100 / 200 are in parallel.
100 / 300 are in parallel.
these both groups are in series.

published 8 years ago

LeButch

8 years ago

Wow, you can see really good.

Robert_Kidd

8 years ago

Indeed they are! Now, can you do the maths to prove EC has got all the currents correct?

andreiA9

8 years ago

yes I did the maths :) the current at the above 100R resistor is 23.2mA the current at the 200R is 11.(6) the current at the 300R is 8.7mA not sure why EC has approximated the values differently.

Robert_Kidd

8 years ago

Your calculations are not quite right, but close. The numbers have to be rounded off to 2 decimal places by EC. The parallel combination of 100 & 300 gives 75 Ohms. However, the 100 & 200 parallel combination gives approx 66.666666666 recurring. This makes the sums a bit more tricky and EC rounds the result. EC shows mid-point voltage as 2.65V. The actual value is more like 2.647058823529412 to 14 decimal places. You can see where the ‘inaccuracy’ come in.

Robert_Kidd

8 years ago

To 4 decimal places the currents are: Left top 23.5294, top right 11.7647, bottom left 26.4705, bottom right 8.8235.

andreiA9

8 years ago

Now, i was really appreciating that you spent time to show me how important is to consider at least 3 decimals when calculating this! My calculations now are exactly as yours

Robert_Kidd

8 years ago

Excellent! Pleased to help.

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