Posted by **charlie** on Monday, February 23, 2009 at 11:30am.

In a 9V circuit, all the resistors are 20 or 40 kilo Ohms.

Convention says that calcs should therefore be quoted to 1 sig fig, since the volts are the least accuracy.

2 seems better though. Any ideas?

- Math/Physics -
**drwls**, Monday, February 23, 2009 at 12:21pm
Carrying an extra sig. fig. is always a good idea, since the first significant digit of whatever you are computing (such as current in this case) may be a low one like 1 or 2.

1 +/- 0.5 is precision, but 9 +/- 0.5 is 0.55% precision.

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