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Free NEC practice questions

Understanding the NEC Articles 90-200 Test (pdf)Download
Understanding the NEC Articles 90-200 Answers (pdf)Download

How to save answers on the iphone calculator

This is helpful when adding up resistors in parallel.  If we have two 20 ohm resistors in parallel we will set them up like this.  1/20 + 1/20 = 0.1.  Then enter 1 / 0.1 which equals 10.  

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