There was another question that I found that was not correct. Whenever I come across it I will send it to you.

Thanks for the study guide.

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(d) – NEC 2011 344.46 ]]>

This question you just have to connect the resistors in series and parallel and check their total resistance for:

Series => When resistors are in series they add to combine. If we calculate the total resistance for each of the multiple choices above we get…

a. 100 Ohms + 300 Ohms = 400 Ohms

b. 1,000 ohms + 1,000 Ohms = 2,000 Ohms

c. 500 Ohms + 500 Ohms = 1,000 Ohms

d. 500 Ohms + 250 Ohms = 750 Ohms

Obviously, none of these answers match the 500 Ohms we need. So the resistors are connected in parallel. Let us find out which 2 resistors are in parallel. Without doing much calculations like for series, when 2 resistors of the same value are connected in parallel we can do a quick total resistance calculation method, which is basically dividing the resistance of 1 resistor by the total number of resistors in parallel (in this case 2). The only obvious choice is (b), because….

1,000 Ohms / 2 = 500 Ohms.

So the answer is (b).

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