Quick Math Solution: Solve the Easy Problem Now!

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The discussion centers on interpreting the notation "II" in the context of calculating total resistance in a circuit. It suggests that "II" indicates the total resistance is found by adding two parallel branches, one with two series resistors (R2, R3) and another with a single resistor (R4). The formula for total resistance in parallel is provided, emphasizing its utility in larger circuits. The notation is described as unconventional but practical for certain calculations. Understanding this notation is essential for solving related electrical problems effectively.
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Easy math problem ...

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My question is just what do II means?
 
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Me thinketh that it means that you get the total resistance by adding the two parallel branches of resistances. In the one branch are two resistors in series (R2,R3), in the other branch a single resistor (R4). It is your teacher's own private unconventional notation.
 
This notation comes in handy if you have to deal with larger circuits and I've seen and used it myself before as well.

The total resistance R for two parallel resistors R1 and R2 can be written as:

R=(R_1 \parallel R_2)=\frac{R_1\,R_2}{R_1+R_2}

Regards,

nazzard
 
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