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## Homework Statement

I have 4 resistors R

_{1}=R

_{2}=R

_{3}=R

_{4}=40[tex]\Omega[/tex]

I need to find the Equivalent Resistance when they are connected in series and when they are connected in parallel.

The problem is my answer for the parallel differs from the answer given in the book.

## Homework Equations

Series: R=R

_{1}+R

_{2}+R

_{3}+R

_{4}

Parallel: R=[tex]\frac{R_{1}*R_{2}*R_{3}*R_{4}}{R_{1}+R_{2}+R_{3}+R_{4}}[/tex]

## The Attempt at a Solution

The first is easy: 4*40=160

Parallel: R=[tex]\frac{40^{4}}{40*4}[/tex]=16000[tex]\Omega[/tex]

in the book the answer is: 10[tex]\Omega[/tex]