Question

What is the effective resistance of a parallel circuit composed of three 15 Ohm resistors? Select one:a.3/15 Ohmsb.15 Ohms c.3 Ohmsd.5 Ohms

Answer 1

First, let us draw the situation. We have the following:

When resistors are connected in parallel, their resulting resistance can be calculated as:

`(1)/(R_t)=(1)/(R_1)+...+(1)/(R_n)`

Then, in our case:

`(1)/(R_t)=(1)/(15)+(1)/(15)+(1)/(15)=(3)/(15)`

Then, our total resistance is:

`R_t=(15)/(3)=5\Omega`

Our final answer is R=5 Ohms