Question

Help me get started on these problems dealing with series circuits?

Answer 1

You have two relationships:

The total resistance (also called the effective resistance) of resistors in series is the sum of those resistors. That is, Rt = R1 + R2. If you had more than two resistors, the total resistance would be the sum of all resistances put together.

You also have I = V / R. If you are given the current and the voltage, as you are in the two circuits on the left, you can use I and V to solve for the unknown resistance R.

Is that helpful?

Answer 2

in a way yes. so R would equal 5/2 on the first one?

Answer 3

Correct.

Answer 4

and what would the other r be? and how do i figure that out?

Answer 5

In a very similar manner.

\[V = I (R + 18)\]

Answer 6

no i meant for Reff on problem one

Answer 7

Reff equals R because there is only one resistor.

Answer 8

oh ok so both answers are the same. on the ones with more that one resistor all i do to find reff is add all the resistors up right?