# Equivalent resistance if the values of the two resistances

Two resistors are in series. Find the equivalent resistance if the values of the two
resistances are as follows.
a) 10 [Ω] and 20 [Ω].
b) 100 [Ω] and 1 [MΩ] (M stands for “Mega” or million).
c) 3.0 [kΩ] and 6.7 [kΩ] (k stands for “kilo” or thousand).
d) 400 [Ω] and 1 [Ω].

Repeat the above problem, assuming that the resistors are in parallel.

Can anybody hel me with this, please? I have no idea how to start/do this. Thank you!

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Defennder
Homework Helper

To start you off, what do you know about how to find equivalent resistance of resistors in series and parallel?

parallel has the same voltage and the current in series stays the same?

M11

Series resistors:

Requivalent=R1+R2+R3+.......+Rn

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Parallel resistors:

( 1/ Requivalent) = ( 1 / R1) + ( 1/ R2) +........+ ( 1/ Rn)

OR you can use the following equation if you have two parallel resistors:

Requivalent=$$\frac{R1 \times R2}{R1 + R2}$$

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So I just add them? a) would be 30 then.
Thank you, that works:)

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