Question about resistors in Parallel

[4evanaday]

Homework Statement

I need to devise an experiment to show that the total resistance decreases as additional resistors are added to a parallel circuit of resistors. All resistances of the resistors are the same.

Homework Equations

R(Total)=1/R(1)+1/R(2)+...+1/R(n)

The Attempt at a Solution

So far I can work it out mathematically say the resistance of the resistors is 20 Ω

For two resistors:
R(Total)=10 Ω
For three:
R(Total)≈6.7

So I can confirm that the total resistance of the circuit is increasing but I'm having problems devising the experiment.

Thanks in advance! :D

 

[Spinnor]

This has been done before, see,

https://www.google.com/search?hl=en...w.,cf.osb&fp=20d79f0a81e4895c&biw=734&bih=439