# NOT RUN {
## Resistance of four resistors in series:
resistance(series(rep(1,5)),1,5) ##sic! FOUR resistors have FIVE nodes
## What current do we need to push into a circuit of five equal
## resistors in order to maintain the potentials at 1v, 2v, ..., 6v?
circuit(series(rep(1,5)),v=1:6) #(obvious, isn't it?)
## Now, what is the resistance matrix of four nodes connected in series
## with resistances 1,2,3 ohms?
Wu(series(1:3)) #Yup, obvious again.
# }
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