DC Circuits
Notes:
Record the values of your resistors.
R
1
= ___________________
R
2
= ___________________
Part 1
: Build the circuit
a) Vary V from 0 V to 25 V (roughly equal spacing), recording the current and voltage for each.
b) Plot
V ve
rsus I on paper or in Excel. From your graph determine what the resistance value R is.
c) Calculate the % difference of this value of R from the value recoded at the top of the page.
Part 2
: Build the circuit
a) Vary V from 0 V to 25 V (rou
ghly equal spacing), recording the current and voltage for each.
b) Plot V versus I on paper or in Excel. From your graph determine what the
equivalent resistance seen
by the voltage supply
.
c) Calculate the % difference
of this value from the value
you expect from the
recoded
resistances
at
the top
of the page
.
Show your calculation of this equivalent resistance.
Part 3
: Build the circuit
a) Vary V from 0 V to 25 V (roughly equal spacing), recording
al three
current
s
and
the
voltage f
or each.
b) Do the three currents “add up” correctly? How do you tell?
c
) Plot V versus I
(for the voltage supply)
on paper or in Excel. From your graph determine what the
equivalent resistance seen by the voltage supply.
d
) Calculate the % differe
nce of this value from the value you expect from the recoded resistances at
the top of the page.
Show your calculation of this equivalent resistance.
Q1:
Explain.
Q2:
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