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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