$5\mathrm{.}4$: Build the circuit shown at right using the PhET. Choose three different values for $R1,R2,$ and $R3$ and record them in your notebook. Close the switch and record $A_1,A_2,A_3,V_1,V_2,$ and $V_3.$ Using these values and Ohm's law, calculate $R1,R2,$ and $R3.$ Compare these values to the actual value of the resistors.

$5\mathrm{.}5$: Calculate the total value of the three resistors using the formula in $3\mathrm{.}5.$

$5\mathrm{.}6$: Change the circuit so that you are measuring the current and voltage across all three resistors. Calculate the total resistance using Ohm's Law. Compare this value to the one you calculated in $5\mathrm{.}5.$