HW

C - as identified yesterday; the homework below will be yours for Friday

E - Investigate Ohm's Law. As always, physicsclassroom.com may be a good source.

Is Ohm's law always true?

Problems to try:

1. A 100-ohm resistor is connected directly to a 9-V battery. What is the current through the resistor? What is the current everywhere else in the circuit? What voltage would you read "over" the resistor? If you did this as an experiment, what might you expect to see - how would the measured values compare to the theoretical; why?

2. Now imagine that you have two resistors (50-ohm, 150-ohm) in series (one right after the other) with a 20-V battery. Find the following:

a. the total resistance of the circuit
b. the total current from the battery
c. the current through each resistor
d. the voltage over each resistor
e. draw a schematic for this problem

This problem may seem a little challenging for you - we haven't done one like this before. Try it, no matter what.

On Thursday (E) we will perform the Ohm's Law lab, measuring voltages and currents for several resistors. You'll love it - resistance is futile.