Please work on these problems during your class today. Be nice to the substitute. You can work together until the substitute says you can't. If you are asked to work at your seat and quietly, then that is what you will do.

thank you,

Mr. K.

Last Regular Homework of the Fall Semester (Next week will be a full semester review)

Ohm's Law

(Simple)

1. What potential difference is required to produce a 35 mA current in a 47 Ω resistance?

2. What current is produced by a 12 V potential difference in a 68 Ω resistance?

3. What resistance is required where a 6 V battery is to deliver a 45 mA current?

(More Interesting)

For the following questions, three resistors, of 5, 12 and 15 ohms are networked and connected to a 12 V battery.

4. If the resistors are in series:

a. what is the total resistance?

b. What is the current through each?

c. What is the potential difference across each?

d. How much power is delivered to each?

e. Explain how the loop rule applies.

5. If the resistors are in parallel:

a. what is the total resistance?

b. What is the current through each?

c. What is the potential difference across each?

d. How much power is delivered to each?

e. Explain how the junction rule applies.

6. The 5 Ω resistor is in series with the combination of the other two, in parallel with each other:

a. What is the total resistance (hint: solve the parallel part first)

b. What is the potential difference across the 5 Ω resistance?What

c. is the current through the 15 ohm resistance?

d. Explain how the loop rule applies.

e. Explain how the junction rule applies.

7. The 5 Ω and 12 Ω resistances are in series. That combination is then placed in parallel with the 15 Ω resistance.

a. What is the potential difference across the 15 Ω resistance?

b. What is the total resistance of the network?

c. What is the total current in the network?

d. Explain how the loop rule applies.