1. Complex Circuits Electricity can be pretty dangerous. My nephew tried to stick a penny into a plug. Whoever said a penny doesnt go far didnt see him shoot across the floor. I told him he was grounded. »Tim Allen

2. Short Circuit? Can you draw the circuit required for Johnny 5 to restart after being shut off?

3. Complex Circuits Resistors may be connected in a circuit in a variety of series-parallel combinations. A procedure for analyzing complex circuits is as follows: –Find R T, V T, I T –Find I Series (That is, the current through the series portion of that part of the circuit.) –Find V Series (With V=IR) –Find V Parallel (V T – V Series ) –Find I Parallel –Find Power

4. Problem #1 If the battery has a voltage of 20 volts, R1= 8 ohms, R2 = 8 ohms, and R3 = 6 ohms… Solve the circuit. R2 R1 R3

5. Equivalent Resistance

6. Problem #2 What are the voltage across and the current in each of the resistors R1 through R5 in the preceding figure? –Answer: 8.00 Ω 18.0 V3.00 A 6.00 V1.50 A 2.25 V0.38 A 2.25 V1.13 A 3.75 V1.50 A

7. Sheep Herding, just for fun.

8. Problem #3 One 25 Ω resistor and one 15 Ω resistor are connected in parallel. This combination is connected between the terminals of a 75.0 volt battery. A 50.0 Ω resistor is also connected across the battery, in series with the parallel combination. (a) How much current is supplied by the battery? (b) How much power is dissipated in one of the 25.0 Ω resistors? –Answer: