1. U3e-L4 1.Get out last night’s homework. 2.Calculate the total resistance of a circuit with 3 resistors (5, 20, and 30 ohms) in series. Sketch a schematic. 3.Calculate the total resistance of a circuit with 3 resistors (5, 20, and 30 ohms) in parallel. Sketch a schematic. March 6, 2008 DRILL

2. Drill Solution #1 R = 5 W + 20 W + 30 W T R = 55 W T U3e-L4

3. Drill Solution #2 1 1 1 = 5 20 30 ++ R R1 + R2 + R3 T 1 1 1 1 =.2 +.05 +.033 R T 1 = R T 1.283 = U3e-L4

4. Drill Solution #2.283 R T 1 = (Multiply both sides by Rt) 1 =.283 x Rt R = 3.53 W T U3e-L4

5. How would you solve the following? Solve the parallel portion first, then add it in series to the series resistor. Problems

6. With ONE PARTNER ONLY, use the rest of class to complete the electrical technology problem sheet. 1.Solve on notebook paper 2.Show all work 3.Work must be neat CLASSWORK U3e-L4