1. Starter All resistors in a series circuit have the same _________________. All resistors in a parallel circuit have the same_________________. As you add more resistors in series the equivalent resistance ________. As you add more resistors in parallel the equivalent resistance ________. All resistors in a series circuit have the same _________________. All resistors in a parallel circuit have the same_________________. As you add more resistors in series the equivalent resistance ________. As you add more resistors in parallel the equivalent resistance ________. current. voltage. increases. decreases.

2. Test Formulas Series Circuits R eq = R 1 + R 2 + R 3 I = V / R eq V 1 = I R 1 V 2 = I R 2 V 3 = I R 3 Parallel Circuits R eq = 1 / (1/R 1 +1/ R 2 +1/ R 3 ) I = V / R eq i 1 = V/ R 1 i 2 = V/ R 2 i 3 = V/R 3 Power Dissipated by a Resistor P = i 2 R = iV = V 2 /R Power Sent to a circuit by a Battery P = IV Resistance and resistivity R =  L/A Heat Energy Q = mc  T Current = Charge/time