S1S1 S2S2 R1R1 R1R1 R1R1 R2R2 ΔV = 120 V R 1 = 20 Ω R 2 = 10 Ω A Find the current at point A for all possible combinations of switch settings. (In each case, redraw the circuit in the simplest possible way before finding the current.)

R1R1 R2R2 ΔV = 6 V ΔV = 4 VΔV = 5 V R 1 = 100 Ω R 2 = 50 Ω AB Find the current in each resistor and the potential difference between points A and B.

R R1R1 R2R2 R 1 = 10 Ω R 2 = 4 Ω R 3 = 7 Ω R3R3 ΔV = 24 V 1.Assume R = 5 Ω. What is the current running through each resistor in the circuit? 2.Assume R is very large (say, 5000 Ω). What then is the current running through the battery? What physical situation does this correspond to? 3.Assume R is very small (say, Ω). What then is the current running through the battery? What physical situation does this correspond to?