19. The electrical resistance of the part of the circuit shown between point X and point Y is (A) 1.4 (B) 2.5 (C) 6.2 (D) 10 20. When there is a steady current in the circuit, the amount of charge passing a point per unit of time is: (A) the same everywhere in the circuit (B) greater at point X than at point Y (C) greater in the 2 resistor than in the 5 resistor (D) the same in the 2 resistor and in the 5 resistor 21. A certain coffeepot 2.0 A of current when it is operated on 110 V household lines. If electrical energy costs 10 cents per kilowatt-hour, how much does it cost to operate the coffeepot for 5 hours? (A) 2.4 cents (B) 4.8 cents (C) 8.0 cents (D) 11 cents Questions 22-24 Five identical light bulbs are connected to a 120 V power supply. Each light bulb has a resistance of 15 The switch is closed. Ω. 22. What is the net resistance of the circuit? (A) 3 (B) 30.1 (C) 40 (D) 75 Ω Ω Ω Ω 23. What is the current in the light bulb L1? (A) 1.6 A (B) 3 A (C) 8 A (D) 40 A
19. The electrical resistance of the part of the circuit shown between point X and point Y is (A) 1.4 (B) 2.5 (C) 6.2 (D) 10 20. When there is a steady current in the circuit, the amount of charge passing a point per unit of time is: (A) the same everywhere in the circuit (B) greater at point X than at point Y (C) greater in the 2 resistor than in the 5 resistor (D) the same in the 2 resistor and in the 5 resistor 21. A certain coffeepot 2.0 A of current when it is operated on 110 V household lines. If electrical energy costs 10 cents per kilowatt-hour, how much does it cost to operate the coffeepot for 5 hours? (A) 2.4 cents (B) 4.8 cents (C) 8.0 cents (D) 11 cents Questions 22-24 Five identical light bulbs are connected to a 120 V power supply. Each light bulb has a resistance of 15 Ω. The switch is closed. 22. What is the net resistance of the circuit? (A) 3 Ω (B) 30.1 Ω (C) 40 Ω (D) 75 Ω 23. What is the current in the light bulb L1? (A) 1.6 A (B) 3 A (C) 8 A (D) 40 A
ap_physics_i-electric_circuit_mc_problems.docx