# MC Electricity Resistors Review

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1 2. In the circuit shown above, what is the value of the potential difference between points X and Y if the 6 volt battery has no internal resistance? (A) 1 V (B) 2 V (C) 3 V (D) 4 V (E) 6V 8. The circuit shown above left is made up of a variable resistor and a battery with negligible internal resistance. A graph of the power P dissipated in the resistor as a function of the current I supplied by the battery is given above right. What is the emf of the battery? (A) V (B) 0.67 V (C) 2.5 V (D) 6.25 V (E) 40 V 11. The five resistors shown below have the lengths and cross sectional areas indicated and are made of material with the same resistivity. Which resistor has the least resistance? 1

2 Questions The above circuit diagram shows a battery with an internal resistance of 4.0 ohms connected to a 16 ohm and a 20 ohm resistor in series. The current in the 20 ohm resistor is 0.3 amperes 17. What is the emf of the battery? (A) 1.2 V (B) 6.0 V (C) 10.8 V (D) 12.0 V (E) 13.2 V 18. What is the potential difference across the terminals X and Y of the battery? (A) 1.2 V (B) 6.0 V (C) 10.8 V (D) 12.0 V (E) 13.2 V 19. What power is dissipated by the 4 ohm internal resistance of the battery? (A) 0.36 W (B) 1.2 W (C) 3.2 W (D) 3.6 W (E) 4.8 W 21. The product (2 amperes 2 volts 2 seconds) is equal to (A) 8 coulombs (B) 8 newtons (C) 8 joules (D) 8 calories (E) 8 newton amperes Questions refer to the following diagram that shows part of a closed electrical circuit. 22. The electrical resistance of the part of the circuit shown between point X and point Y is (A) 4/3 (B) 2 (C) 2.75 (D) 4 (E) 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 (D) greater at point X than at point Y (B) greater in the 1 resistor than in the 2 resistor (E) greater in the 1 resistor than in the 3 resistor (C) greater in the 2 resistor than in the 3 resistor 29. The operating efficiency of a 0.5 A, 120 V electric motor that lifts a 9 kg mass against gravity at an average velocity of 0.5 m/s is most nearly (A) 7% (B) 13% (C) 25% (D) 53% (E) 75 % 2

3 32. When lighted, a 100 watt light bulb operating on a 110 volt household circuit has a resistance closest to (A) 10 2 (B) 10 1 (C) 1 (D) 10 (E) 100 Questions The batteries in each of the circuits shown above are identical and the wires have negligible resistance. 36. In which circuit is the current furnished by the battery the greatest? (A) A (B) B (C) C (D) D (E) E 37. In which circuit is the equivalent resistance connected to the battery the greatest? (A) A (B) B (C) C (D) D (E) E 38. Which circuit dissipates the least power? (A) A (B) B (C) C (D) D (E) E Questions Four identical light bulbs K, L, M, and N are connected in the electrical circuit shown above. 74. Rank the current through the bulbs. (A) K > L > M > N (B) L = M > K = N (C) L > M > K > N 3

4 (D) N > K > L = M (E) N > L = M > K 75. In order of decreasing brightness (starting with the brightest), the bulbs are: (A) K = L > M > N (B) K = L = M > N (C) K > L = M > N (D) N > K > L = M (E) N > K = L = M 76. Bulb K burns out. Which of the following statements is true? (A) All the light bulbs go out. (B) Only bulb N goes out. (C) Bulb N becomes brighter. (D) The brightness of bulb N remains the same. (E) Bulb N becomes dimmer but does not go out. 77. Bulb M burns out. Which of the following statements is true? (A) All the light bulbs go out. (B) Only bulb M goes out. (C) Bulb N goes out but at least one other bulb remains lit. (D) The brightness of bulb N remains the same. (E) Bulb N becomes dimmer but does not go out. 85. Wire I and wire II are made of the same material. Wire II has twice the diameter and twice the length of wire I. If wire I has resistance R, wire II has resistance (A) R/8 (B) R/4 (C) R/2 (D) R (E) 2R 87. In the accompanying circuit diagram, the current through the 6.0 resistor is 1.0 A. What is the power supply voltage V? (A) 10 V (B) 18 V (C) 24 V (D) 30 V (E) 42 V 89. What is the resistance of a 60 watt light bulb designed to operate at 120 volts? (A) 0.5 (B) 2 (C) 60 (D) 240 (E)

5 92. The diagram above represents a simple electric circuit composed of 5 identical light bulbs and 2 flashlight cells. Which bulb (or bulbs) would you expect to be the brightest? (A) V only (B) V and W only (C) V and Z only (D) V, W and Z only (E) all five bulbs are the same brightness 95. If all of the resistors in the above simple circuit have the same resistance, which would dissipate the greatest power? (A) resistor A (B) resistor B (C) resistor C (D) resistor D (E) they would all dissipate the same power 97. Each member of a family of six owns a computer rated at 500 watts in a 120 V circuit. If all computers are plugged into a single circuit protected by a 20 ampere fuse, what is the maximum number of the computers can be operating at the same time? (A) 1 (B) 2 (C) 3 (D) 4 (E) 5 or more 5

6 Questions An ideal battery, an ideal ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 2.0 amperes With the switch open, what would be the potential difference across the 15 ohm resistor? (A) 30 V (B) 40 V (C) 60 V (D) 70 V (E) 110V 103. With the switch open, what must be the voltage supplied by the battery? (A) 30 V (B) 40 V (C) 60 V (D) 70 V (E) 110 V 104. When the switch is closed, what would be the current in the circuit? (A) 1.1 A (B) 1.7 A (C) 2.0 A (D) 2.3 A (E) 3.0 A 116. Suppose you are given a constant voltage source V 0 and three resistors R 1, R 2, and R 3 with R 1 > R 2 > R 3. If you wish to heat water in a pail which of the following combinations of resistors will give the most rapid heating? 6

7 117. A household iron used to press clothes is marked 120 volt, 600 watt. In normal use, the current in it is (A) 0.2 A (B) 2 A (C) 4 A (D) 5 A (E) 7.2 A 118. For the circuit shown, a shorting wire of negligible resistance is added to the circuit between points A and B. When this shorting wire is added, bulb #3 goes out. Which bulbs (all identical) in the circuit brighten? (A) Only Bulb 2 (B) Only Bulb 4 (C) Only Bulbs 1 and 4 (D) Only Bulbs 2 and 4 (E) Bulbs 1, 2 and A junior Thomas Edison wants to make a brighter light bulb. He decides to modify the filament. How should the filament of a light bulb be modified in order to make the light bulb produce more light at a given voltage? (A) Increase the resistivity only. (B) Increase the diameter only. (C) Decrease the diameter only. (D) Decrease the diameter and increase the resistivity. (E) Increase the length only Approximately how much would it cost to keep a 100 W light bulb lit continuously for 1 year at a rate of \$0.10 per kw hr? (A) \$1 (B) \$10 (C) \$100 (D) \$1000 (E) \$

8 147. Which of the following graphs would best represent the resistance versus temperature relationship for a superconductor? 162. A fixed voltage is applied across the length of a tungsten wire. An increase in the power dissipated by the wire would result if which of the following could be increased? (A) The resistivity of the tungsten (B) The cross-sectional area of the wire (C) The length of the wire (D) The temperature of the wire (E) The temperature of the wire s surroundings 8

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