Electricity Practice Test 1 Name: ate: 1. This diagram represents a closed circuit with three light bulbs and a 10-volt battery. 3. This diagram represents a circuit with three 20-ohm light bulbs. The battery is 10 volts. If ulb 3 burns out in the circuit, what will most likely happen?. ulb 1 and ulb 2 will continue to glow.. ulb 1 and ulb 2 will not glow as brightly.. ulb 1 will glow, but ulb 2 will not glow.. ulb 1 and ulb 2 will not glow. If light bulb 3 burns out in the circuit, what will happen to light bulb 1 and light bulb 2?. Light bulb 1 and light bulb 2 will work.. Light bulb 1 and light bulb 2 will not work.. Light bulb 1 will work, but light bulb 2 will not work.. Light bulb 1 will not work, but light bulb 2 will work. 2. This diagram represents a circuit. Each resistor has a value of 5.1 Ω. If R 3 is removed from the circuit, how much current will flow through the circuit?. 1.2. 1.6. 2.4. 4.8 page 1
4. In these diagrams, all light bulbs are identical. In which circuit would the light bulbs be the dimmest? 5. Jeff used a multimeter to test the current and resistance of a variable resistor and plotted the results on the graph below.... The graph shows that current. increases when resistance decreases.. decreases when resistance decreases.. increases when resistance increases... doubles when resistance increases. page 2 Electricity Practice Test 1
6. Which set of resistors has the smallest equivalent resistance?. 8. flashlight bulb connected to a 6-V battery draws a 0.5- current. What is the power used by the flashlight bulb?. 1.25 W. 3 W. 6.5 W. 12 W... 9. What is the relationship between I 1 and I 2? 7. What is the main advantage of using alternating current () over direct current () when transmitting electricity?. has fewer power surge problems than.. power lines need less insulation than power lines.. makes it easier to step voltage up or down with transformers, as compared to.. is not affected by the use of transformers, but the use of requires transformers.. 1 I = 4I 2. 1 I = 2I 2. 2 I = 2I 1. 2 I = 4I 1 page 3 Electricity Practice Test 1
10. Object X and Object Y are rubbed together. Object X acquires a negative charge. What does Object Y experience? 12. What is the power dissipated in the resistor in the circuit below?. a gain of protons. a loss of protons. a gain of electrons. a loss of electrons. 2.4 W. 14 W. 29 W. 60 W 11. The electric potential at a point is 20 V. How much work is needed to bring a charge of 0.5 from infinity to that point?. The work required to move the charge is equal to the electric potential at the point times the amount of charge being moved; therefore, 10 J of work is needed for this charge.. The work required to move the charge is equal to the electric potential at the point it is being moved to because the forces are equal and opposite; therefore, 20 J of work is needed for this charge.. The work required to move the charge is equal to the electric potential at the point over the amount of charge being moved; therefore, 40 J of work is needed for this charge.. The work required to move the charge is equal to the electric potential at the point over the square of the amount of charge being moved; therefore, 100 J of work is needed for this change. 13. The diagram represents a circuit. What is the total resistance of the circuit?. 25 Ω. 28 Ω. 39 Ω. 58 Ω page 4 Electricity Practice Test 1
14. Which circuit has the most current flowing through it?.... page 5 Electricity Practice Test 1
15. Two balloons are hanging from a ceiling. 17. positively charged ball is placed an equal distance between two charged objects (1 and 2). In which case will the positively charged ball move toward Object 2?. The balloons are attracted to each other because the balloons have.. neutral charges.. opposite charges.. a positive charge.. a negative charge... 16. In this circuit, what is the current through the 2-ohm resistor?. 0.2. 0.8. 5.0. 8.0 page 6 Electricity Practice Test 1
18. Three light bulbs are connected to a 120-V potential difference. mmeters are placed at four different locations labeled #1, #2, #3, and #4. 21. The diagram below represents a complete circuit. t which location will the current be greatest?. #1. #2. #3. #4 What is the current flowing in the entire circuit?. 9.0. 6.0. 3.0. 2.0 19. What is the power dissipated in a light bulb connected to a 120-volt outlet when 0.50 ampere flows through it?. 0.0042 W. 60. W 22. 75-watt lamp is connected to a 120-V power supply. How much current flows through the lamp?. 0.40. 0.63. 1.6. 2.0. 240 W. 7,200 W 23. Which is a true statement about a series circuit? 20. series circuit has a current of 3. The circuit contains a 12-Ω resistor. What is the voltage of the circuit?. 0.25 V. 4 V. 15 V. 36 V. ll the current flows through every part of the circuit.. Every part of the circuit is positively charged.. The current through the circuit can take several paths.. Every part of the circuit is negatively charged. page 7 Electricity Practice Test 1
24. This diagram represents a circuit. nalyze the circuit, and answer the questions below. 25. In which circuit does the voltmeter read the greatest value?. a) What is the total resistance in this circuit?. b) How much current is flowing through this circuit? c) How could a student rearrange the resistors in this circuit to allow more current to flow through it?.. page 8 Electricity Practice Test 1
26. Two charged spheres separated by a distance, d, exert a force of F Newtons on each other. 28. The diagram below is of a circuit with a resistor. The distance between the spheres is doubled and the magnitude of the charge of one sphere is doubled. What is the magnitude of the resulting force in comparison to the original force, F?. 4F. 2F. F 2. F 4 How much power does the resistor use?. 0.38 W. 4.5 W. 85 W. 380 W 27. The diagram represents a circuit. 29. motor has a current of 2 flowing through it when it is powered with a 12-V battery. What is the power used by the motor?. 0.16 W. 6 W. 14 W. 24 W What is the voltage of the battery when the ammeter reads 4.0 amperes? 30. To double the current through a resistor in a circuit,. 0.22 V. 1.0 V. 4.5 V. 16 V. double the voltage across the resistor.. double the resistance of the resistor.. double the voltage across the resistor and double the resistance.. double the resistance and decrease the voltage across it by half. page 9 Electricity Practice Test 1
31. heater has a resistance of 10.0 Ω. It operates on 120.0 V. What is the current through the resistance? 34. series circuit has a 6-V battery and 3 ohms of resistance. How much current will flow through the circuit?. 120.. 80.0. 0.5. 2. 3. 18. 24.0. 12.0 32. Which set of charges will experience the greatest magnitude of electrostatic force between them?... 35. Two charged particles are 0.080 m apart. They are moved until the force between them is 16 times greater. How far apart are the charges?.. 0.0050 m. 0.020 m. 0.040 m. 0.16 m 33. What is the resistance of a hair dryer that uses 2.5 when the voltage is 120 V?. 4.8 ohms. 48 ohms. 120 ohms. 300 ohms page 10 Electricity Practice Test 1
36. student wants to measure the current flowing through and the voltage across R 1 in the circuit. Which configuration is correct?. 37. circuit contains a voltage source and four resistors connected in series. If the voltage is decreased by one-half, what will happen to the current flowing through the circuit?. The current will decrease by one-fourth because current has an inverse relationship to the number of resistors that are in series.. The current will decrease by one-half because current has a direct relationship to the voltage of the circuit.. The current will double because current has an inverse relationship to the voltage of the circuit... The current will quadruple because current has a direct relationship to the number of resistors that are in series.. 38. What happens when a positively charged rod touches a neutral metal sphere?. Protons move from the sphere to the rod... Protons move from the rod to the sphere.. Electrons move from the sphere to the rod.. Electrons move from the rod to the sphere. page 11 Electricity Practice Test 1
39. student moves a charged needle near an electrically neutral copper cylinder. 40. Why are parallel circuits, rather than series circuits, commonly used in wiring houses?. They allow appliances to operate separately.. They are cheaper.. They have a higher total resistance.. The voltage drop varies with each resistor. Which statement describes what will happen when the needle first touches the cylinder?. The needle will become positively charged.. Negative charge will flow from the needle to the cylinder.. The charge will be forced out of the needle and into the air.. Repulsion between the needle and the cylinder will increase. page 12 Electricity Practice Test 1
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