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Electricity Practice Test 1

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1. This diagram represents a closed circuit with threelight bulbs and a 10-volt battery.

If Bulb 3 burns out in the circuit, what will mostlikely happen?

A. Bulb 1 and Bulb 2 will continue to glow.

B. Bulb 1 and Bulb 2 will not glow as brightly.

C. Bulb 1 will glow, but Bulb 2 will not glow.

D. Bulb 1 and Bulb 2 will not glow.

2. This diagram represents a DC circuit. Eachresistor has a value of 5.1 Ω.

If R3 is removed from the circuit, how muchcurrent will flow through the circuit?

A. 1.2 A B. 1.6 A C. 2.4 A D. 4.8 A

3. This diagram represents a circuit with three20-ohm light bulbs. The battery is 10 volts.

If light bulb 3 burns out in the circuit, what willhappen to light bulb 1 and light bulb 2?

A. Light bulb 1 and light bulb 2 will work.

B. Light bulb 1 and light bulb 2 will not work.

C. Light bulb 1 will work, but light bulb 2 willnot work.

D. Light bulb 1 will not work, but light bulb 2will work.

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4. In these diagrams, all light bulbs are identical.In which circuit would the light bulbs be thedimmest?

A.

B.

C.

D.

5. Jeff used a multimeter to test the current andresistance of a variable resistor and plotted theresults on the graph below.

The graph shows that current

A. increases when resistance decreases.

B. decreases when resistance decreases.

C. increases when resistance increases.

D. doubles when resistance increases.

page 2 Electricity Practice Test 1

6. Which set of resistors has the smallest equivalentresistance?

A.

B.

C.

D.

7. What is the main advantage of using alternatingcurrent (AC) over direct current (DC) whentransmitting electricity?

A. AC has fewer power surge problems than DC.

B. AC power lines need less insulation than DCpower lines.

C. AC makes it easier to step voltage up ordown with transformers, as compared to DC.

D. AC is not affected by the use of transformers,but the use of DC requires transformers.

8. A flashlight bulb connected to a 6-V battery drawsa 0.5-A current. What is the power used by theflashlight bulb?

A. 1.25 W B. 3 W

C. 6.5 W D. 12 W

9. What is the relationship between I1 and I2?

A. 1I = 4I2 B. 1I = 2I2

C. 2I = 2I1 D. 2I = 4I1


10. Object X and Object Y are rubbed together.Object X acquires a negative charge. What doesObject Y experience?

A. a gain of protons B. a loss of protons

C. a gain of electrons D. a loss of electrons

11. The electric potential at a point is 20 V. Howmuch work is needed to bring a charge of 0.5 Cfrom infinity to that point?

A. The work required to move the charge is equalto the electric potential at the point times theamount of charge being moved; therefore, 10 Jof work is needed for this charge.

B. The work required to move the charge isequal to the electric potential at the pointit is being moved to because the forces areequal and opposite; therefore, 20 J of work isneeded for this charge.

C. The work required to move the charge isequal to the electric potential at the point overthe amount of charge being moved; therefore,40 J of work is needed for this charge.

D. The work required to move the charge isequal to the electric potential at the pointover the square of the amount of charge beingmoved; therefore, 100 J of work is needed forthis change.

12. What is the power dissipated in the resistor in thecircuit below?

A. 2.4 W B. 14 W C. 29 W D. 60 W

13. The diagram represents a DC circuit.

What is the total resistance of the circuit?

A. 25 Ω B. 28 Ω C. 39 Ω D. 58 Ω


14. Which circuit has the most current flowing through it?

A. B.

C. D.


15. Two balloons are hanging from a ceiling.

The balloons are attracted to each other becausethe balloons have

A. neutral charges. B. opposite charges.

C. a positive charge. D. a negative charge.

16.

In this circuit, what is the current through the2-ohm resistor?

A. 0.2 A B. 0.8 A C. 5.0 A D. 8.0 A

17. A positively charged ball is placed an equaldistance between two charged objects (1 and 2).In which case will the positively charged ballmove toward Object 2?

A.

B.

C.

D.


18. Three light bulbs are connected to a 120-Vpotential difference. Ammeters are placed at fourdifferent locations labeled #1, #2, #3, and #4.

At which location will the current be greatest?

A. #1 B. #2 C. #3 D. #4

19. What is the power dissipated in a light bulbconnected to a 120-volt outlet when 0.50 ampereflows through it?

A. 0.0042 W B. 60. W

C. 240 W D. 7,200 W

20. A series circuit has a current of 3 A. The circuitcontains a 12-Ω resistor. What is the voltage ofthe circuit?

A. 0.25 V B. 4 V

C. 15 V D. 36 V

21. The diagram below represents a complete circuit.

What is the current flowing in the entire circuit?

A. 9.0 A B. 6.0 A C. 3.0 A D. 2.0 A

22. A 75-watt lamp is connected to a 120-V powersupply. How much current flows through thelamp?

A. 0.40 A B. 0.63 A

C. 1.6 A D. 2.0 A

23. Which is a true statement about a series circuit?

A. All the current flows through every part ofthe circuit.

B. Every part of the circuit is positively charged.

C. The current through the circuit can takeseveral paths.

D. Every part of the circuit is negatively charged.


24. This diagram represents a DC circuit. Analyze thecircuit, and answer the questions below.

a) What is the total resistance in this circuit?

b) How much current is flowing through thiscircuit?

c) How could a student rearrange the resistorsin this circuit to allow more current to flowthrough it?

25. In which circuit does the voltmeter read thegreatest value?

A.

B.

C.

D.


26. Two charged spheres separated by a distance, d,exert a force of F Newtons on each other.

The distance between the spheres is doubled andthe magnitude of the charge of one sphere isdoubled. What is the magnitude of the resultingforce in comparison to the original force, F?

A. 4F B. 2F C.F

2D.

F

4

27. The diagram represents a DC circuit.

What is the voltage of the battery when theammeter reads 4.0 amperes?

A. 0.22 V B. 1.0 V

C. 4.5 V D. 16 V

28. The diagram below is of a circuit with a resistor.

How much power does the resistor use?

A. 0.38 W B. 4.5 W

C. 85 W D. 380 W

29. A motor has a current of 2 A flowing through itwhen it is powered with a 12-V battery. What isthe power used by the motor?

A. 0.16 W B. 6 W

C. 14 W D. 24 W

30. To double the current through a resistor in acircuit,

A. double the voltage across the resistor.

B. double the resistance of the resistor.

C. double the voltage across the resistor anddouble the resistance.

D. double the resistance and decrease the voltageacross it by half.


31. A heater has a resistance of 10.0 Ω. It operateson 120.0 V. What is the current through theresistance?

A. 120. A B. 80.0 A

C. 24.0 A D. 12.0 A

32. Which set of charges will experience the greatestmagnitude of electrostatic force between them?

A.

B.

C.

D.

33. What is the resistance of a hair dryer that uses2.5 A when the voltage is 120 V?

A. 4.8 ohms B. 48 ohms

C. 120 ohms D. 300 ohms

34. A series circuit has a 6-V battery and 3 ohms ofresistance. How much current will flow throughthe circuit?

A. 0.5 A B. 2 A C. 3 A D. 18 A

35. Two charged particles are 0.080 m apart. They aremoved until the force between them is 16 timesgreater. How far apart are the charges?

A. 0.0050 m B. 0.020 m

C. 0.040 m D. 0.16 m


36. A student wants to measure the current flowingthrough and the voltage across R1 in the circuit.Which configuration is correct?

A.

B.

C.

D.

37. A circuit contains a voltage source and fourresistors connected in series. If the voltage isdecreased by one-half, what will happen to thecurrent flowing through the circuit?

A. The current will decrease by one-fourthbecause current has an inverse relationship tothe number of resistors that are in series.

B. The current will decrease by one-half becausecurrent has a direct relationship to the voltageof the circuit.

C. The current will double because current hasan inverse relationship to the voltage of thecircuit.

D. The current will quadruple because currenthas a direct relationship to the number ofresistors that are in series.

38. What happens when a positively charged rodtouches a neutral metal sphere?

A. Protons move from the sphere to the rod.

B. Protons move from the rod to the sphere.

C. Electrons move from the sphere to the rod.

D. Electrons move from the rod to the sphere.


39. A student moves a charged needle near anelectrically neutral copper cylinder.

Which statement describes what will happen whenthe needle first touches the cylinder?

A. The needle will become positively charged.

B. Negative charge will flow from the needle tothe cylinder.

C. The charge will be forced out of the needleand into the air.

D. Repulsion between the needle and the cylinderwill increase.

40. Why are parallel circuits, rather than seriescircuits, commonly used in wiring houses?

A. They allow appliances to operate separately.

B. They are cheaper.

C. They have a higher total resistance.

D. The voltage drop varies with each resistor.


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Electricity Practice Test 1 1/31/2018

1.Answer: D

2.Answer: A

3.Answer: A

4.Answer: D

5.Answer:

6.Answer: A

7.Answer: C

8.Answer: B

9.Answer: B

10.Answer: D

11.Answer: A

12.Answer: C

13.Answer: C

14.Answer: C

15.Answer: B

16.Answer: C

17.Answer: C

18.Answer: A

19.Answer: B

20.Answer: D

21.Answer: A

22.Answer:

23.Answer: A

24.Answer:

25.Answer: C

26.Answer: C

27.Answer: D

28.Answer: B

29.Answer: D

30.Answer:

31.Answer: D

32.Answer: A

33.Answer: B

34.Answer: B

35.Answer: B

36.Answer: D

37.Answer: B

38.Answer: C

39.Answer: B

40.Answer: A

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