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Basic Electricity

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
High resistance
20%
From the negative battery terminal to the positive terminal
Potential difference

2. What do transducers do in electrical terms?
Plastic - Rubber - Friction(all of the above)
Use an effect to produce another effect
Secondary cell
Electrical resistance against the flow of current

3. Identify the blueprint symbol for capacitors.
Series circuit
Two
Symbol
Cables

4. To what measurement do the conductor mills refer?
DC flows continuously in one direction and AC potential difference and current both change direction
1/1000th of an inch
Current flows in one direction - potential differences across a load does not change(Both A and B)
Voltmeter

5. What wire measurement is commonly used in the U.S.?
Start with the band on the end and read to the center
American wire gauge(AWG)
Relationship between current and potential difference
Wire splices

6. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Alternating current
From the negative battery terminal to the positive terminal
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

7. How many kinds of poles do magnets have?
Two
Magnetism produces a field and the field exerts force on a moving charge - every moving electrical charge produces a magnetic field - and the magnetic field is strong when the electrical charge is strong and moves rapidly(all of the above are true)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
The direction of the magnetic field

8. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Breakdown voltage
Composition of the resistor
10
Serial

9. What results when current is run through a material with high resistance?
By their covering
Tolerence
50 Ohms
Heat and current control(both a and c)

10. How is capacitance determined?
Insulation resistance
Area and spacing of capacitor - static current in the capacitor(both A and B)
Choke
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

11. What do we call the ability to do work?
Wire splices
10%
Solenoid and Relay(both A and B)
Energy

12. Given R=E / I and the following information - plug in the data and solve the problem for resistance. 1.5 volt walkman battery - 0.02 amps of current
15 -000 ohms - 20%
Mutual induction
75 Ohms
1 watt

13. What does a first band of white mean?
10%
Area and spacing of capacitor - static current in the capacitor(both A and B)
First digit is 9
Volts

14. What type of circuit has one path of follow through a load?
Series circuit
Two
Grounding wire
Cell

15. What is an arrangement of materials that create a potential difference by chemistry?
Cell
A difference in potential energy
Potential difference
Heat

16. What does resistance produce?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Ohms
Bonding and grounding
Heat

17. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Insulation resistance
Area and spacing of capacitor - static current in the capacitor(both A and B)
10%
Amperes

18. What is the unit of measurement of electrical current?
Amperes
Heat
Electromagnetic field
1 watt

19. What is a common form used in conductors?
Cables
Secondary cell
Insulation resistance and Dielectric strength(Both A and B)
Stores electrical charge

20. Which way is the current going in the circuit shown?(electron flow)
From the negative battery terminal to the positive terminal
1/1000th of an inch
Does not move
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

21. What type of circuit has two or more paths for current to follow?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Parallel circuit
Tolerence
Heat

22. What is power?
Ability to store an electric charge
Electrical resistance against the flow of current
The rate of doing work
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

23. What is the term for two or more cells attached together?
Battery
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Moving vehicles
Resistance increases as the conductor length increases

24. What is the unit of measurement of resistance?
Strength of the charge
Ohms
Electromagnetic field
DC flows continuously in one direction and AC potential difference and current both change direction

25. What is the difference between AC and DC?
15 -000 ohms - 20%
First digit is 9
Voltmeter
DC flows continuously in one direction and AC potential difference and current both change direction

26. What does an object have if a magnetic field acts on it?
15 -000 ohms - 20%
Composition of the resistor
Cells can be connected together to make a battery
Magnetic properties

27. What is capacitance in electrical terms?
Energy
Ability to store an electric charge
Bare - covered - insulated - stranded - cable(All of the above)
Heat

28. The thermocouple uses which method for creating potential energy?
Energy
Heat
20%
Current change in a coil creates a magnetic change

29. Which of the following is a type of resistor?
Circular and square mills(Both A and B)
Fixed - tapped - variable(all of the above)
Opposes any change in the current flowing in a circuit
Common - not rechargable - gradually discharges when in storage(All of the above)

30. When reading resistance color codes - what does the fourth band indicate?
Series circuit
Tolerence
It increases or decreases the potential difference of AC electricity - It is effective with almost no loss of power - It's use- cost is very low(All of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

31. What must be large enough to carry the largest current likely to occur?
10
Unlike poles attract
Grounding wire
Heat and current control(both a and c)

32. How is the heat production measured in a resistor?
Alternating current
American wire gauge(AWG)
Potential difference - E*I - current times current change from point to point(all of the above)
Ohms

33. When does a DC circuit oppose current flow?
Parallel
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Plastic - Rubber - Friction(all of the above)

34. What is the relationship between cells and batteries?
Cells can be connected together to make a battery
Choke
Insulation resistance and Dielectric strength(Both A and B)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

35. What is the use of the electromagnet?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Strength of the charge
Cables
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

36. What is the purpose of resistors in electrical circuits?
American wire gauge(AWG)
By their covering
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Produce heat - light - or limit current to control it(all of the above)

37. What is the purpose of capacitors in electrical circuits?
Symbol
Stranded
Stores electrical charge
Current flows in one direction - potential differences across a load does not change(Both A and B)

38. What does Ohm's Law represent?
Parallel
Relationship between current and potential difference
Relay
Magnetic properties

39. What is a wire classification?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Symbol
Bare - covered - insulated - stranded - cable(All of the above)

40. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
Circular and square mills(Both A and B)
75 Ohms
High resistance

41. What does a third band of brown mean?
Symbol
10
First digit is 9
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

42. What information do the Left-Hand Rules provide?
Stores electrical charge
Amperes
12 volts
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

43. What is insulation resistance?
Does not move
Unlike poles attract
Electrical resistance against the flow of current
Cells can be connected together to make a battery

44. What is a characteristic of a fixed resistor?
The relationship of potential difference to current
Relationship between current and potential difference
The direction of the magnetic field
Resistance value can not be changed

45. What are the names of two of the six primary methods of producing a voltage?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Plastic - Rubber - Friction(all of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
DC current

46. How do you read resistor color codes?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Resistance increases as the conductor length increases
Insulation resistance and Dielectric strength(Both A and B)
Start with the band on the end and read to the center

47. What do electrical charges need to cause a fire or explosion?
Wire splices
Strength of the charge
First digit is 9
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

48. What is a conductor?
The direction the negative charge moves
Stranded
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Voltmeter

49. What is a switch that operates by electricity?
Electrical resistance against the flow of current
Relay
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Fixed - Electrolytic - Variable(all of the above)

50. What makes electrons flow?
Potential difference
Moving vehicles
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
10