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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 silver - this means the measured value of the resistance is what percent of the marked value?
Heat and current control(both a and c)
Opposition to movement of free electrons
10%
Purging

2. What type of circuit has one path of follow through a load?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Symbol
Secondary cell
Series circuit

3. What does an object have if a magnetic field acts on it?
Opposition to electrical current
Magnetic properties
Insulation resistance
The direction the negative charge moves

4. What is a type of capacitor?
Does not move
Fixed - Electrolytic - Variable(all of the above)
15 -000 ohms - 20%
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

5. What is the purpose of capacitors in electrical circuits?
Ohms
Stores electrical charge
Fixed - tapped - variable(all of the above)
Serial

6. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
By their covering
Cables
Serial
Grounding wire

7. Why is the transformer important to AC electricity?

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8. What is a switch that operates by electricity?
Symbol
Relay
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Relationship between current and potential difference

9. What is another name for an inductor?
Choke
DC current
Electromagnetic field
Fixed - Electrolytic - Variable(all of the above)

10. What is the type of cable composed of many fine wires?
How much potential difference can a material withstand before breaking down
Stranded
High resistance
The relationship of potential difference to current

11. What does resistance produce?
Heat
1/1000th of an inch
Produce heat - light - or limit current to control it(all of the above)
Volts

12. How do you read resistor color codes?
1 watt
Start with the band on the end and read to the center
High resistance
How much potential difference can a material withstand before breaking down

13. Which of the following materials is NOT a good conductor?
Potential difference
Voltmeter
Porcelain
DC current

14. How is the heat production measured in a resistor?
By their covering
Potential difference - E*I - current times current change from point to point(all of the above)
Secondary cell
Opposition to movement of free electrons

15. What can permanently break down a capacitor?
Breakdown voltage
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Opposition to electrical current
Serial

16. What is a wire classification?
Volts
By their covering
Bare - covered - insulated - stranded - cable(All of the above)
Choke

17. Where does the thumb point in both Left-Hand Rules?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Insulation resistance and Dielectric strength(Both A and B)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
The direction the negative charge moves

18. What are the common units of measurement for round and square conductor cross - sections?
Circular and square mills(Both A and B)
Two
Purging
Voltage

19. To what measurement do the conductor mills refer?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Opposition to electrical current
1/1000th of an inch

20. What does a transformer transform?
The relationship of potential difference to current
Area and spacing of capacitor - static current in the capacitor(both A and B)
Serial
Electromagnetic field

21. What makes electrons flow?
Potential difference
Voltage
Use an effect to produce another effect
Does not move

22. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Voltage
By their covering
Parallel
5%

23. What is a common form used in conductors?
Potential difference
Relationship between current and potential difference
1 watt
Cables

24. How is capacitance determined?
Area and spacing of capacitor - static current in the capacitor(both A and B)
15 -000 ohms - 20%
Wire splices
Parallel

25. What is needed for electric heating elements and the filaments of light bulbs?
High resistance
Unlike poles attract
50 Ohms
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

26. What does Ohm's Law represent?
Stores electrical charge
Opposes any change in the current flowing in a circuit
Relationship between current and potential difference
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

27. What is the unit of measurement of resistance?
Ohms
1 watt
A difference in potential energy
Potential difference

28. What makes electrons flow?
Magnetic properties
Heat
Potential difference
A difference in potential energy

29. What wire measurement is commonly used in the U.S.?
American wire gauge(AWG)
A magnetic field
Porcelain
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

30. What is power?
Composition of the resistor
Electrical resistance against the flow of current
The rate of doing work
Wire splices

31. What does static electricity do?
Produce heat - light - or limit current to control it(all of the above)
Does not move
Heat and current control(both a and c)
American wire gauge(AWG)

32. When reading resistance color codes - what does the first band indicate?
Opposes any change in the current flowing in a circuit
First digit
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)
Series circuit

33. What is induction?
Current change in a coil creates a magnetic change
Secondary cell
Use an effect to produce another effect
Silver

34. What is a DC circuit characteristic?
How much potential difference can a material withstand before breaking down
Potential difference - E*I - current times current change from point to point(all of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Mutual induction

35. What is the term for doing work at the rate of joule per second?
1 watt
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)
Energy
Relay

36. The dry cell is what method for creating potential energy?
Electromagnetic field
Mutual induction
Chemical action
Current change in a coil creates a magnetic change

37. What do electrical charges need to cause a fire or explosion?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
American wire gauge(AWG)
Breakdown voltage
75 Ohms

38. What is a conductor?
Insulation resistance and Dielectric strength(Both A and B)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Breakdown voltage

39. What is the fundamental property of insulators?
Volts
Insulation resistance and Dielectric strength(Both A and B)
1 watt
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)

40. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Choke
5%
Purging
Resistance increases as the conductor length increases

41. What are the two generic methods to eliminate static electricity from metal objects?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Energy
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Bonding and grounding

42. What type of circuit has two or more paths for current to follow?
Parallel circuit
Alternating current
Grounding wire
Resistance value can not be changed

43. Given E=I X R and the following information - plug in the data and solve the problem for voltage. 0.015 ohms - 800 amps of current
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
12 volts
Tolerence
Use an effect to produce another effect

44. What is an arrangement of materials that create a potential difference by chemistry?
A magnetic field
Does not move
Cell
Gauge number

45. What is the relationship of conductor size and length to resistance?
Amperes
Resistance increases as the conductor length increases
American wire gauge(AWG)
Purging

46. What is a common cause of static electricity in a shop?
Moving vehicles
10%
Ohms
Electrical resistance against the flow of current

47. What is a way to classify wires and cables?
Circular and square mills(Both A and B)
By their covering
Stranded
Does not move

48. What is the relationship between magnetism and electricity?
Chemical action
Area and spacing of capacitor - static current in the capacitor(both A and B)
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)
Voltmeter

49. Where do the fingers point in both Left-Hand Rules?
Energy
The direction of the magnetic field
Alternating current
Produce heat - light - or limit current to control it(all of the above)

50. What is the unit of measurement of potential difference?
Insulation resistance and Dielectric strength(Both A and B)
Symbol
Volts
Unlike poles attract