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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. What is a DC circuit characteristic?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Produce heat - light - or limit current to control it(all of the above)
Cells can be connected together to make a battery
15 -000 ohms - 20%

2. What is dielectric strength?
How much potential difference can a material withstand before breaking down
Fixed - Electrolytic - Variable(all of the above)
Gauge number
Heat and current control(both a and c)

3. Which of the following is a type of resistor?
Fixed - tapped - variable(all of the above)
Parallel circuit
12 volts
Parallel

4. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
The relationship of potential difference to current
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
10%
Current change in a coil creates a magnetic change

5. What type of circuit has two or more paths for current to follow?
Electromagnetic field
Potential difference
Wire splices
Parallel circuit

6. What is the name for electrical resistance of insulation?
Ohms
Tolerence
Relationship between current and potential difference
Insulation resistance

7. What makes electrons flow?
Potential difference
A magnetic field
Electromagnetic field
Choke

8. What is a characteristic of insulators?
10%
Parallel
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Electromagnetic field

9. What does a first band of white mean?
Insulation resistance and Dielectric strength(Both A and B)
Produce heat - light - or limit current to control it(all of the above)
First digit is 9
Resistance value can not be changed

10. What is another name for an inductor?
Symbol
Choke
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Two

11. How is capacitance determined?
Composition of the resistor
Area and spacing of capacitor - static current in the capacitor(both A and B)
15 -000 ohms - 20%
DC current

12. What do electrical charges need to cause a fire or explosion?
Current change in a coil creates a magnetic change
Gauge number
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
The direction the negative charge moves

13. When reading resistance color codes - what does the first band indicate?
Voltage
DC current
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
First digit

14. How many kinds of poles do magnets have?
Electromagnetic field
5%
Two
Fixed - Electrolytic - Variable(all of the above)

15. What is needed for electric heating elements and the filaments of light bulbs?
50 Ohms
Heat
Circular and square mills(Both A and B)
High resistance

16. What is a common measure of wire diameter?
How much potential difference can a material withstand before breaking down
Gauge number
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Cells can be connected together to make a battery

17. What is a wire classification?
Bare - covered - insulated - stranded - cable(All of the above)
Electromagnetism
1/1000th of an inch
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

18. Which way is the current going in the circuit shown?(electron flow)
Relay
From the negative battery terminal to the positive terminal
50 Ohms
Symbol

19. What does static electricity do?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
American wire gauge(AWG)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Does not move

20. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Purging
Symbol
Does not move
Ability to store an electric charge

21. What is true about a dry cell?
Potential difference - E*I - current times current change from point to point(all of the above)
Purging
Common - not rechargable - gradually discharges when in storage(All of the above)
Potential difference

22. What is a common cause of static electricity in a shop?
High resistance
Moving vehicles
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Start with the band on the end and read to the center

23. What does a transformer transform?
Insulation resistance and Dielectric strength(Both A and B)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Electromagnetism
The relationship of potential difference to current

24. What must be large enough to carry the largest current likely to occur?
The rate of doing work
The direction of the magnetic field
Grounding wire
Potential difference

25. What is the unit of measurement of potential difference?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Volts
Ability to store an electric charge
Stores electrical charge

26. What determines the resistance of a resistor?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
5%
How much potential difference can a material withstand before breaking down
Composition of the resistor

27. What is resistance in electrical terms?
Ability to store an electric charge
Magnetic properties
Opposition to electrical current
Chemical action

28. What is capacitance in electrical terms?
Composition of the resistor
Ability to store an electric charge
Stranded
Does not move

29. What is a characteristic of a fixed resistor?
Resistance value can not be changed
Energy
Two
The relationship of potential difference to current

30. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
10%
Potential difference - E*I - current times current change from point to point(all of the above)
Potential difference
Mutual induction

31. What determines whether a spark can be produced?
Strength of the charge
Bare - covered - insulated - stranded - cable(All of the above)
Circular and square mills(Both A and B)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

32. Which of the following materials is NOT a good conductor?
Porcelain
50 Ohms
The direction the negative charge moves
Parallel

33. What is a rigid metal conduit?
Breakdown voltage
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Resistance value can not be changed

34. What is the unit of measurement of electrical current?
By their covering
Amperes
A difference in potential energy
15 -000 ohms - 20%

35. A resistor is color coded brown - green - orange. What is its resistance?
10%
Series circuit
Opposes any change in the current flowing in a circuit
15 -000 ohms - 20%

36. What information do the Left-Hand Rules provide?
High resistance
American wire gauge(AWG)
Fixed - tapped - variable(all of the above)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

37. What is the relationship of conductor size and length to resistance?
Circular and square mills(Both A and B)
Resistance increases as the conductor length increases
Bonding and grounding
Gauge number

38. Which material has the lowest resistance at ordinary temperatures?
Wire splices
Choke
Heat
Silver

39. What is the measure of potential difference?
Wire splices
Produce heat - light - or limit current to control it(all of the above)
Secondary cell
Volts

40. What is a type of capacitor?
Plastic - Rubber - Friction(all of the above)
Grounding wire
Fixed - Electrolytic - Variable(all of the above)
DC current

41. What is the type of cable composed of many fine wires?
Heat and current control(both a and c)
Grounding wire
Stranded
First digit

42. What is power?
The rate of doing work
Current flows in one direction - potential differences across a load does not change(Both A and B)
1/1000th of an inch
Bare - covered - insulated - stranded - cable(All of the above)

43. How do you read resistor color codes?
Energy
Ohms
Start with the band on the end and read to the center
Solenoid and Relay(both A and B)

44. What is voltage?
Parallel circuit
A difference in potential energy
1/1000th of an inch
Bare - covered - insulated - stranded - cable(All of the above)

45. What is the purpose of resistors in electrical circuits?
Produce heat - light - or limit current to control it(all of the above)
Mutual induction
Insulation resistance and Dielectric strength(Both A and B)
Wire splices

46. Where does the thumb point in both Left-Hand Rules?
The direction the negative charge moves
How much potential difference can a material withstand before breaking down
Tolerence
Moving vehicles

47. What does resistance produce?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
From the negative battery terminal to the positive terminal
The relationship of potential difference to current
Heat

48. What instrument measures voltage?
From the negative battery terminal to the positive terminal
Voltmeter
Electromagnetic field
Gauge number

49. To what measurement do the conductor mills refer?
1/1000th of an inch
1 watt
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
High resistance

50. What is an electromagnet?
Porcelain
Tolerence
Resistance increases as the conductor length increases
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside