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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 the purpose of capacitors in electrical circuits?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Stores electrical charge
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Amperes

2. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
The direction the negative charge moves
Current change in a coil creates a magnetic change
Alternating current
50 Ohms

3. What determines whether a spark can be produced?
Gauge number
Strength of the charge
Potential difference - E*I - current times current change from point to point(all of the above)
Cell

4. Identify the blueprint symbol for capacitors.
Heat
Relationship between current and potential difference
Symbol
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

5. What is the unit of measurement of electrical current?
The relationship of potential difference to current
First digit is 9
Amperes
75 Ohms

6. What is another name for an inductor?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Opposition to electrical current
Choke
High resistance

7. What is voltage?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Common - not rechargable - gradually discharges when in storage(All of the above)
DC current
A difference in potential energy

8. What do we call the ability to do work?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Choke
Volts
Energy

9. Which of the following is a type of resistor?
Fixed - tapped - variable(all of the above)
50 Ohms
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Potential difference

10. What is dielectric strength?
How much potential difference can a material withstand before breaking down
50 Ohms
Parallel
Produce heat - light - or limit current to control it(all of the above)

11. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Bonding and grounding
Fixed - Electrolytic - Variable(all of the above)
50 Ohms
Electromagnetism

12. What is the relationship between magnetism and electricity?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
A difference in potential energy
Insulation resistance
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)

13. What does Ohm's Law represent?
Gauge number
American wire gauge(AWG)
Relationship between current and potential difference
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

14. Why is the transformer important to AC electricity?

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15. How is the heat production measured in a resistor?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
By their covering
Potential difference - E*I - current times current change from point to point(all of the above)
Symbol

16. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
Opposes any change in the current flowing in a circuit
75 Ohms
Chemical action

17. What is a switch that operates by electricity?
Electrical resistance against the flow of current
Relay
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Potential difference

18. What is a DC circuit characteristic?
The rate of doing work
Amperes
Stranded
Current flows in one direction - potential differences across a load does not change(Both A and B)

19. How many kinds of poles do magnets have?
Two
Choke
Chemical action
Potential difference - E*I - current times current change from point to point(all of the above)

20. What are the two generic methods to eliminate static electricity from metal objects?
Bonding and grounding
Parallel
By their covering
Solenoid and Relay(both A and B)

21. What do junction boxes protect?
Heat
The relationship of potential difference to current
Wire splices
Resistance increases as the conductor length increases

22. What information do the Left-Hand Rules provide?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Symbol
1/1000th of an inch
Potential difference

23. What type of circuit has one path of follow through a load?
Cables
Current change in a coil creates a magnetic change
Series circuit
Composition of the resistor

24. What type of circuit has two or more paths for current to follow?
Cell
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Stores electrical charge
Parallel circuit

25. What does a third band of brown mean?
Area and spacing of capacitor - static current in the capacitor(both A and B)
From the negative battery terminal to the positive terminal
10
Fixed - Electrolytic - Variable(all of the above)

26. What is the name for electrical resistance of insulation?
Insulation resistance
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Resistance increases as the conductor length increases
1/1000th of an inch

27. What instrument measures voltage?
Voltmeter
The relationship of potential difference to current
Relationship between current and potential difference
Parallel circuit

28. What does a moving charge produce?
From the negative battery terminal to the positive terminal
A magnetic field
Chemical action
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

29. What determines the resistance of a resistor?
Composition of the resistor
Ability to store an electric charge
Choke
Opposition to movement of free electrons

30. What is a characteristic of insulators?
Volts
Current flows in one direction - potential differences across a load does not change(Both A and B)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
The direction the negative charge moves

31. What does a transformer transform?
10%
The relationship of potential difference to current
Battery
Composition of the resistor

32. Which of the following materials is NOT a good conductor?
Produce heat - light - or limit current to control it(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Porcelain
Bonding and grounding

33. What is power?
Secondary cell
Strength of the charge
The rate of doing work
Start with the band on the end and read to the center

34. What is the relationship of conductor size and length to resistance?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
The direction of the magnetic field
Series circuit
Resistance increases as the conductor length increases

35. Identify the general blueprint symbol for inductors.
Breakdown voltage
How much potential difference can a material withstand before breaking down
1/1000th of an inch
Symbol

36. Where do the fingers point in both Left-Hand Rules?
Heat
The direction of the magnetic field
Opposition to electrical current
Choke

37. What are the names of two of the six primary methods of producing a voltage?
Opposes any change in the current flowing in a circuit
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Amperes

38. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Mutual induction
20%
Current flows in one direction - potential differences across a load does not change(Both A and B)
10

39. What is the purpose of resistors in electrical circuits?
Fixed - tapped - variable(all of the above)
12 volts
Produce heat - light - or limit current to control it(all of the above)
Ohms

40. What is the term for two or more cells attached together?
Heat
Battery
Solenoid and Relay(both A and B)
Current change in a coil creates a magnetic change

41. 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
12 volts
First digit
Opposition to movement of free electrons
Magnetic properties

42. What makes electrons flow?
First digit is 9
Potential difference
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Parallel

43. What results when current is run through a material with high resistance?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
1 watt
Potential difference
Heat and current control(both a and c)

44. What is a type of capacitor?
Opposition to movement of free electrons
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Fixed - Electrolytic - Variable(all of the above)
First digit

45. What is resistance?
How much potential difference can a material withstand before breaking down
Opposition to movement of free electrons
Stranded
Resistance increases as the conductor length increases

46. What makes electrons flow?
How much potential difference can a material withstand before breaking down
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Potential difference
12 volts

47. What is a wire classification?
A magnetic field
Bare - covered - insulated - stranded - cable(All of the above)
Insulation resistance
Plastic - Rubber - Friction(all of the above)

48. 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
Potential difference
Parallel
5%
75 Ohms

49. What do transducers do in electrical terms?
Use an effect to produce another effect
Volts
Does not move
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

50. What types of protective tapes are used?
Symbol
Does not move
Plastic - Rubber - Friction(all of the above)
20%