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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. How many kinds of poles do magnets have?
Stores electrical charge
Fixed - Electrolytic - Variable(all of the above)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Two

2. What is true about a dry cell?
DC flows continuously in one direction and AC potential difference and current both change direction
Common - not rechargable - gradually discharges when in storage(All of the above)
Heat and current control(both a and c)
Plastic - Rubber - Friction(all of the above)

3. What is a conductor?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
From the negative battery terminal to the positive terminal
Voltmeter
American wire gauge(AWG)

4. What is a switch that operates by electricity?
Relay
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Relationship between current and potential difference
Two

5. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Grounding wire
Solenoid and Relay(both A and B)
The direction the negative charge moves

6. The dry cell is what method for creating potential energy?
Mutual induction
Chemical action
The relationship of potential difference to current
Use an effect to produce another effect

7. 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
75 Ohms
Porcelain
By their covering
--^V^V^V^---

8. What is the measure of potential difference?
Grounding wire
Purging
Volts
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

9. What does a moving charge produce?
Resistance value can not be changed
How much potential difference can a material withstand before breaking down
A magnetic field
Voltage

10. What results when current is run through a material with high resistance?
Amperes
Current change in a coil creates a magnetic change
Heat and current control(both a and c)
Area and spacing of capacitor - static current in the capacitor(both A and B)

11. How do you read resistor color codes?
Tolerence
1/1000th of an inch
Start with the band on the end and read to the center
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)

12. What do transducers do in electrical terms?
1 watt
Does not move
Composition of the resistor
Use an effect to produce another effect

13. What do electrical charges need to cause a fire or explosion?
Electromagnetic field
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Series circuit
Area and spacing of capacitor - static current in the capacitor(both A and B)

14. Why is the transformer important to AC electricity?

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15. What is a common form used in conductors?
Secondary cell
Purging
Silver
Cables

16. Which of the following materials is NOT a good conductor?
Porcelain
Volts
Two
Chemical action

17. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Battery
Produce heat - light - or limit current to control it(all of the above)
A difference in potential energy
Alternating current

18. What is the relationship of conductor size and length to resistance?
Resistance increases as the conductor length increases
Porcelain
Electromagnetism
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

19. What do we call the ability to do work?
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)
Silver
The rate of doing work
Energy

20. What are the names of two of the six primary methods of producing a voltage?
Gauge number
Volts
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
The direction the negative charge moves

21. Where do the fingers point in both Left-Hand Rules?
Porcelain
First digit
The direction of the magnetic field
Potential difference

22. What is insulation resistance?
Cells can be connected together to make a battery
15 -000 ohms - 20%
Electrical resistance against the flow of current
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

23. What is resistance in electrical terms?
Fixed - Electrolytic - Variable(all of the above)
Unlike poles attract
Magnetic properties
Opposition to electrical current

24. Which material has the lowest resistance at ordinary temperatures?
Does not move
Silver
Heat and current control(both a and c)
Opposes any change in the current flowing in a circuit

25. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
5%
Alternating current
Choke
Ability to store an electric charge

26. What types of protective tapes are used?
Opposition to electrical current
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)
Plastic - Rubber - Friction(all of the above)
Potential difference

27. What is dielectric strength?
Grounding wire
How much potential difference can a material withstand before breaking down
Amperes
10%

28. 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
Serial
15 -000 ohms - 20%
12 volts
Bonding and grounding

29. What makes electrons flow?
50 Ohms
Opposes any change in the current flowing in a circuit
A difference in potential energy
Potential difference

30. What is another name for an inductor?
Choke
The relationship of potential difference to current
The direction the negative charge moves
First digit

31. What is induction?
Potential difference
Current change in a coil creates a magnetic change
A magnetic field
Solenoid and Relay(both A and B)

32. What is a wire classification?
Bare - covered - insulated - stranded - cable(All of the above)
High resistance
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Symbol

33. What is a common cause of static electricity in a shop?
Current flows in one direction - potential differences across a load does not change(Both A and B)
The relationship of potential difference to current
Moving vehicles
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)

34. What is a characteristic of insulators?
Battery
Electrical resistance against the flow of current
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Start with the band on the end and read to the center

35. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
50 Ohms
Mutual induction
Symbol
Bare - covered - insulated - stranded - cable(All of the above)

36. What is power?
First digit is 9
The rate of doing work
Series circuit
Cables

37. What does Ohm's Law represent?
Energy
Relationship between current and potential difference
A difference in potential energy
Opposition to movement of free electrons

38. Identify the general blueprint symbol for inductors.
Symbol
DC flows continuously in one direction and AC potential difference and current both change direction
Series circuit
10

39. What is the unit of measurement of potential difference?
Resistance value can not be changed
Volts
75 Ohms
Stores electrical charge

40. What are the two generic methods to eliminate static electricity from metal objects?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
A difference in potential energy
Bonding and grounding
12 volts

41. What is the purpose of a raceway?
75 Ohms
Volts
From the negative battery terminal to the positive terminal
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

42. What is the purpose of capacitors in electrical circuits?
Stores electrical charge
Energy
Produce heat - light - or limit current to control it(all of the above)
Magnetic properties

43. What determines whether a spark can be produced?
Strength of the charge
Insulation resistance
DC flows continuously in one direction and AC potential difference and current both change direction
Circular and square mills(Both A and B)

44. What wire measurement is commonly used in the U.S.?
American wire gauge(AWG)
Wire splices
Electrical resistance against the flow of current
50 Ohms

45. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
Heat
1 watt
Alternating current

46. The generator is what method of creating potential energy?
Cell
Stores electrical charge
Electromagnetism
Area and spacing of capacitor - static current in the capacitor(both A and B)

47. What is the fundamental property of insulators?
Insulation resistance and Dielectric strength(Both A and B)
Resistance value can not be changed
Mutual induction
Composition of the resistor

48. What is the relationship between cells and batteries?
From the negative battery terminal to the positive terminal
Cells can be connected together to make a battery
Potential difference - E*I - current times current change from point to point(all of the above)
The rate of doing work

49. Which of the following is a type of resistor?
Use an effect to produce another effect
Composition of the resistor
Parallel
Fixed - tapped - variable(all of the above)

50. What does a third band of brown mean?
Heat
10
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Opposition to electrical current