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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 does a third band of brown mean?
DC flows continuously in one direction and AC potential difference and current both change direction
Tolerence
10
Unlike poles attract

2. What is the measure of potential difference?
Volts
1/1000th of an inch
First digit is 9
American wire gauge(AWG)

3. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
50 Ohms
Potential difference - E*I - current times current change from point to point(all of the above)
75 Ohms

4. What is the term for two or more cells attached together?
Battery
First digit
Voltmeter
Electromagnetism

5. How is capacitance determined?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Porcelain
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

6. What does a transformer transform?
The relationship of potential difference to current
Stores electrical charge
Amperes
Heat

7. What can permanently break down a capacitor?
How much potential difference can a material withstand before breaking down
Does not move
American wire gauge(AWG)
Breakdown voltage

8. What is induction?
Cables
--^V^V^V^---
Current change in a coil creates a magnetic change
Common - not rechargable - gradually discharges when in storage(All of the above)

9. What are the common units of measurement for round and square conductor cross - sections?
Opposes any change in the current flowing in a circuit
Circular and square mills(Both A and B)
Opposition to electrical current
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

10. The generator is what method of creating potential energy?
Current change in a coil creates a magnetic change
Secondary cell
Serial
Electromagnetism

11. What is the term for doing work at the rate of joule per second?
1 watt
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Current change in a coil creates a magnetic change

12. What determines the resistance of a resistor?
By their covering
Secondary cell
Composition of the resistor
Resistance increases as the conductor length increases

13. Which of the following materials is NOT a good conductor?
Electromagnetism
Grounding wire
Porcelain
Series circuit

14. What results when current is run through a material with high resistance?
Volts
A magnetic field
Electromagnetism
Heat and current control(both a and c)

15. What is the unit of measurement of potential difference?
Purging
Current change in a coil creates a magnetic change
Volts
Insulation resistance

16. What wire measurement is commonly used in the U.S.?
American wire gauge(AWG)
Circular and square mills(Both A and B)
The relationship of potential difference to current
Solenoid and Relay(both A and B)

17. What is the unit of measurement of electrical current?
Stores electrical charge
DC current
Amperes
The relationship of potential difference to current

18. What is the purpose of a raceway?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Stores electrical charge
High resistance
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

19. Which material has the lowest resistance at ordinary temperatures?
Bare - covered - insulated - stranded - cable(All of the above)
Silver
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Does not move

20. What is a characteristic of insulators?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Silver
75 Ohms

21. What is a DC circuit characteristic?
10%
Current flows in one direction - potential differences across a load does not change(Both A and B)
Electrical resistance against the flow of current
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

22. What is the relationship between cells and batteries?
Heat
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Cells can be connected together to make a battery
Opposition to movement of free electrons

23. What is the use of the electromagnet?
Purging
Current change in a coil creates a magnetic change
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Parallel

24. What is a wire classification?
Bare - covered - insulated - stranded - cable(All of the above)
Amperes
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

25. What is a conductor?
1/1000th of an inch
Common - not rechargable - gradually discharges when in storage(All of the above)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
How much potential difference can a material withstand before breaking down

26. What is the unit of measurement of resistance?
DC flows continuously in one direction and AC potential difference and current both change direction
5%
Ohms
Resistance increases as the conductor length increases

27. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Serial
Stranded
Start with the band on the end and read to the center
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

28. What instrument measures voltage?
Resistance increases as the conductor length increases
Voltmeter
Composition of the resistor
A magnetic field

29. What is an arrangement of materials that create a potential difference by chemistry?
Cell
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
12 volts
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)

30. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Porcelain
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Parallel

31. Identify the blueprint symbol for resistors.
By their covering
--^V^V^V^---
Alternating current
American wire gauge(AWG)

32. What does static electricity do?
Opposes any change in the current flowing in a circuit
Unlike poles attract
Potential difference
Does not move

33. What is voltage?
The rate of doing work
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Breakdown voltage
A difference in potential energy

34. When reading resistance color codes - what does the first band indicate?
First digit
High 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)
Potential difference - E*I - current times current change from point to point(all of the above)

35. In most applications - what remains constant if the current remains constant and flows in one direction?
Electromagnetic field
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
10
15 -000 ohms - 20%

36. What do transducers do in electrical terms?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Strength of the charge
Use an effect to produce another effect
Symbol

37. The thermocouple uses which method for creating potential energy?
Relationship between current and potential difference
Heat
20%
How much potential difference can a material withstand before breaking down

38. How many kinds of poles do magnets have?
Two
Heat
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Breakdown voltage

39. What information do the Left-Hand Rules provide?
Current flows in one direction - potential differences across a load does not change(Both A and B)
American wire gauge(AWG)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Heat

40. What does a moving charge produce?
The direction the negative charge moves
A magnetic field
Volts
Plastic - Rubber - Friction(all of the above)

41. Where do the fingers point in both Left-Hand Rules?
Strength of the charge
Symbol
The direction of the magnetic field
Insulation resistance and Dielectric strength(Both A and B)

42. What is the type of cable composed of many fine wires?
Series circuit
Mutual induction
Symbol
Stranded

43. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
15 -000 ohms - 20%
Purging
Mutual induction
Chemical action

44. What is a common cause of static electricity in a shop?
Moving vehicles
Cell
Opposition to movement of free electrons
The rate of doing work

45. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Voltage
1 watt
Start with the band on the end and read to the center

46. What is insulation resistance?
Electrical resistance against the flow of current
75 Ohms
10
Insulation resistance and Dielectric strength(Both A and B)

47. How do you read resistor color codes?
Porcelain
Does not move
Start with the band on the end and read to the center
Choke

48. What is the basic law of magnetic force?
Symbol
The direction of the magnetic field
Area and spacing of capacitor - static current in the capacitor(both A and B)
Unlike poles attract

49. 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
Bonding and grounding
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
12 volts
20%

50. What is another name for an inductor?
Solenoid and Relay(both A and B)
10%
Choke
Current flows in one direction - potential differences across a load does not change(Both A and B)