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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 'difference in potential(potential difference) - per unit of charge - between two points'?
High resistance
First digit is 9
Battery
Voltage

2. What does a transformer transform?
The relationship of potential difference to current
Purging
Cables
Choke

3. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Volts
Volts
Insulation resistance and Dielectric strength(Both A and B)
20%

4. What makes electrons flow?
Gauge number
The direction the negative charge moves
Potential difference
Electrical resistance against the flow of current

5. What is the type of cable composed of many fine wires?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Stranded
Secondary cell
Ability to store an electric charge

6. What is the basic law of magnetic force?
Strength of the charge
10%
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Unlike poles attract

7. What do junction boxes protect?
Wire splices
Battery
Voltmeter
1/1000th of an inch

8. What cannot be transformed to higher or lower potential differences?
First digit
Silver
DC current
American wire gauge(AWG)

9. Which type of cell can be recharged?
Cells can be connected together to make a battery
Secondary cell
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Mutual induction

10. What is a DC circuit characteristic?
20%
Current flows in one direction - potential differences across a load does not change(Both A and B)
Two
Electromagnetic field

11. What types of protective tapes are used?
Symbol
Plastic - Rubber - Friction(all of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Composition of the resistor

12. What is an electromagnet?
Strength of the charge
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Cells can be connected together to make a battery
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

13. What is the term for doing work at the rate of joule per second?
1 watt
Chemical action
Potential difference
Insulation resistance

14. What is the relationship of conductor size and length to resistance?
Cables
From the negative battery terminal to the positive terminal
Stores electrical charge
Resistance increases as the conductor length increases

15. When reading resistance color codes - what does the fourth band indicate?
Solenoid and Relay(both A and B)
Bare - covered - insulated - stranded - cable(All of the above)
Plastic - Rubber - Friction(all of the above)
Tolerence

16. What wire measurement is commonly used in the U.S.?
American wire gauge(AWG)
Heat and current control(both a and c)
Purging
The direction of the magnetic field

17. What instrument measures voltage?
Composition of the resistor
Voltmeter
Opposition to movement of free electrons
Plastic - Rubber - Friction(all of the above)

18. What determines whether a spark can be produced?
American wire gauge(AWG)
Solenoid and Relay(both A and B)
Strength of the charge
Does not move

19. How do static charges distribute themselves?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
1/1000th of an inch
The rate of doing work
Symbol

20. What is resistance?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Electromagnetism
Opposition to movement of free electrons
Produce heat - light - or limit current to control it(all of the above)

21. What is the unit of measurement of resistance?
Ohms
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)
Fixed - Electrolytic - Variable(all of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)

22. What is power?
Parallel
75 Ohms
The rate of doing work
Bare - covered - insulated - stranded - cable(All of the above)

23. What is another name for an inductor?
Magnetic properties
Stores electrical charge
By their covering
Choke

24. In most applications - what remains constant if the current remains constant and flows in one direction?
Breakdown voltage
Electromagnetic field
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Circular and square mills(Both A and B)

25. What does an object have if a magnetic field acts on it?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Magnetic properties
Cell

26. What are the names of two of the six primary methods of producing a voltage?
Parallel
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Mutual induction
Opposition to movement of free electrons

27. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Resistance value can not be changed
Heat
Serial
From the negative battery terminal to the positive terminal

28. What is the difference between AC and DC?
12 volts
Current flows in one direction - potential differences across a load does not change(Both A and B)
Porcelain
DC flows continuously in one direction and AC potential difference and current both change direction

29. What is a type of capacitor?
Insulation resistance
5%
Volts
Fixed - Electrolytic - Variable(all of the above)

30. What does a first band of white mean?
Series circuit
Heat and current control(both a and c)
First digit is 9
Composition of the resistor

31. What is a wire classification?
Bare - covered - insulated - stranded - cable(All of the above)
The direction of the magnetic field
Tolerence
10%

32. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
50 Ohms
Resistance increases as the conductor length increases
Bonding and grounding
Composition of the resistor

33. What is a common form used in conductors?
Cables
Produce heat - light - or limit current to control it(all of the above)
Opposition to electrical current
DC flows continuously in one direction and AC potential difference and current both change direction

34. What is the purpose of resistors in electrical circuits?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Stranded
Produce heat - light - or limit current to control it(all of the above)
12 volts

35. What do electrical charges need to cause a fire or explosion?
Symbol
Relationship between current and potential difference
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Opposes any change in the current flowing in a circuit

36. A resistor is color coded brown - green - orange. What is its resistance?
Insulation resistance
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Parallel circuit
15 -000 ohms - 20%

37. What does Ohm's Law represent?
--^V^V^V^---
1 watt
Two
Relationship between current and potential difference

38. What is insulation resistance?
1/1000th of an inch
Electrical resistance against the flow of current
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Grounding wire

39. What is needed for electric heating elements and the filaments of light bulbs?
Unlike poles attract
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Insulation resistance
High resistance

40. Identify the blueprint symbol for capacitors.
Resistance increases as the conductor length increases
American wire gauge(AWG)
Symbol
Composition of the resistor

41. What is the name for electrical resistance of insulation?
Insulation resistance
By their covering
Stranded
10

42. Which of the following is a type of resistor?
Potential difference
Two
Fixed - tapped - variable(all of the above)
Stranded

43. How do you read resistor color codes?
Serial
12 volts
DC current
Start with the band on the end and read to the center

44. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Fixed - Electrolytic - Variable(all of the above)
Secondary cell
Resistance value can not be changed
Purging

45. What is an arrangement of materials that create a potential difference by chemistry?
10%
Cell
--^V^V^V^---
A magnetic field

46. What does a moving charge produce?
Stranded
Relationship between current and potential difference
A magnetic field
Resistance increases as the conductor length increases

47. Identify the general blueprint symbol for inductors.
Volts
Stranded
Cables
Symbol

48. What can permanently break down a capacitor?
Voltage
The direction of the magnetic field
Breakdown voltage
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

49. What is a type of mechanical transducer?
Bare - covered - insulated - stranded - cable(All of the above)
Insulation resistance and Dielectric strength(Both A and B)
Solenoid and Relay(both A and B)
Voltage

50. What is the relationship between cells and batteries?
Cells can be connected together to make a battery
50 Ohms
Insulation resistance and Dielectric strength(Both A and B)
15 -000 ohms - 20%