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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 needed for electric heating elements and the filaments of light bulbs?
Gauge number
Relationship between current and potential difference
Bonding and grounding
High resistance

2. What do junction boxes protect?
Ability to store an electric charge
Wire splices
Current flows in one direction - potential differences across a load does not change(Both A and B)
Tolerence

3. What does a moving charge produce?
Insulation resistance
A magnetic field
--^V^V^V^---
Moving vehicles

4. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Grounding wire
20%
Opposition to electrical current
10%

5. What is the purpose of resistors in electrical circuits?
Produce heat - light - or limit current to control it(all of the above)
Opposition to movement of free electrons
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Insulation resistance

6. How many kinds of poles do magnets have?
The relationship of potential difference to current
Battery
Produce heat - light - or limit current to control it(all of the above)
Two

7. What information do the Left-Hand Rules provide?
Insulation resistance and Dielectric strength(Both A and B)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Electrical resistance against the flow of current
Potential difference

8. What does a third band of brown mean?
High resistance
10
DC current
American wire gauge(AWG)

9. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
--^V^V^V^---
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Parallel
Moving vehicles

10. Which of the following is a type of resistor?
Use an effect to produce another effect
Fixed - tapped - variable(all of the above)
Potential difference
Relationship between current and potential difference

11. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Volts
5%

12. What is a common form used in conductors?
Cables
Tolerence
Serial
Potential difference

13. What is the measure of potential difference?
Cell
Wire splices
Volts
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

14. What is a conductor?
How much potential difference can a material withstand before breaking down
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Choke
Solenoid and Relay(both A and B)

15. What are the common units of measurement for round and square conductor cross - sections?
Circular and square mills(Both A and B)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Stores electrical charge
Opposes any change in the current flowing in a circuit

16. What is the fundamental property of insulators?
Insulation resistance and Dielectric strength(Both A and B)
10
High resistance
Electromagnetic field

17. What cannot be transformed to higher or lower potential differences?
Ability to store an electric charge
DC current
Heat
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

18. What determines the resistance of a resistor?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Stores electrical charge
Composition of the resistor
50 Ohms

19. What is true about a dry cell?
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)
Common - not rechargable - gradually discharges when in storage(All of the above)
1 watt
Relay

20. What is a type of capacitor?
Battery
Breakdown voltage
Symbol
Fixed - Electrolytic - Variable(all of the above)

21. What is a common cause of static electricity in a shop?
A magnetic field
Moving vehicles
Tolerence
The rate of doing work

22. What is the difference between AC and DC?
Fixed - tapped - variable(all of the above)
Tolerence
Purging
DC flows continuously in one direction and AC potential difference and current both change direction

23. A resistor is color coded brown - green - orange. What is its resistance?
First digit is 9
DC flows continuously in one direction and AC potential difference and current both change direction
Stranded
15 -000 ohms - 20%

24. What are the names of two of the six primary methods of producing a voltage?
Ability to store an electric charge
Volts
Heat
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

25. What is voltage?
Does not move
Electromagnetism
A difference in potential energy
Cell

26. What is the name for electrical resistance of insulation?
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)
Gauge number
--^V^V^V^---

27. What does a transformer transform?
The relationship of potential difference to current
Fixed - Electrolytic - Variable(all of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
How much potential difference can a material withstand before breaking down

28. What is the relationship of conductor size and length to resistance?
Resistance increases as the conductor length increases
Fixed - tapped - variable(all of the above)
20%
Heat

29. What does resistance produce?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Solenoid and Relay(both A and B)
Cables
Heat

30. What wire measurement is commonly used in the U.S.?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Ohms
American wire gauge(AWG)
Current flows in one direction - potential differences across a load does not change(Both A and B)

31. What does static electricity do?
A magnetic field
Does not move
Symbol
Magnetic properties

32. What type of circuit has two or more paths for current to follow?
Parallel circuit
Purging
Use an effect to produce another effect
Choke

33. What do we call the ability to do work?
Breakdown voltage
Volts
How much potential difference can a material withstand before breaking down
Energy

34. What is induction?
Electromagnetic field
Plastic - Rubber - Friction(all of the above)
Current change in a coil creates a magnetic change
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)

35. Identify the blueprint symbol for capacitors.
A magnetic field
Symbol
Battery
Bare - covered - insulated - stranded - cable(All of the above)

36. What is the unit of measurement of electrical current?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Fixed - tapped - variable(all of the above)
Amperes
The relationship of potential difference to current

37. What determines whether a spark can be produced?
A magnetic field
Strength of the charge
Resistance increases as the conductor length increases
Current change in a coil creates a magnetic change

38. To what measurement do the conductor mills refer?
Electromagnetism
Use an effect to produce another effect
1/1000th of an inch
Potential difference

39. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
High resistance
--^V^V^V^---
Voltage
Opposition to movement of free electrons

40. What does Ohm's Law represent?
Relationship between current and potential difference
Symbol
Porcelain
Wire splices

41. What is insulation resistance?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Electrical resistance against the flow of current
By their covering
American wire gauge(AWG)

42. The generator is what method of creating potential energy?
A difference in potential energy
Amperes
Electromagnetism
Use an effect to produce another effect

43. What is the unit of measurement of resistance?
Cell
Grounding wire
Chemical action
Ohms

44. What does a first band of white mean?
Current flows in one direction - potential differences across a load does not change(Both A and B)
First digit is 9
Stranded
A magnetic field

45. What is the relationship between cells and batteries?
Relationship between current and potential difference
12 volts
Cells can be connected together to make a battery
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

46. When reading resistance color codes - what does the first band indicate?
First digit
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
12 volts
Solenoid and Relay(both A and B)

47. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Serial
Wire splices
Stores electrical charge
The direction of the magnetic field

48. What is the unit of measurement of potential difference?
First digit
Series circuit
Ohms
Volts

49. How is the heat production measured in a resistor?
Ohms
A difference in potential energy
Potential difference - E*I - current times current change from point to point(all of the above)
Current change in a coil creates a magnetic change

50. When reading resistance color codes - what does the fourth band indicate?
Potential difference
Tolerence
American wire gauge(AWG)
Magnetic properties