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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 resistors in electrical circuits?
Plastic - Rubber - Friction(all of the above)
From the negative battery terminal to the positive terminal
Produce heat - light - or limit current to control it(all of the above)
Series circuit

2. What does static electricity do?
Does not move
DC flows continuously in one direction and AC potential difference and current both change direction
Stranded
Resistance value can not be changed

3. What is a common cause of static electricity in a shop?
Moving vehicles
Potential difference
Symbol
First digit is 9

4. What is a DC circuit characteristic?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Current flows in one direction - potential differences across a load does not change(Both A and B)
Potential difference
Ohms

5. What is the term for two or more cells attached together?
20%
15 -000 ohms - 20%
How much potential difference can a material withstand before breaking down
Battery

6. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
A magnetic field
Series circuit
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

7. What instrument measures voltage?
Stranded
Heat
Voltmeter
By their covering

8. What must be large enough to carry the largest current likely to occur?
Voltage
Grounding wire
Bonding and grounding
Silver

9. What is insulation resistance?
Energy
Heat and current control(both a and c)
5%
Electrical resistance against the flow of current

10. To what measurement do the conductor mills refer?
1/1000th of an inch
Moving vehicles
Opposes any change in the current flowing in a circuit
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

11. What is an arrangement of materials that create a potential difference by chemistry?
A difference in potential energy
Bare - covered - insulated - stranded - cable(All of the above)
Porcelain
Cell

12. Identify the blueprint symbol for resistors.
The direction of the magnetic field
5%
The direction the negative charge moves
--^V^V^V^---

13. Identify the general blueprint symbol for inductors.
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Symbol
Produce heat - light - or limit current to control it(all of the above)
Chemical action

14. What cannot be transformed to higher or lower potential differences?
DC current
Heat
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Common - not rechargable - gradually discharges when in storage(All of the above)

15. What can permanently break down a capacitor?
Amperes
The relationship of potential difference to current
Breakdown voltage
Fixed - tapped - variable(all of the above)

16. What is a switch that operates by electricity?
Relay
Potential difference
Fixed - tapped - variable(all of the above)
Tolerence

17. The generator is what method of creating potential energy?
A magnetic field
Electromagnetism
Amperes
Current flows in one direction - potential differences across a load does not change(Both A and B)

18. What makes electrons flow?
Potential difference
Start with the band on the end and read to the center
Produce heat - light - or limit current to control it(all of the above)
Opposition to movement of free electrons

19. What determines whether a spark can be produced?
The relationship of potential difference to current
Start with the band on the end and read to the center
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Strength of the charge

20. What do electrical charges need to cause a fire or explosion?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
First digit
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Fixed - tapped - variable(all of the above)

21. Identify the blueprint symbol for capacitors.
DC current
A magnetic field
Symbol
Secondary cell

22. The thermocouple uses which method for creating potential energy?
Electromagnetism
Series circuit
Two
Heat

23. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Mutual induction
Parallel
Start with the band on the end and read to the center
Cells can be connected together to make a battery

24. What type of circuit has two or more paths for current to follow?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Composition of the resistor
Parallel circuit
Two

25. What is an electromagnet?
1/1000th of an inch
Fixed - tapped - variable(all of the above)
Heat and current control(both a and c)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

26. What does a third band of brown mean?
First digit
10
American wire gauge(AWG)
DC flows continuously in one direction and AC potential difference and current both change direction

27. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Energy
20%
Battery

28. What is power?
Series circuit
Ability to store an electric charge
Electromagnetism
The rate of doing work

29. The dry cell is what method for creating potential energy?
20%
Chemical action
Secondary cell
Ohms

30. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
DC current
From the negative battery terminal to the positive terminal
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Purging

31. What makes electrons flow?
Start with the band on the end and read to the center
Cell
DC current
Potential difference

32. What does resistance produce?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Voltmeter
Voltage
Heat

33. What is true about a dry cell?
Parallel circuit
A magnetic field
Common - not rechargable - gradually discharges when in storage(All of the above)
Volts

34. How is the heat production measured in a resistor?
Parallel
Potential difference - E*I - current times current change from point to point(all of the above)
5%
Wire splices

35. Why is the transformer important to AC electricity?

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36. What type of circuit has one path of follow through a load?
Stranded
Series circuit
Potential difference
Common - not rechargable - gradually discharges when in storage(All of the above)

37. How do you read resistor color codes?
Electromagnetism
Start with the band on the end and read to the center
Purging
Cell

38. What is the use of the electromagnet?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Fixed - tapped - variable(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
From the negative battery terminal to the positive terminal

39. What is the unit of measurement of resistance?
Ohms
The direction of the magnetic field
Common - not rechargable - gradually discharges when in storage(All of the above)
Unlike poles attract

40. What is the measure of potential difference?
Alternating current
Volts
American wire gauge(AWG)
The rate of doing work

41. What is the purpose of a raceway?
Composition of the resistor
American wire gauge(AWG)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

42. What is a common measure of wire diameter?
Stores electrical charge
Gauge number
Secondary cell
Electromagnetic field

43. What is a property of inductors in electrical circuits?
DC current
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Opposes any change in the current flowing in a circuit
Ohms

44. What does a first band of white mean?
Parallel circuit
Silver
A magnetic field
First digit is 9

45. What are the common units of measurement for round and square conductor cross - sections?
Circular and square mills(Both A and B)
Amperes
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

46. What is the term for doing work at the rate of joule per second?
Potential difference
1 watt
Electromagnetism
Bare - covered - insulated - stranded - cable(All of the above)

47. Which material has the lowest resistance at ordinary temperatures?
Insulation resistance
Silver
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)
Secondary cell

48. What is a wire classification?
The rate of doing work
Moving vehicles
Bare - covered - insulated - stranded - cable(All of the above)
Fixed - Electrolytic - Variable(all of the above)

49. What is voltage?
Insulation resistance
A difference in potential energy
Start with the band on the end and read to the center
Choke

50. What is the name for electrical resistance of insulation?
Heat
10
5%
Insulation resistance