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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. Which of the following materials is NOT a good conductor?
Current flows in one direction - potential differences across a load does not change(Both A and B)
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)
Porcelain
Composition of the resistor

2. What is a DC circuit characteristic?
Two
Current flows in one direction - potential differences across a load does not change(Both A and B)
Use an effect to produce another effect
--^V^V^V^---

3. What is an electromagnet?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Cables
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Chemical action

4. What does a third band of brown mean?
12 volts
10
Moving vehicles
75 Ohms

5. What does a transformer transform?
Grounding wire
The relationship of potential difference to current
Purging
Secondary cell

6. What do we call the ability to do work?
Potential difference - E*I - current times current change from point to point(all of the above)
DC flows continuously in one direction and AC potential difference and current both change direction
Energy
The rate of doing work

7. What do transducers do in electrical terms?
Heat
Use an effect to produce another effect
Two
Cables

8. In most applications - what remains constant if the current remains constant and flows in one direction?
A magnetic field
Electromagnetic field
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)
Current flows in one direction - potential differences across a load does not change(Both A and B)

9. What must be large enough to carry the largest current likely to occur?
5%
Magnetic properties
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)
Grounding wire

10. What is the purpose of capacitors in electrical circuits?
Stores electrical charge
Symbol
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)
1/1000th of an inch

11. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Energy
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Alternating current
The direction the negative charge moves

12. What is the purpose of a raceway?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Series circuit
Choke
12 volts

13. What are the common units of measurement for round and square conductor cross - sections?
Solenoid and Relay(both A and B)
Current change in a coil creates a magnetic change
Secondary cell
Circular and square mills(Both A and B)

14. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
A magnetic field
The direction the negative charge moves
Resistance value can not be changed

15. What do junction boxes protect?
First digit
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)
Wire splices
10

16. What type of circuit has one path of follow through a load?
Resistance value can not be changed
Potential difference - E*I - current times current change from point to point(all of the above)
Grounding wire
Series circuit

17. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
10%
15 -000 ohms - 20%
Symbol

18. What is a property of inductors in electrical circuits?
Two
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Produce heat - light - or limit current to control it(all of the above)
Opposes any change in the current flowing in a circuit

19. The dry cell is what method for creating potential energy?
Chemical action
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Opposition to movement of free electrons
Cables

20. How is the heat production measured in a resistor?
Potential difference - E*I - current times current change from point to point(all of the above)
Serial
Common - not rechargable - gradually discharges when in storage(All of the above)
Chemical action

21. What makes electrons flow?
The direction the negative charge moves
Circular and square mills(Both A and B)
Potential difference
Potential difference - E*I - current times current change from point to point(all of the above)

22. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
50 Ohms
Grounding wire
Composition of the resistor
Common - not rechargable - gradually discharges when in storage(All of the above)

23. What is the unit of measurement of potential difference?
American wire gauge(AWG)
Heat
Secondary cell
Volts

24. Identify the blueprint symbol for capacitors.
Moving vehicles
The relationship of potential difference to current
Bare - covered - insulated - stranded - cable(All of the above)
Symbol

25. What wire measurement is commonly used in the U.S.?
American wire gauge(AWG)
1/1000th of an inch
Strength of the charge
DC current

26. Which of the following is a type of resistor?
Resistance increases as the conductor length increases
First digit is 9
Fixed - tapped - variable(all of the above)
Insulation resistance

27. What is true about a dry cell?
1 watt
Resistance value can not be changed
Common - not rechargable - gradually discharges when in storage(All of the above)
Resistance increases as the conductor length increases

28. What is the purpose of resistors in electrical circuits?
Produce heat - light - or limit current to control it(all of the above)
The direction of the magnetic field
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)
Opposes any change in the current flowing in a circuit

29. What is induction?
Silver
A difference in potential energy
Wire splices
Current change in a coil creates a magnetic change

30. What is the relationship of conductor size and length to resistance?
Heat and current control(both a and c)
Resistance increases as the conductor length increases
Bonding and grounding
Battery

31. What determines the resistance of a resistor?
Fixed - Electrolytic - Variable(all of the above)
Composition of the resistor
Magnetic properties
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

32. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Unlike poles attract
Purging
Insulation resistance and Dielectric strength(Both A and B)
Parallel

33. What is a common measure of wire diameter?
The direction of the magnetic field
Breakdown voltage
Gauge number
Magnetic properties

34. What is a switch that operates by electricity?
Relay
Grounding wire
Alternating current
A difference in potential energy

35. What are the names of two of the six primary methods of producing a voltage?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Unlike poles attract

36. What does a first band of white mean?
Wire splices
Potential difference
DC flows continuously in one direction and AC potential difference and current both change direction
First digit is 9

37. How do you read resistor color codes?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Silver
Symbol
Start with the band on the end and read to the center

38. What does Ohm's Law represent?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Relationship between current and potential difference
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

39. Identify the general blueprint symbol for inductors.
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)
75 Ohms
Symbol

40. What are the two generic methods to eliminate static electricity from metal objects?
Cells can be connected together to make a battery
Bonding and grounding
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Energy

41. How many kinds of poles do magnets have?
American wire gauge(AWG)
Stores electrical charge
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Two

42. What does a moving charge produce?
10%
Symbol
A magnetic field
DC current

43. When reading resistance color codes - what does the fourth band indicate?
Grounding wire
DC current
Tolerence
Ability to store an electric charge

44. What is the name for electrical resistance of insulation?
Porcelain
Insulation resistance
Voltmeter
Grounding wire

45. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
DC current
Serial
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)
Silver

46. What determines whether a spark can be produced?
Choke
Strength of the charge
Volts
10%

47. What is the fundamental property of insulators?
Insulation resistance and Dielectric strength(Both A and B)
Does not move
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Silver

48. 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
Resistance increases as the conductor length increases
Current flows in one direction - potential differences across a load does not change(Both A and B)
12 volts
Energy

49. What is dielectric strength?
--^V^V^V^---
How much potential difference can a material withstand before breaking down
Series circuit
Voltage

50. What is insulation resistance?
Mutual induction
Alternating current
Electrical resistance against the flow of current
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)