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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 makes electrons flow?
Resistance value can not be changed
Stores electrical charge
Ohms
Potential difference

2. The dry cell is what method for creating potential energy?
Unlike poles attract
Choke
5%
Chemical action

3. To what measurement do the conductor mills refer?
High resistance
1/1000th of an inch
Cables
The direction of the magnetic field

4. What does a moving charge produce?
15 -000 ohms - 20%
Opposes any change in the current flowing in a circuit
A magnetic field
Wire splices

5. What is the basic law of magnetic force?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Unlike poles attract
The direction the negative charge moves
Potential difference

6. What is a property of inductors in electrical circuits?
The direction the negative charge moves
Ability to store an electric charge
Wire splices
Opposes any change in the current flowing in a circuit

7. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
By their covering
Volts
Stores electrical charge
Voltage

8. What results when current is run through a material with high resistance?
DC flows continuously in one direction and AC potential difference and current both change direction
First digit
Heat and current control(both a and c)
Volts

9. When reading resistance color codes - what does the first band indicate?
Two
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
First digit
Cables

10. What cannot be transformed to higher or lower potential differences?
Fixed - tapped - variable(all of the above)
10%
DC current
Alternating current

11. What is induction?
How much potential difference can a material withstand before breaking down
Symbol
Cell
Current change in a coil creates a magnetic change

12. What is resistance?
Opposition to movement of free electrons
Heat
The direction of the magnetic field
Solenoid and Relay(both A and B)

13. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Tolerence
20%
Current change in a coil creates a magnetic change
Potential difference - E*I - current times current change from point to point(all of the above)

14. What is the name for electrical resistance of insulation?
Symbol
Circular and square mills(Both A and B)
Insulation resistance
Resistance value can not be changed

15. What is the purpose of capacitors in electrical circuits?
Opposition to electrical current
Opposition to movement of free electrons
Stores electrical charge
1 watt

16. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
50 Ohms
Cell
The direction of the magnetic field
Electromagnetism

17. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
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)
Opposition to electrical current

18. In most applications - what remains constant if the current remains constant and flows in one direction?
Electromagnetic field
Grounding wire
--^V^V^V^---
By their covering

19. What does a third band of brown mean?
Voltmeter
Opposes any change in the current flowing in a circuit
10
Solenoid and Relay(both A and B)

20. What must be large enough to carry the largest current likely to occur?
Symbol
High resistance
Grounding wire
Opposes any change in the current flowing in a circuit

21. What information do the Left-Hand Rules provide?
Relationship between current and potential difference
Opposition to electrical current
Opposition to movement of free electrons
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

22. What is a wire classification?
By their covering
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Bare - covered - insulated - stranded - cable(All of the above)
Produce heat - light - or limit current to control it(all of the above)

23. What is a characteristic of insulators?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Alternating current
10
From the negative battery terminal to the positive terminal

24. What is another name for an inductor?
Choke
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
--^V^V^V^---
Potential difference

25. Identify the blueprint symbol for resistors.
--^V^V^V^---
20%
American wire gauge(AWG)
Choke

26. What does resistance produce?
Bare - covered - insulated - stranded - cable(All of the above)
Magnetic properties
1/1000th of an inch
Heat

27. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Potential difference
Parallel circuit
Purging
Bonding and grounding

28. What is power?
Resistance value can not be changed
Use an effect to produce another effect
The rate of doing work
First digit is 9

29. How is capacitance determined?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
The direction the negative charge moves
Area and spacing of capacitor - static current in the capacitor(both A and B)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

30. What can permanently break down a capacitor?
Volts
Fixed - tapped - variable(all of the above)
Cells can be connected together to make a battery
Breakdown voltage

31. What do electrical charges need to cause a fire or explosion?
Circular and square mills(Both A and B)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
First digit is 9

32. What is the use of the electromagnet?
Symbol
The direction the negative charge moves
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)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

33. Why is the transformer important to AC electricity?

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34. What is a DC circuit characteristic?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Circular and square mills(Both A and B)
From the negative battery terminal to the positive terminal
Produce heat - light - or limit current to control it(all of the above)

35. What is a common cause of static electricity in a shop?
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)
Moving vehicles
From the negative battery terminal to the positive terminal

36. Given R=E / I and the following information - plug in the data and solve the problem for resistance. 1.5 volt walkman battery - 0.02 amps of current
Resistance value can not be changed
75 Ohms
12 volts
Stranded

37. What is the measure of potential difference?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Common - not rechargable - gradually discharges when in storage(All of the above)
Volts
By their covering

38. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
5%
High resistance
Alternating current
Electromagnetism

39. What is needed for electric heating elements and the filaments of light bulbs?
50 Ohms
75 Ohms
Tolerence
High resistance

40. What is true about a dry cell?
Solenoid and Relay(both A and B)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Common - not rechargable - gradually discharges when in storage(All of the above)
Heat

41. What is a common measure of wire diameter?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Mutual induction
Ability to store an electric charge
Gauge number

42. What determines whether a spark can be produced?
Silver
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Common - not rechargable - gradually discharges when in storage(All of the above)
Strength of the charge

43. What is capacitance in electrical terms?
Produce heat - light - or limit current to control it(all of the above)
Ability to store an electric charge
Potential difference
Potential difference - E*I - current times current change from point to point(all of the above)

44. How do you read resistor color codes?
Start with the band on the end and read to the center
DC current
How much potential difference can a material withstand before breaking down
Energy

45. How many kinds of poles do magnets have?
Mutual induction
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Two
Potential difference

46. Identify the general blueprint symbol for inductors.
From the negative battery terminal to the positive terminal
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
12 volts
Symbol

47. What does a first band of white mean?
Does not move
Gauge number
First digit is 9
Grounding wire

48. What is a conductor?
Cell
Potential difference
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
1/1000th of an inch

49. When does a DC circuit oppose current flow?
American wire gauge(AWG)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Circular and square mills(Both A and B)

50. What is the unit of measurement of resistance?
Does not move
Volts
Strength of the charge
Ohms