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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 a wire classification?
Bare - covered - insulated - stranded - cable(All of the above)
Amperes
Resistance increases as the conductor length increases
Opposition to electrical current

2. What does a first band of white mean?
First digit is 9
By their covering
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
--^V^V^V^---

3. What is a way to classify wires and cables?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Gauge number
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
By their covering

4. What is the relationship between magnetism and electricity?
Does not move
20%
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)
From the negative battery terminal to the positive terminal

5. What is a switch that operates by electricity?
Cables
Insulation resistance and Dielectric strength(Both A and B)
Relay
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

6. What is the use of the electromagnet?
Moving vehicles
Volts
Series circuit
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

7. How many kinds of poles do magnets have?
Volts
Area and spacing of capacitor - static current in the capacitor(both A and B)
Two
Moving vehicles

8. Which of the following is a type of resistor?
The rate of doing work
Cell
10%
Fixed - tapped - variable(all of the above)

9. What is capacitance in electrical terms?
Purging
Alternating current
Parallel
Ability to store an electric charge

10. Identify the general blueprint symbol for inductors.
12 volts
Bare - covered - insulated - stranded - cable(All of the above)
Symbol
Potential difference

11. What must be large enough to carry the largest current likely to occur?
10%
--^V^V^V^---
Porcelain
Grounding wire

12. What is a common form used in conductors?
Cables
The relationship of potential difference to current
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
1/1000th of an inch

13. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
5%
20%
Resistance increases as the conductor length increases
Stores electrical charge

14. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
First digit
Ability to store an electric charge
Alternating current
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

15. How is capacitance determined?
Moving vehicles
Current flows in one direction - potential differences across a load does not change(Both A and B)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Volts

16. What is dielectric strength?
Insulation resistance
How much potential difference can a material withstand before breaking down
Current change in a coil creates a magnetic change
A difference in potential energy

17. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Electrical resistance against the flow of current
The direction the negative charge moves

18. What determines the resistance of a resistor?
Stores electrical charge
Composition of the resistor
Battery
Mutual induction

19. What do electrical charges need to cause a fire or explosion?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
10
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

20. Why is the transformer important to AC electricity?

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21. What is a rigid metal conduit?
Unlike poles attract
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
First digit
A difference in potential energy

22. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Resistance value can not be changed
75 Ohms
50 Ohms
Battery

23. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
A difference in potential energy
Voltage
The relationship of potential difference to current
Circular and square mills(Both A and B)

24. What does an object have if a magnetic field acts on it?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Energy
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Magnetic properties

25. What type of circuit has one path of follow through a load?
Ohms
Symbol
Amperes
Series circuit

26. What determines whether a spark can be produced?
5%
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Strength of the charge
Purging

27. What is a characteristic of insulators?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Choke
--^V^V^V^---
A magnetic field

28. What is a property of inductors in electrical circuits?
Electromagnetism
Gauge number
Use an effect to produce another effect
Opposes any change in the current flowing in a circuit

29. Which type of cell can be recharged?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Secondary cell
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Grounding wire

30. How do static charges distribute themselves?
Bonding and grounding
Magnetic properties
Fixed - tapped - variable(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

31. What is a common measure of wire diameter?
Purging
Resistance value can not be changed
Volts
Gauge number

32. What does a moving charge produce?
A magnetic field
Silver
Ohms
Stranded

33. To what measurement do the conductor mills refer?
The direction the negative charge moves
Insulation resistance and Dielectric strength(Both A and B)
Produce heat - light - or limit current to control it(all of the above)
1/1000th of an inch

34. What is resistance in electrical terms?
Opposition to electrical current
Potential difference
Bare - covered - insulated - stranded - cable(All of the above)
Serial

35. What is the purpose of capacitors in electrical circuits?
Stores electrical charge
Cell
The relationship of potential difference to current
Plastic - Rubber - Friction(all of the above)

36. What makes electrons flow?
Current flows in one direction - potential differences across a load does not change(Both A and B)
From the negative battery terminal to the positive terminal
Potential difference
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)

37. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Two
Fixed - Electrolytic - Variable(all of the above)
Composition of the resistor

38. A resistor is color coded brown - green - orange. What is its resistance?
High resistance
The relationship of potential difference to current
15 -000 ohms - 20%
Unlike poles attract

39. How do you read resistor color codes?
Heat and current control(both a and c)
Start with the band on the end and read to the center
1/1000th of an inch
Resistance value can not be changed

40. What is the unit of measurement of electrical current?
Electromagnetic field
Amperes
Secondary cell
Current change in a coil creates a magnetic change

41. What is a type of capacitor?
Area and spacing of capacitor - static current in the capacitor(both A and B)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Mutual induction
Fixed - Electrolytic - Variable(all of the above)

42. What is the fundamental property of insulators?
Insulation resistance and Dielectric strength(Both A and B)
Choke
Plastic - Rubber - Friction(all of the above)
Secondary cell

43. 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
75 Ohms
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Potential difference
Parallel

44. What is the unit of measurement of potential difference?
From the negative battery terminal to the positive terminal
Electrical resistance against the flow of current
Volts
Symbol

45. What information do the Left-Hand Rules provide?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Opposition to electrical current
Bare - covered - insulated - stranded - cable(All of the above)

46. Which material has the lowest resistance at ordinary temperatures?
A difference in potential energy
American wire gauge(AWG)
Silver
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

47. What does a third band of brown mean?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Stores electrical charge
10
Start with the band on the end and read to the center

48. What is the purpose of resistors in electrical circuits?
Produce heat - light - or limit current to control it(all of the above)
First digit is 9
Strength of the charge
Electromagnetism

49. What is a DC circuit characteristic?
12 volts
Current flows in one direction - potential differences across a load does not change(Both A and B)
Insulation resistance
Two

50. What results when current is run through a material with high resistance?
Breakdown voltage
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Opposes any change in the current flowing in a circuit
Heat and current control(both a and c)