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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 determines whether a spark can be produced?
Strength of the charge
Solenoid and Relay(both A and B)
The rate of doing work
Opposes any change in the current flowing in a circuit

2. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Magnetic properties
Ability to store an electric charge
Porcelain

3. Which material has the lowest resistance at ordinary temperatures?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Heat and current control(both a and c)
Potential difference
Silver

4. Identify the blueprint symbol for resistors.
Volts
Insulation resistance and Dielectric strength(Both A and B)
Voltage
--^V^V^V^---

5. What is a wire classification?
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)
50 Ohms
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)
Bare - covered - insulated - stranded - cable(All of the above)

6. What is the purpose of a raceway?
Composition of the resistor
Grounding wire
10%
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

7. Which of the following is a type of resistor?
Electromagnetic field
Fixed - tapped - variable(all of the above)
Choke
Circular and square mills(Both A and B)

8. What are the common units of measurement for round and square conductor cross - sections?
Common - not rechargable - gradually discharges when in storage(All of the above)
Voltage
Volts
Circular and square mills(Both A and B)

9. What is a characteristic of a fixed resistor?
How much potential difference can a material withstand before breaking down
Resistance value can not be changed
1/1000th of an inch
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

10. What is power?
Symbol
Ability to store an electric charge
Start with the band on the end and read to the center
The rate of doing work

11. What is needed for electric heating elements and the filaments of light bulbs?
Choke
High resistance
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Strength of the charge

12. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Insulation resistance and Dielectric strength(Both A and B)
Magnetic properties
20%
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

13. How do you read resistor color codes?
Unlike poles attract
How much potential difference can a material withstand before breaking down
Start with the band on the end and read to the center
A difference in potential energy

14. What is the use of the electromagnet?
5%
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Ability to store an electric charge
Tolerence

15. When reading resistance color codes - what does the first band indicate?
First digit
Heat and current control(both a and c)
10
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

16. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Grounding wire
Alternating current
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

17. What is the purpose of resistors in electrical circuits?
Ohms
Produce heat - light - or limit current to control it(all of the above)
1 watt
Strength of the charge

18. Which type of cell can be recharged?
Secondary cell
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Gauge number
Symbol

19. How is capacitance determined?
Opposition to movement of free electrons
Amperes
Area and spacing of capacitor - static current in the capacitor(both A and B)
Magnetic properties

20. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
By their covering
50 Ohms
Mutual induction
Magnetic properties

21. What type of circuit has one path of follow through a load?
Series circuit
Resistance increases as the conductor length increases
Does not move
Secondary cell

22. What is another name for an inductor?
Gauge number
Cells can be connected together to make a battery
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Choke

23. What is a property of inductors in electrical circuits?
Produce heat - light - or limit current to control it(all of the above)
Chemical action
Opposes any change in the current flowing in a circuit
Symbol

24. Where do the fingers point in both Left-Hand Rules?
Does not move
The direction of the magnetic field
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Parallel circuit

25. What is the measure of potential difference?
Porcelain
Silver
Volts
Moving vehicles

26. What does a first band of white mean?
Opposition to electrical current
Heat
Electromagnetic field
First digit is 9

27. What types of protective tapes are used?
Plastic - Rubber - Friction(all of the above)
Produce heat - light - or limit current to control it(all of the above)
Composition of the resistor
Voltmeter

28. The generator is what method of creating potential energy?
Electromagnetism
Alternating current
Moving vehicles
Parallel

29. In most applications - what remains constant if the current remains constant and flows in one direction?
Stores electrical charge
Series circuit
Electromagnetic field
Electrical resistance against the flow of current

30. What determines the resistance of a resistor?
Chemical action
Opposition to electrical current
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Composition of the resistor

31. Which way is the current going in the circuit shown?(electron flow)
Amperes
From the negative battery terminal to the positive terminal
Potential difference
Current change in a coil creates a magnetic change

32. What is an arrangement of materials that create a potential difference by chemistry?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Stores electrical charge
Cell
Wire splices

33. When reading resistance color codes - what does the fourth band indicate?
Tolerence
20%
--^V^V^V^---
High resistance

34. What is the basic law of magnetic force?
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)
Unlike poles attract
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
The direction of the magnetic field

35. What is resistance?
Fixed - tapped - variable(all of the above)
Stranded
Opposition to movement of free electrons
Volts

36. What is the relationship of conductor size and length to resistance?
Resistance increases as the conductor length increases
Opposes any change in the current flowing in a circuit
Opposition to movement of free electrons
Produce heat - light - or limit current to control it(all of the above)

37. What does Ohm's Law represent?
Relationship between current and potential difference
Electromagnetism
20%
Potential difference - E*I - current times current change from point to point(all of the above)

38. What is a way to classify wires and cables?
Gauge number
Cell
By their covering
Relationship between current and potential difference

39. What is capacitance in electrical terms?
DC flows continuously in one direction and AC potential difference and current both change direction
Ability to store an electric charge
Electrical resistance against the flow of current
Heat and current control(both a and c)

40. What is a rigid metal conduit?
10
Resistance increases as the conductor length increases
Opposes any change in the current flowing in a circuit
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

41. What is the fundamental property of insulators?
Alternating current
Insulation resistance and Dielectric strength(Both A and B)
50 Ohms
Grounding wire

42. What is the purpose of capacitors in electrical circuits?
From the negative battery terminal to the positive terminal
DC current
10%
Stores electrical charge

43. What is the name for electrical resistance of insulation?
Opposes any change in the current flowing in a circuit
Insulation resistance
Gauge number
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

44. What cannot be transformed to higher or lower potential differences?
Electrical resistance against the flow of current
Unlike poles attract
Volts
DC current

45. What must be large enough to carry the largest current likely to occur?
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)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Grounding wire
Heat

46. What does a third band of brown mean?
Composition of the resistor
10
15 -000 ohms - 20%
50 Ohms

47. Why is the transformer important to AC electricity?

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48. What information do the Left-Hand Rules provide?
Moving vehicles
DC current
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

49. What is a switch that operates by electricity?
Relay
Silver
Breakdown voltage
Resistance increases as the conductor length increases

50. How do static charges distribute themselves?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
50 Ohms
Current change in a coil creates a magnetic change
Electrical resistance against the flow of current