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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. In most applications - what remains constant if the current remains constant and flows in one direction?
Electromagnetic field
Electrical resistance against the flow of current
Use an effect to produce another effect
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

2. What is power?
Electromagnetism
The rate of doing work
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Symbol

3. Why is the transformer important to AC electricity?

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4. What are the names of two of the six primary methods of producing a voltage?
Relay
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
20%
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

5. What is a DC circuit characteristic?
Fixed - Electrolytic - Variable(all of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Potential difference
A difference in potential energy

6. What is the difference between AC and DC?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
From the negative battery terminal to the positive terminal
DC flows continuously in one direction and AC potential difference and current both change direction
10

7. What are the two generic methods to eliminate static electricity from metal objects?
Current change in a coil creates a magnetic change
Bonding and grounding
Breakdown voltage
Symbol

8. What wire measurement is commonly used in the U.S.?
A magnetic field
American wire gauge(AWG)
A difference in potential energy
Insulation resistance and Dielectric strength(Both A and B)

9. What is insulation resistance?
Volts
Moving vehicles
Electrical resistance against the flow of current
Heat and current control(both a and c)

10. What can permanently break down a capacitor?
15 -000 ohms - 20%
Does not move
Breakdown voltage
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

11. When does a DC circuit oppose current flow?
Electrical resistance against the flow of current
Tolerence
Grounding wire
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

12. What determines whether a spark can be produced?
Strength of the charge
Volts
10%
Electromagnetic field

13. Which of the following materials is NOT a good conductor?
Porcelain
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
First digit
Area and spacing of capacitor - static current in the capacitor(both A and B)

14. What is a switch that operates by electricity?
Produce heat - light - or limit current to control it(all of the above)
DC flows continuously in one direction and AC potential difference and current both change direction
Stores electrical charge
Relay

15. What does static electricity do?
Cells can be connected together to make a battery
Stranded
Does not move
Opposition to movement of free electrons

16. What is the relationship between magnetism and electricity?
Heat
Parallel
Composition of the resistor
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)

17. 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
Potential difference
Voltage
12 volts
Cells can be connected together to make a battery

18. What is a rigid metal conduit?
Relationship between current and potential difference
Start with the band on the end and read to the center
12 volts
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

19. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Alternating current
Resistance value can not be changed
Fixed - Electrolytic - Variable(all of the above)

20. Which of the following is a type of resistor?
10
Electrical resistance against the flow of current
Fixed - tapped - variable(all of the above)
Resistance increases as the conductor length increases

21. What type of circuit has two or more paths for current to follow?
Porcelain
Parallel circuit
Moving vehicles
First digit

22. What is a common form used in conductors?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Fixed - tapped - variable(all of the above)
Use an effect to produce another effect
Cables

23. A resistor is color coded brown - green - orange. What is its resistance?
Relationship between current and potential difference
Potential difference
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
15 -000 ohms - 20%

24. The dry cell is what method for creating potential energy?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Chemical action
Resistance value can not be changed
50 Ohms

25. What is needed for electric heating elements and the filaments of light bulbs?
High resistance
Composition of the resistor
How much potential difference can a material withstand before breaking down
Insulation resistance

26. What is the unit of measurement of resistance?
Series circuit
Ohms
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Plastic - Rubber - Friction(all of the above)

27. What is dielectric strength?
Series circuit
20%
Choke
How much potential difference can a material withstand before breaking down

28. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
American wire gauge(AWG)
Parallel
Electromagnetic field
The rate of doing work

29. What is the purpose of resistors in electrical circuits?
Cables
Strength of the charge
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Produce heat - light - or limit current to control it(all of the above)

30. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Gauge number
Area and spacing of capacitor - static current in the capacitor(both A and B)
Mutual induction
Insulation resistance and Dielectric strength(Both A and B)

31. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Voltage
Chemical action
Solenoid and Relay(both A and B)
10%

32. What is a property of inductors in electrical circuits?
Magnetic properties
Volts
12 volts
Opposes any change in the current flowing in a circuit

33. What are the common units of measurement for round and square conductor cross - sections?
A difference in potential energy
Volts
Circular and square mills(Both A and B)
Start with the band on the end and read to the center

34. What does Ohm's Law represent?
Wire splices
Alternating current
Silver
Relationship between current and potential difference

35. What is a conductor?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
15 -000 ohms - 20%
High resistance
Parallel

36. What determines the resistance of a resistor?
Composition of the resistor
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Secondary cell
Chemical action

37. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Amperes
Purging
Porcelain
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)

38. Identify the blueprint symbol for resistors.
Common - not rechargable - gradually discharges when in storage(All of the above)
Bonding and grounding
--^V^V^V^---
Wire splices

39. What is the basic law of magnetic force?
50 Ohms
Unlike poles attract
Voltage
Electromagnetic field

40. What makes electrons flow?
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)
Plastic - Rubber - Friction(all of the above)
Potential difference

41. What is the measure of 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)
The direction of the magnetic field
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Volts

42. How many kinds of poles do magnets have?
Two
Heat and current control(both a and c)
Solenoid and Relay(both A and B)
Amperes

43. What does a transformer transform?
Current flows in one direction - potential differences across a load does not change(Both A and B)
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)
The relationship of potential difference to current
Moving vehicles

44. What is resistance?
Volts
A magnetic field
Opposition to movement of free electrons
10%

45. What is a characteristic of insulators?
Voltage
Fixed - Electrolytic - Variable(all of the above)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Potential difference

46. What is the purpose of capacitors in electrical circuits?
Chemical action
Use an effect to produce another effect
Stores electrical charge
Strength of the charge

47. What is a common cause of static electricity in a shop?
Moving vehicles
By their covering
Relationship between current and potential difference
Bonding and grounding

48. What is the term for two or more cells attached together?
Battery
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)
Potential difference
Current flows in one direction - potential differences across a load does not change(Both A and B)

49. What is a type of capacitor?
Current change in a coil creates a magnetic change
Fixed - Electrolytic - Variable(all of the above)
Series circuit
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

50. What information do the Left-Hand Rules provide?
Electromagnetism
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
1 watt
Unlike poles attract