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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 can permanently break down a capacitor?
Electromagnetic field
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Secondary cell
Breakdown voltage

2. The generator is what method of creating potential energy?
Electromagnetism
The direction the negative charge moves
Ohms
From the negative battery terminal to the positive terminal

3. What is a DC circuit characteristic?
Magnetic properties
Current change in a coil creates a magnetic change
Current flows in one direction - potential differences across a load does not change(Both A and B)
Parallel

4. What is an electromagnet?
Magnetic properties
Breakdown voltage
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Electromagnetism

5. What is a type of mechanical transducer?
10
By their covering
1/1000th of an inch
Solenoid and Relay(both A and B)

6. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Serial
Current change in a coil creates a magnetic change
Grounding wire
50 Ohms

7. What is resistance in electrical terms?
Ohms
Symbol
Opposition to electrical current
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

8. What does Ohm's Law represent?
Relationship between current and potential difference
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
A difference in potential energy
Symbol

9. How do static charges distribute themselves?
Wire splices
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Silver
Strength of the charge

10. In most applications - what remains constant if the current remains constant and flows in one direction?
Electromagnetic field
10
Volts
50 Ohms

11. What is power?
The rate of doing work
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Bare - covered - insulated - stranded - cable(All of the above)
Energy

12. How many kinds of poles do magnets have?
Serial
20%
Breakdown voltage
Two

13. The thermocouple uses which method for creating potential energy?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Magnetic properties
Heat
10%

14. What is the use of the electromagnet?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Cells can be connected together to make a battery
Amperes
Energy

15. What do junction boxes protect?
Wire splices
Opposition to electrical current
Plastic - Rubber - Friction(all of the above)
Two

16. What information do the Left-Hand Rules provide?
Cell
From the negative battery terminal to the positive terminal
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Gauge number

17. What is the name for electrical resistance of insulation?
Insulation resistance
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Tolerence
A difference in potential energy

18. Which of the following is a type of resistor?
Resistance increases as the conductor length increases
Parallel
Porcelain
Fixed - tapped - variable(all of the above)

19. What is a way to classify wires and cables?
Parallel circuit
By their covering
Energy
Amperes

20. What is the difference between AC and DC?
Heat
Resistance value can not be changed
DC flows continuously in one direction and AC potential difference and current both change direction
The relationship of potential difference to current

21. What is the type of cable composed of many fine wires?
Stranded
50 Ohms
Plastic - Rubber - Friction(all of the above)
Potential difference

22. What is capacitance in electrical terms?
Ability to store an electric charge
Alternating current
Use an effect to produce another effect
A magnetic field

23. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Heat
12 volts
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
20%

24. What is true about a dry cell?
Electromagnetic field
Fixed - tapped - variable(all of the above)
Common - not rechargable - gradually discharges when in storage(All of the above)
Gauge number

25. What wire measurement is commonly used in the U.S.?
DC flows continuously in one direction and AC potential difference and current both change direction
Start with the band on the end and read to the center
American wire gauge(AWG)
Magnetic properties

26. What is the measure of potential difference?
The direction of the magnetic field
75 Ohms
The rate of doing work
Volts

27. What is a characteristic of insulators?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Mutual induction
12 volts
Chemical action

28. What is the basic law of magnetic force?
Cables
Unlike poles attract
Battery
Parallel circuit

29. What is a common form used in conductors?
Purging
1/1000th of an inch
Insulation resistance
Cables

30. What is the purpose of capacitors in electrical circuits?
15 -000 ohms - 20%
Stores electrical charge
Relay
Produce heat - light - or limit current to control it(all of the above)

31. What is insulation resistance?
Porcelain
Electrical resistance against the flow of current
5%
Breakdown voltage

32. How do you read resistor color codes?
Energy
Start with the band on the end and read to the center
Electromagnetism
Tolerence

33. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Current flows in one direction - potential differences across a load does not change(Both A and B)
10%
Volts
Electrical resistance against the flow of current

34. What does static electricity do?
Does not move
Potential difference - E*I - current times current change from point to point(all of the above)
Circular and square mills(Both A and B)
Unlike poles attract

35. A resistor is color coded brown - green - orange. What is its resistance?
The direction the negative charge moves
15 -000 ohms - 20%
By their covering
Solenoid and Relay(both A and B)

36. What is resistance?
Opposes any change in the current flowing in a circuit
75 Ohms
The direction of the magnetic field
Opposition to movement of free electrons

37. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
1 watt
Two
Voltage
Ability to store an electric charge

38. Where do the fingers point in both Left-Hand Rules?
The direction of the magnetic field
Cell
How much potential difference can a material withstand before breaking down
Potential difference - E*I - current times current change from point to point(all of the above)

39. What is the fundamental property of insulators?
Gauge number
Plastic - Rubber - Friction(all of the above)
Insulation resistance and Dielectric strength(Both A and B)
Opposes any change in the current flowing in a circuit

40. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Parallel
Purging
Circular and square mills(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)

41. When does a DC circuit oppose current flow?
Symbol
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Stranded

42. What is the purpose of resistors in electrical circuits?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Produce heat - light - or limit current to control it(all of the above)
Potential difference - E*I - current times current change from point to point(all of the above)
Moving vehicles

43. To what measurement do the conductor mills refer?
Bonding and grounding
1/1000th of an inch
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
20%

44. What determines the resistance of a resistor?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Wire splices
Composition of the resistor
Potential difference

45. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
Breakdown voltage
Porcelain
First digit

46. What is an arrangement of materials that create a potential difference by chemistry?
Magnetic properties
Cell
1/1000th of an inch
Volts

47. What is induction?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Current change in a coil creates a magnetic change
Current flows in one direction - potential differences across a load does not change(Both A and B)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

48. What does a transformer transform?
Insulation resistance and Dielectric strength(Both A and B)
Potential difference
The relationship of potential difference to current
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

49. What does a first band of white mean?
First digit is 9
Relay
Ohms
Relationship between current and potential difference

50. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Potential difference
First digit
Gauge number
Alternating current