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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 property of inductors in electrical circuits?
Electromagnetism
Opposes any change in the current flowing in a circuit
Resistance increases as the conductor length increases
Insulation resistance and Dielectric strength(Both A and B)

2. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
The rate of doing work
Volts
Potential difference - E*I - current times current change from point to point(all of the above)
Serial

3. Why is the transformer important to AC electricity?

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4. What do junction boxes protect?
Heat
Stores electrical charge
Solenoid and Relay(both A and B)
Wire splices

5. What type of circuit has one path of follow through a load?
50 Ohms
Battery
Opposition to electrical current
Series circuit

6. What is the use of the electromagnet?
Amperes
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
The rate of doing work
10

7. What is a rigid metal conduit?
Relationship between current and potential difference
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Relay
Purging

8. What is the type of cable composed of many fine wires?
Current change in a coil creates a magnetic change
Insulation resistance and Dielectric strength(Both A and B)
Mutual induction
Stranded

9. 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
The direction of the magnetic field
12 volts
Ohms
Purging

10. What are the two generic methods to eliminate static electricity from metal objects?
Magnetic properties
Bonding and grounding
Stores electrical charge
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

11. What is the relationship of conductor size and length to resistance?
From the negative battery terminal to the positive terminal
Resistance increases as the conductor length increases
Potential difference
The direction of the magnetic field

12. What instrument measures voltage?
Volts
Voltmeter
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)
Electromagnetic field

13. What is induction?
Cell
Unlike poles attract
Current change in a coil creates a magnetic change
Composition of the resistor

14. What is a characteristic of insulators?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Tolerence
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Relay

15. A resistor is color coded brown - green - orange. What is its resistance?
Volts
Secondary cell
15 -000 ohms - 20%
Electromagnetic field

16. The dry cell is what method for creating potential energy?
Mutual induction
Plastic - Rubber - Friction(all of the above)
Chemical action
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

17. Identify the general blueprint symbol for inductors.
50 Ohms
By their covering
Symbol
Resistance value can not be changed

18. What is power?
American wire gauge(AWG)
The rate of doing work
Parallel
How much potential difference can a material withstand before breaking down

19. In most applications - what remains constant if the current remains constant and flows in one direction?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Heat
Electromagnetic field
Purging

20. What makes electrons flow?
Potential difference
75 Ohms
How much potential difference can a material withstand before breaking down
Amperes

21. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
10
Voltage
Potential difference
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

22. How do static charges distribute themselves?
5%
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Circular and square mills(Both A and B)
50 Ohms

23. What is a way to classify wires and cables?
By their covering
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Volts
Wire splices

24. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
A magnetic field
Parallel circuit
First digit is 9
10%

25. Which of the following is a type of resistor?
Fixed - tapped - variable(all of the above)
First digit
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Magnetic properties

26. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
15 -000 ohms - 20%
20%
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
By their covering

27. What is resistance in electrical terms?
Unlike poles attract
Opposition to electrical current
Symbol
Voltage

28. What does static electricity do?
Cell
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Does not move
Unlike poles attract

29. What is a common cause of static electricity in a shop?
Symbol
Moving vehicles
50 Ohms
Stores electrical charge

30. 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
Ability to store an electric charge
75 Ohms
Heat
The relationship of potential difference to current

31. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Alternating current
Unlike poles attract
The direction the negative charge moves
Cells can be connected together to make a battery

32. What types of protective tapes are used?
By their covering
First digit is 9
Does not move
Plastic - Rubber - Friction(all of the above)

33. What is a type of mechanical transducer?
Secondary cell
Voltage
Solenoid and Relay(both A and B)
Mutual induction

34. What is an electromagnet?
Does not move
Symbol
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Electromagnetic field

35. When does a DC circuit oppose current flow?
Heat and current control(both a and c)
American wire gauge(AWG)
Series circuit
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

36. What is resistance?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Opposition to movement of free electrons
Voltage
Potential difference - E*I - current times current change from point to point(all of the above)

37. When reading resistance color codes - what does the fourth band indicate?
Breakdown voltage
The relationship of potential difference to current
Fixed - Electrolytic - Variable(all of the above)
Tolerence

38. What is the basic law of magnetic force?
Energy
Unlike poles attract
Amperes
1/1000th of an inch

39. What do we call the ability to do work?
Energy
Cell
Common - not rechargable - gradually discharges when in storage(All of the above)
Parallel circuit

40. What do electrical charges need to cause a fire or explosion?
From the negative battery terminal to the positive terminal
Magnetic properties
Energy
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

41. What information do the Left-Hand Rules provide?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Secondary cell
Alternating current
Ability to store an electric charge

42. What is a wire classification?
Electrical resistance against the flow of current
Bare - covered - insulated - stranded - cable(All of the above)
Circular and square mills(Both A and B)
The rate of doing work

43. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Bonding and grounding
First digit is 9
50 Ohms
Cell

44. What are the names of two of the six primary methods of producing a voltage?
Silver
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Resistance value can not be changed
The rate of doing work

45. What is the purpose of a raceway?
Voltage
12 volts
Heat and current control(both a and c)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

46. Where do the fingers point in both Left-Hand Rules?
Secondary cell
The direction of the magnetic field
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Serial

47. What is voltage?
Use an effect to produce another effect
Moving vehicles
75 Ohms
A difference in potential energy

48. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Fixed - tapped - variable(all of the above)
5%
Bonding and grounding
High resistance

49. What cannot be transformed to higher or lower potential differences?
DC current
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 direction the negative charge moves
Voltmeter

50. What type of circuit has two or more paths for current to follow?
A difference in potential energy
Parallel circuit
Opposition to movement of free electrons
Current flows in one direction - potential differences across a load does not change(Both A and B)