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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 common cause of static electricity in a shop?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
From the negative battery terminal to the positive terminal
Moving vehicles
Serial

2. Which type of cell can be recharged?
5%
Secondary cell
Bonding and grounding
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)

3. What is capacitance in electrical terms?
Ability to store an electric charge
Voltage
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
From the negative battery terminal to the positive terminal

4. What is a way to classify wires and cables?
By their covering
15 -000 ohms - 20%
Secondary cell
10%

5. How is the heat production measured in a resistor?
How much potential difference can a material withstand before breaking down
From the negative battery terminal to the positive terminal
Potential difference - E*I - current times current change from point to point(all of the above)
Heat

6. What types of protective tapes are used?
Plastic - Rubber - Friction(all of the above)
Cables
10%
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

7. What do electrical charges need to cause a fire or explosion?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
DC current
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Potential difference - E*I - current times current change from point to point(all of the above)

8. What is a rigid metal conduit?
Opposes any change in the current flowing in a circuit
15 -000 ohms - 20%
Opposition to electrical current
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

9. What is the type of cable composed of many fine wires?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Stranded
Produce heat - light - or limit current to control it(all of the above)
How much potential difference can a material withstand before breaking down

10. What does resistance produce?
Heat
Potential difference
Potential difference
Relationship between current and potential difference

11. What determines the resistance of a resistor?
Solenoid and Relay(both A and B)
Composition of the resistor
Current flows in one direction - potential differences across a load does not change(Both A and B)
Symbol

12. Which of the following materials is NOT a good conductor?
Use an effect to produce another effect
Porcelain
Opposition to movement of free electrons
Parallel circuit

13. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
Fixed - tapped - variable(all of the above)
Voltage
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

14. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Bare - covered - insulated - stranded - cable(All of the above)
1 watt
5%
Moving vehicles

15. What is resistance?
Opposition to movement of free electrons
A difference in potential energy
First digit
Choke

16. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Gauge number
Tolerence
Voltage

17. What is a common measure of wire diameter?
How much potential difference can a material withstand before breaking down
Series circuit
Gauge number
Cables

18. What is the relationship of conductor size and length to resistance?
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)
Resistance value can not be changed
1/1000th of an inch
Resistance increases as the conductor length increases

19. What does Ohm's Law represent?
High resistance
Ohms
Relationship between current and potential difference
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

20. When reading resistance color codes - what does the first band indicate?
Tolerence
10%
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)
First digit

21. The thermocouple uses which method for creating potential energy?
Use an effect to produce another effect
Current flows in one direction - potential differences across a load does not change(Both A and B)
Alternating current
Heat

22. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
50 Ohms
Energy
Voltage
Cells can be connected together to make a battery

23. What is power?
Mutual induction
The rate of doing work
Energy
From the negative battery terminal to the positive terminal

24. What is induction?
Grounding wire
Current change in a coil creates a magnetic change
Gauge number
Insulation resistance and Dielectric strength(Both A and B)

25. What are the names of two of the six primary methods of producing a voltage?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Parallel circuit
Moving vehicles
Potential difference

26. What is the term for doing work at the rate of joule per second?
Gauge number
Volts
1 watt
Grounding wire

27. What is an electromagnet?
--^V^V^V^---
Wire splices
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
10%

28. What is a DC circuit characteristic?
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)
Use an effect to produce another effect
Current flows in one direction - potential differences across a load does not change(Both A and B)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

29. What does a first band of white mean?
How much potential difference can a material withstand before breaking down
Breakdown voltage
Common - not rechargable - gradually discharges when in storage(All of the above)
First digit is 9

30. What determines whether a spark can be produced?
DC flows continuously in one direction and AC potential difference and current both change direction
Choke
Silver
Strength of the charge

31. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Insulation resistance and Dielectric strength(Both A and B)
Purging
Grounding wire
Composition of the resistor

32. What is insulation resistance?
High resistance
Circular and square mills(Both A and B)
Electrical resistance against the flow of current
10%

33. Which material has the lowest resistance at ordinary temperatures?
Symbol
Opposition to electrical current
Silver
Purging

34. What information do the Left-Hand Rules provide?
12 volts
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Chemical action
Cells can be connected together to make a battery

35. What can permanently break down a capacitor?
Wire splices
Breakdown voltage
Strength of the charge
Produce heat - light - or limit current to control it(all of the above)

36. Where do the fingers point in both Left-Hand Rules?
Symbol
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
The direction of the magnetic field
10%

37. How do you read resistor color codes?
Grounding wire
10
Amperes
Start with the band on the end and read to the center

38. What instrument measures voltage?
Bonding and grounding
Voltmeter
Secondary cell
Cables

39. A resistor is color coded brown - green - orange. What is its resistance?
15 -000 ohms - 20%
By their covering
First digit is 9
Stores electrical charge

40. What is a conductor?
50 Ohms
Plastic - Rubber - Friction(all of the above)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Serial

41. What is a characteristic of a fixed resistor?
Stores electrical charge
By their covering
DC current
Resistance value can not be changed

42. What is the fundamental property of insulators?
Insulation resistance and Dielectric strength(Both A and B)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Heat
Electromagnetism

43. What do junction boxes protect?
Series circuit
20%
Produce heat - light - or limit current to control it(all of the above)
Wire splices

44. Which of the following is a type of resistor?
First digit
From the negative battery terminal to the positive terminal
Fixed - tapped - variable(all of the above)
Grounding wire

45. What is the unit of measurement of electrical current?
Amperes
Energy
Insulation resistance
Gauge number

46. What are the common units of measurement for round and square conductor cross - sections?
Circular and square mills(Both A and B)
Potential difference - E*I - current times current change from point to point(all of the above)
First digit is 9
Heat

47. What is another name for an inductor?
50 Ohms
Choke
Resistance increases as the conductor length increases
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

48. When does a DC circuit oppose current flow?
First digit
Opposition to movement of free electrons
Solenoid and Relay(both A and B)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

49. What is a switch that operates by electricity?
Common - not rechargable - gradually discharges when in storage(All of the above)
Opposes any change in the current flowing in a circuit
Volts
Relay

50. The generator is what method of creating potential energy?
Potential difference - E*I - current times current change from point to point(all of the above)
Does not move
Voltmeter
Electromagnetism