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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. When does a DC circuit oppose current flow?
Current change in a coil creates a magnetic change
15 -000 ohms - 20%
The rate of doing work
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

2. What is a wire classification?
Voltage
Bare - covered - insulated - stranded - cable(All of the above)
Resistance value can not be changed
15 -000 ohms - 20%

3. What is power?
Magnetic properties
Battery
The rate of doing work
Tolerence

4. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
The rate of doing work
Voltage
Gauge number

5. What is a common measure of wire diameter?
Breakdown voltage
The relationship of potential difference to current
Gauge number
Produce heat - light - or limit current to control it(all of the above)

6. How do you read resistor color codes?
Start with the band on the end and read to the center
Relationship between current and potential difference
20%
Electromagnetic field

7. What can permanently break down a capacitor?
Wire splices
Volts
Breakdown voltage
15 -000 ohms - 20%

8. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Alternating current
Serial
Energy
15 -000 ohms - 20%

9. What is an electromagnet?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
The direction of the magnetic field
Volts
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

10. What is the name for electrical resistance of insulation?
First digit
Insulation resistance
Chemical action
Cables

11. What is the basic law of magnetic force?
Potential difference
Serial
Unlike poles attract
Choke

12. What does a moving charge produce?
Silver
A magnetic field
Energy
Choke

13. Which of the following is a type of resistor?
Cells can be connected together to make a battery
Fixed - tapped - variable(all of the above)
Resistance increases as the conductor length increases
--^V^V^V^---

14. What do we call the ability to do work?
Chemical action
Cables
Energy
75 Ohms

15. To what measurement do the conductor mills refer?
1/1000th of an inch
Bonding and grounding
Wire splices
Common - not rechargable - gradually discharges when in storage(All of the above)

16. In most applications - what remains constant if the current remains constant and flows in one direction?
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 of the magnetic field
Produce heat - light - or limit current to control it(all of the above)
Electromagnetic field

17. What do transducers do in electrical terms?
Current change in a coil creates a magnetic change
Ohms
Use an effect to produce another effect
How much potential difference can a material withstand before breaking down

18. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Relationship between current and potential difference
10%
Cell
Volts

19. Identify the blueprint symbol for resistors.
--^V^V^V^---
Electrical resistance against the flow of current
The direction the negative charge moves
Chemical action

20. What cannot be transformed to higher or lower potential differences?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Amperes
DC current
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

21. What is resistance?
Volts
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
1/1000th of an inch
Opposition to movement of free electrons

22. What is the measure of potential difference?
By their covering
Volts
1 watt
Parallel circuit

23. What is dielectric strength?
How much potential difference can a material withstand before breaking down
Energy
Cables
Fixed - tapped - variable(all of the above)

24. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
DC current
Circular and square mills(Both A and B)
Start with the band on the end and read to the center
Parallel

25. What is a type of capacitor?
Fixed - Electrolytic - Variable(all of the above)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Resistance increases as the conductor length increases
American wire gauge(AWG)

26. How is the heat production measured in a resistor?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
20%
Potential difference - E*I - current times current change from point to point(all of the above)
Bare - covered - insulated - stranded - cable(All of the above)

27. Which of the following materials is NOT a good conductor?
Magnetic properties
Porcelain
Opposition to electrical current
Gauge number

28. What is the term for two or more cells attached together?
Current change in a coil creates a magnetic change
20%
Battery
Electromagnetic field

29. What does a first band of white mean?
75 Ohms
First digit is 9
A magnetic field
1/1000th of an inch

30. What is a way to classify wires and cables?
By their covering
Potential difference
Breakdown voltage
Parallel circuit

31. The dry cell is what method for creating potential energy?
Two
Potential difference
Chemical action
Fixed - Electrolytic - Variable(all of the above)

32. What instrument measures voltage?
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)
Gauge number
Voltmeter
Bare - covered - insulated - stranded - cable(All of the above)

33. Identify the blueprint symbol for capacitors.
Area and spacing of capacitor - static current in the capacitor(both A and B)
Symbol
Series circuit
Cell

34. What is a switch that operates by electricity?
Two
Heat
Relay
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

35. Identify the general blueprint symbol for inductors.
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)
Symbol
Cell
Resistance increases as the conductor length increases

36. What is induction?
Symbol
Potential difference
Current change in a coil creates a magnetic change
High resistance

37. What is resistance in electrical terms?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Moving vehicles
Opposition to electrical current
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

38. What information do the Left-Hand Rules provide?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Moving vehicles
Opposition to movement of free electrons

39. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Serial
Choke
--^V^V^V^---
Bonding and grounding

40. How is capacitance determined?
Area and spacing of capacitor - static current in the capacitor(both A and B)
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)
Insulation resistance and Dielectric strength(Both A and B)
5%

41. Why is the transformer important to AC electricity?

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42. What are the common units of measurement for round and square conductor cross - sections?
Circular and square mills(Both A and B)
Resistance increases as the conductor length increases
Parallel circuit
Opposes any change in the current flowing in a circuit

43. What is the purpose of a raceway?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Porcelain
Ability to store an electric charge

44. Where does the thumb point in both Left-Hand Rules?
Composition of the resistor
Battery
Area and spacing of capacitor - static current in the capacitor(both A and B)
The direction the negative charge moves

45. What is the relationship between magnetism and electricity?
Silver
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)
Series circuit
Voltmeter

46. What is the difference between AC and DC?
Electromagnetic field
Current change in a coil creates a magnetic change
DC flows continuously in one direction and AC potential difference and current both change direction
The direction of the magnetic field

47. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
1/1000th of an inch
Choke
A magnetic field

48. What is the relationship of conductor size and length to resistance?
Symbol
15 -000 ohms - 20%
Ability to store an electric charge
Resistance increases as the conductor length increases

49. What do junction boxes protect?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Parallel circuit
Wire splices
Series circuit

50. A resistor is color coded brown - green - orange. What is its resistance?
Energy
Bonding and grounding
Electromagnetic field
15 -000 ohms - 20%