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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 an electromagnet?
Stores electrical charge
Cell
Bare - covered - insulated - stranded - cable(All of the above)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

2. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Electromagnetism
50 Ohms
A magnetic field
Wire splices

3. What type of circuit has two or more paths for current to follow?
Parallel circuit
Bare - covered - insulated - stranded - cable(All of the above)
Gauge number
DC flows continuously in one direction and AC potential difference and current both change direction

4. What is the use of the electromagnet?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Relay
Cables
Parallel circuit

5. How do static charges distribute themselves?
Choke
Volts
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Potential difference

6. What types of protective tapes are used?
Electromagnetic field
Use an effect to produce another effect
Start with the band on the end and read to the center
Plastic - Rubber - Friction(all of the above)

7. What cannot be transformed to higher or lower potential differences?
Plastic - Rubber - Friction(all of the above)
--^V^V^V^---
DC current
Bonding and grounding

8. Identify the general blueprint symbol for inductors.
Area and spacing of capacitor - static current in the capacitor(both A and B)
Symbol
Porcelain
Solenoid and Relay(both A and B)

9. A resistor is color coded brown - green - orange. What is its resistance?
Ohms
15 -000 ohms - 20%
Symbol
Cells can be connected together to make a battery

10. What is a DC circuit characteristic?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Choke
Potential difference
Secondary cell

11. What is the purpose of a raceway?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Tolerence
Cells can be connected together to make a battery
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

12. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
Heat
Ohms
Parallel circuit

13. What is the difference between AC and DC?
DC flows continuously in one direction and AC potential difference and current both change direction
Grounding wire
Solenoid and Relay(both A and B)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

14. 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
Secondary cell
12 volts
By their covering
Stranded

15. When does a DC circuit oppose current flow?
DC current
Does not move
Potential difference
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

16. What is the basic law of magnetic force?
Unlike poles attract
Opposition to electrical current
12 volts
1/1000th of an inch

17. What is the relationship between magnetism and electricity?
Silver
Fixed - Electrolytic - Variable(all of the above)
Ability to store an electric charge
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)

18. What is insulation resistance?
The direction the negative charge moves
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Heat and current control(both a and c)
Electrical resistance against the flow of current

19. What makes electrons flow?
Potential difference
High resistance
Amperes
Two

20. Where do the fingers point in both Left-Hand Rules?
10%
The direction of the magnetic field
Silver
1/1000th of an inch

21. What is a switch that operates by electricity?
Potential difference - E*I - current times current change from point to point(all of the above)
Potential difference
Alternating current
Relay

22. What is a type of capacitor?
Fixed - Electrolytic - Variable(all of the above)
Solenoid and Relay(both A and B)
Relay
Circular and square mills(Both A and B)

23. What is the unit of measurement of resistance?
Opposes any change in the current flowing in a circuit
Ohms
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
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)

24. What makes electrons flow?
Potential difference
Volts
Composition of the resistor
Fixed - tapped - variable(all of the above)

25. Why is the transformer important to AC electricity?

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26. What is an arrangement of materials that create a potential difference by chemistry?
Opposition to movement of free electrons
The rate of doing work
Cell
First digit is 9

27. Which material has the lowest resistance at ordinary temperatures?
Silver
Stranded
The relationship of potential difference to current
Resistance value can not be changed

28. The dry cell is what method for creating potential energy?
Resistance value can not be changed
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
From the negative battery terminal to the positive terminal
Chemical action

29. What can permanently break down a capacitor?
Breakdown voltage
Common - not rechargable - gradually discharges when in storage(All of the above)
Tolerence
Area and spacing of capacitor - static current in the capacitor(both A and B)

30. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Stranded
Purging
12 volts
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

31. Identify the blueprint symbol for capacitors.
Cell
Potential difference
Insulation resistance
Symbol

32. What do electrical charges need to cause a fire or explosion?
50 Ohms
Two
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Tolerence

33. What is dielectric strength?
Stranded
How much potential difference can a material withstand before breaking down
Battery
Common - not rechargable - gradually discharges when in storage(All of the above)

34. 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
75 Ohms
Parallel circuit
Parallel
10%

35. What is the type of cable composed of many fine wires?
Stranded
First digit
Cell
Silver

36. What are the common units of measurement for round and square conductor cross - sections?
Plastic - Rubber - Friction(all of the above)
Insulation resistance and Dielectric strength(Both A and B)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Circular and square mills(Both A and B)

37. What do junction boxes protect?
Wire splices
DC flows continuously in one direction and AC potential difference and current both change direction
Battery
Start with the band on the end and read to the center

38. What is the measure of potential difference?
Volts
15 -000 ohms - 20%
Opposition to electrical current
Cables

39. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Symbol
Current flows in one direction - potential differences across a load does not change(Both A and B)
Electromagnetism
Serial

40. Which of the following materials is NOT a good conductor?
Porcelain
Heat
Volts
1/1000th of an inch

41. How many kinds of poles do magnets have?
Two
Strength of the charge
Magnetic properties
Battery

42. What must be large enough to carry the largest current likely to occur?
Silver
Grounding wire
12 volts
Insulation resistance and Dielectric strength(Both A and B)

43. What information do the Left-Hand Rules provide?
Secondary cell
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
10
Bonding and grounding

44. What does Ohm's Law represent?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Magnetic properties
Strength of the charge
Relationship between current and potential difference

45. What is another name for an inductor?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Volts
Two
Choke

46. How is the heat production measured in a resistor?
Potential difference - E*I - current times current change from point to point(all of the above)
Porcelain
Fixed - tapped - variable(all of the above)
Secondary cell

47. What are the two generic methods to eliminate static electricity from metal objects?
Porcelain
Bonding and grounding
Circular and square mills(Both A and B)
The direction the negative charge moves

48. What is the purpose of resistors in electrical circuits?
Parallel
Plastic - Rubber - Friction(all of the above)
Heat and current control(both a and c)
Produce heat - light - or limit current to control it(all of the above)

49. How do you read resistor color codes?
Opposition to movement of free electrons
Start with the band on the end and read to the center
Chemical action
Choke

50. What does a third band of brown mean?
Resistance value can not be changed
10
15 -000 ohms - 20%
Energy