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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 information do the Left-Hand Rules provide?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Opposition to electrical current
1/1000th of an inch
Stores electrical charge

2. What is a rigid metal conduit?
Silver
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Insulation resistance
Wire splices

3. How do static charges distribute themselves?
Parallel
Bare - covered - insulated - stranded - cable(All of the above)
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)

4. How is capacitance determined?
Common - not rechargable - gradually discharges when in storage(All of the above)
Potential difference - E*I - current times current change from point to point(all of the above)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Area and spacing of capacitor - static current in the capacitor(both A and B)

5. What is resistance?
Potential difference - E*I - current times current change from point to point(all of the above)
Opposition to movement of free electrons
Cables
From the negative battery terminal to the positive terminal

6. What is the unit of measurement of electrical current?
Heat
Magnetic properties
Amperes
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

7. What is voltage?
A difference in potential energy
Series circuit
First digit
Start with the band on the end and read to the center

8. What determines the resistance of a resistor?
Composition of the resistor
Opposition to electrical current
1 watt
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

9. What is the relationship between cells and batteries?
75 Ohms
Cells can be connected together to make a battery
Relationship between current and potential difference
A difference in potential energy

10. What must be large enough to carry the largest current likely to occur?
Does not move
Grounding wire
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

11. What does a transformer transform?
A difference in potential energy
Start with the band on the end and read to the center
Battery
The relationship of potential difference to current

12. What is needed for electric heating elements and the filaments of light bulbs?
High resistance
10%
Stores electrical charge
A difference in potential energy

13. What does a third band of brown mean?
Electromagnetic field
10
Symbol
Moving vehicles

14. What does resistance produce?
Circular and square mills(Both A and B)
Heat
Unlike poles attract
Produce heat - light - or limit current to control it(all of the above)

15. What do we call the ability to do work?
Energy
10
Electromagnetism
Fixed - tapped - variable(all of the above)

16. What is an arrangement of materials that create a potential difference by chemistry?
--^V^V^V^---
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Cell
Fixed - tapped - variable(all of the above)

17. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Strength of the charge
Mutual induction
How much potential difference can a material withstand before breaking down
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

18. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Fixed - tapped - variable(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Alternating current
Secondary cell

19. The dry cell is what method for creating potential energy?
Electromagnetism
How much potential difference can a material withstand before breaking down
Symbol
Chemical action

20. To what measurement do the conductor mills refer?
1/1000th of an inch
Amperes
Unlike poles attract
Electromagnetism

21. What is dielectric strength?
Opposition to movement of free electrons
How much potential difference can a material withstand before breaking down
Stores electrical charge
Does not move

22. What do electrical charges need to cause a fire or explosion?
Resistance increases as the conductor length increases
Does not move
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Two

23. Which of the following materials is NOT a good conductor?
Cell
Insulation resistance and Dielectric strength(Both A and B)
10%
Porcelain

24. What does static electricity do?
Cables
Mutual induction
Fixed - tapped - variable(all of the above)
Does not move

25. What are the two generic methods to eliminate static electricity from metal objects?
Bonding and grounding
The direction of the magnetic field
Ohms
Strength of the charge

26. 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
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Symbol
50 Ohms
12 volts

27. What is the term for doing work at the rate of joule per second?
Fixed - Electrolytic - Variable(all of the above)
Series circuit
1 watt
Silver

28. What makes electrons flow?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Volts
Solenoid and Relay(both A and B)
Potential difference

29. What is the purpose of resistors in electrical circuits?
The relationship of potential difference to current
Produce heat - light - or limit current to control it(all of the above)
Resistance increases as the conductor length increases
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

30. Which type of cell can be recharged?
75 Ohms
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Secondary cell
The direction of the magnetic field

31. What is the measure of potential difference?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Choke
Solenoid and Relay(both A and B)
Volts

32. The generator is what method of creating potential energy?
Electromagnetism
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
75 Ohms
20%

33. What is the fundamental property of insulators?
First digit
Purging
Insulation resistance and Dielectric strength(Both A and B)
Stores electrical charge

34. What is the unit of measurement of resistance?
Amperes
Ohms
Common - not rechargable - gradually discharges when in storage(All of the above)
Opposes any change in the current flowing in a circuit

35. What is a characteristic of insulators?
DC flows continuously in one direction and AC potential difference and current both change direction
Silver
Chemical action
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

36. What do transducers do in electrical terms?
Use an effect to produce another effect
Silver
Potential difference - E*I - current times current change from point to point(all of the above)
Heat and current control(both a and c)

37. What is a common measure of wire diameter?
Resistance value can not be changed
1/1000th of an inch
Potential difference - E*I - current times current change from point to point(all of the above)
Gauge number

38. What type of circuit has one path of follow through a load?
The relationship of potential difference to current
Heat and current control(both a and c)
Alternating current
Series circuit

39. What is a common cause of static electricity in a shop?
Moving vehicles
American wire gauge(AWG)
Magnetic properties
Composition of the resistor

40. What are the names of two of the six primary methods of producing a voltage?
1 watt
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Energy
The direction of the magnetic field

41. What wire measurement is commonly used in the U.S.?
50 Ohms
Circular and square mills(Both A and B)
American wire gauge(AWG)
DC flows continuously in one direction and AC potential difference and current both change direction

42. Identify the blueprint symbol for capacitors.
Symbol
15 -000 ohms - 20%
Two
Battery

43. The thermocouple uses which method for creating potential energy?
Energy
Heat
The rate of doing work
12 volts

44. What cannot be transformed to higher or lower potential differences?
DC current
Fixed - Electrolytic - Variable(all of the above)
Electromagnetism
High resistance

45. What is a wire classification?
1 watt
Current change in a coil creates a magnetic change
Bare - covered - insulated - stranded - cable(All of the above)
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)

46. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Cables
First digit
Voltage
Start with the band on the end and read to the center

47. What is a type of capacitor?
Electrical resistance against the flow of current
Fixed - Electrolytic - Variable(all of the above)
Alternating current
Stores electrical charge

48. What is a DC circuit characteristic?
Series circuit
Use an effect to produce another effect
Current flows in one direction - potential differences across a load does not change(Both A and B)
Heat and current control(both a and c)

49. What is the name for electrical resistance of insulation?
Current change in a coil creates a magnetic change
Insulation resistance
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Serial

50. How is the heat production measured in a resistor?
Heat
5%
--^V^V^V^---
Potential difference - E*I - current times current change from point to point(all of the above)