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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 determines whether a spark can be produced?
Start with the band on the end and read to the center
Use an effect to produce another effect
Strength of the charge
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

2. What is true about a dry cell?
Strength of the charge
Relationship between current and potential difference
Ability to store an electric charge
Common - not rechargable - gradually discharges when in storage(All of the above)

3. Where do the fingers point in both Left-Hand Rules?
Insulation resistance and Dielectric strength(Both A and B)
Heat and current control(both a and c)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
The direction of the magnetic field

4. Where does the thumb point in both Left-Hand Rules?
Plastic - Rubber - Friction(all of the above)
The direction the negative charge moves
5%
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

5. What do transducers do in electrical terms?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Use an effect to produce another effect
The rate of doing work
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

6. What is the unit of measurement of electrical current?
50 Ohms
20%
Amperes
12 volts

7. When reading resistance color codes - what does the fourth band indicate?
Stranded
Composition of the resistor
Tolerence
Common - not rechargable - gradually discharges when in storage(All of the above)

8. A resistor is color coded brown - green - orange. What is its resistance?
Use an effect to produce another effect
15 -000 ohms - 20%
Moving vehicles
Area and spacing of capacitor - static current in the capacitor(both A and B)

9. What is the term for doing work at the rate of joule per second?
1/1000th of an inch
1 watt
Chemical action
Potential difference - E*I - current times current change from point to point(all of the above)

10. What is an arrangement of materials that create a potential difference by chemistry?
Opposes any change in the current flowing in a circuit
Does not move
Resistance increases as the conductor length increases
Cell

11. What instrument measures voltage?
Composition of the resistor
Voltmeter
Unlike poles attract
Mutual induction

12. What is the measure of potential difference?
Voltmeter
Heat and current control(both a and c)
Heat
Volts

13. What types of protective tapes are used?
Plastic - Rubber - Friction(all of the above)
Magnetic properties
Symbol
Secondary cell

14. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Opposition to movement of free electrons
The direction the negative charge moves
Plastic - Rubber - Friction(all of the above)
20%

15. What is resistance in electrical terms?
Resistance increases as the conductor length increases
Opposition to electrical current
American wire gauge(AWG)
How much potential difference can a material withstand before breaking down

16. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Current change in a coil creates a magnetic change
Alternating current
Grounding wire

17. 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
Volts
10
Gauge number
75 Ohms

18. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Voltage
Purging
Strength of the charge
Magnetic properties

19. What do junction boxes protect?
Energy
Silver
Wire splices
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)

20. What is the unit of measurement of potential difference?
5%
Volts
Cells can be connected together to make a battery
Electromagnetic field

21. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
From the negative battery terminal to the positive terminal
Parallel
Parallel circuit
1/1000th of an inch

22. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Mutual induction
DC flows continuously in one direction and AC potential difference and current both change direction
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Resistance value can not be changed

23. What determines the resistance of a resistor?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Circular and square mills(Both A and B)
Moving vehicles
Composition of the resistor

24. What is the purpose of capacitors in electrical circuits?
Secondary cell
Relay
High resistance
Stores electrical charge

25. Which material has the lowest resistance at ordinary temperatures?
Heat
Silver
Purging
By their covering

26. What is a switch that operates by electricity?
Relay
Electrical resistance against the flow of current
The rate of doing work
1/1000th of an inch

27. Identify the general blueprint symbol for inductors.
Strength of the charge
Unlike poles attract
Symbol
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

28. What is the purpose of a raceway?
Heat
Potential difference
Circular and square mills(Both A and B)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

29. How do static charges distribute themselves?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
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)
Amperes
Purging

30. What is needed for electric heating elements and the filaments of light bulbs?
Plastic - Rubber - Friction(all of the above)
High resistance
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)
Heat and current control(both a and c)

31. What are the common units of measurement for round and square conductor cross - sections?
Stranded
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Circular and square mills(Both A and B)
Common - not rechargable - gradually discharges when in storage(All of the above)

32. What is a common cause of static electricity in a shop?
Potential difference
Heat
Electromagnetic field
Moving vehicles

33. What does a first band of white mean?
Bare - covered - insulated - stranded - cable(All of the above)
A magnetic field
Parallel
First digit is 9

34. What is a type of mechanical transducer?
Solenoid and Relay(both A and B)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Insulation resistance
Parallel circuit

35. What is the fundamental property of insulators?
10
Insulation resistance and Dielectric strength(Both A and B)
Resistance value can not be changed
50 Ohms

36. The dry cell is what method for creating potential energy?
First digit is 9
Electrical resistance against the flow of current
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Chemical action

37. Which type of cell can be recharged?
Amperes
Secondary cell
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Serial

38. What is a common form used in conductors?
Cables
Fixed - tapped - variable(all of the above)
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

39. What wire measurement is commonly used in the U.S.?
10%
Battery
A magnetic field
American wire gauge(AWG)

40. What does Ohm's Law represent?
Relationship between current and potential difference
Solenoid and Relay(both A and B)
Moving vehicles
High resistance

41. What results when current is run through a material with high resistance?
How much potential difference can a material withstand before breaking down
Parallel
Insulation resistance and Dielectric strength(Both A and B)
Heat and current control(both a and c)

42. The thermocouple uses which method for creating potential energy?
First digit is 9
Area and spacing of capacitor - static current in the capacitor(both A and B)
Use an effect to produce another effect
Heat

43. In most applications - what remains constant if the current remains constant and flows in one direction?
Electromagnetic field
Current change in a coil creates a magnetic change
Does not move
DC flows continuously in one direction and AC potential difference and current both change direction

44. What are the two generic methods to eliminate static electricity from metal objects?
Opposition to electrical current
Breakdown voltage
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)
Bonding and grounding

45. What type of circuit has one path of follow through a load?
Series circuit
Volts
--^V^V^V^---
Current change in a coil creates a magnetic change

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)
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)
Choke
Solenoid and Relay(both A and B)

47. 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
Use an effect to produce another effect
12 volts
Circular and square mills(Both A and B)
Gauge number

48. What is a wire classification?
Secondary cell
Bare - covered - insulated - stranded - cable(All of the above)
Symbol
First digit is 9

49. What do we call the ability to do work?
Energy
Parallel circuit
20%
Does not move

50. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Purging
Two
10%
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)