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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 reading resistance color codes - what does the first band indicate?
First digit
Current change in a coil creates a magnetic change
Stores electrical charge
Voltmeter

2. What type of circuit has two or more paths for current to follow?
Ability to store an electric charge
Series circuit
Symbol
Parallel circuit

3. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
Fixed - tapped - variable(all of the above)
Resistance increases as the conductor length increases
Serial

4. What do we call the ability to do work?
Parallel
Energy
12 volts
How much potential difference can a material withstand before breaking down

5. When does a DC circuit oppose current flow?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Two
Strength of the charge
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)

6. What does an object have if a magnetic field acts on it?
Heat
Magnetic properties
The relationship of potential difference to current
DC current

7. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Mutual induction
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
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

8. What is the difference between AC and DC?
Gauge number
Stranded
DC flows continuously in one direction and AC potential difference and current both change direction
Electromagnetic field

9. Where do the fingers point in both Left-Hand Rules?
Bare - covered - insulated - stranded - cable(All of the above)
The direction of the magnetic field
Fixed - Electrolytic - Variable(all of the above)
10%

10. What cannot be transformed to higher or lower potential differences?
DC current
The direction the negative charge moves
Secondary cell
A difference in potential energy

11. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
50 Ohms
Opposition to movement of free electrons
Relationship between current and potential difference
Area and spacing of capacitor - static current in the capacitor(both A and B)

12. Which type of cell can be recharged?
Plastic - Rubber - Friction(all of the above)
Strength of the charge
Secondary cell
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

13. What do transducers do in electrical terms?
Parallel circuit
Amperes
Use an effect to produce another effect
Heat

14. What is a type of mechanical transducer?
Purging
Solenoid and Relay(both A and B)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Current change in a coil creates a magnetic change

15. What is a switch that operates by electricity?
Magnetic properties
Heat and current control(both a and c)
Fixed - Electrolytic - Variable(all of the above)
Relay

16. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
By their covering
Stranded
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
20%

17. What does a transformer transform?
DC flows continuously in one direction and AC potential difference and current both change direction
The relationship of potential difference to current
Amperes
Series circuit

18. What does a moving charge produce?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Parallel
A magnetic field
The rate of doing work

19. What is the purpose of a raceway?
Voltage
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
The direction the negative charge moves
Alternating current

20. What is the type of cable composed of many fine wires?
Stranded
Potential difference
First digit
Resistance value can not be changed

21. What is a characteristic of insulators?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
From the negative battery terminal to the positive terminal
Secondary cell
Choke

22. What types of protective tapes are used?
5%
Current change in a coil creates a magnetic change
Plastic - Rubber - Friction(all of the above)
12 volts

23. What is a common form used in conductors?
How much potential difference can a material withstand before breaking down
Cables
Voltmeter
Two

24. Which of the following materials is NOT a good conductor?
Porcelain
Symbol
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Resistance value can not be changed

25. What is a property of inductors in electrical circuits?
Voltage
Volts
DC flows continuously in one direction and AC potential difference and current both change direction
Opposes any change in the current flowing in a circuit

26. What is the term for two or more cells attached together?
Parallel circuit
Battery
Opposition to electrical current
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

27. What does resistance produce?
Opposition to movement of free electrons
Heat
Plastic - Rubber - Friction(all of the above)
Porcelain

28. What does static electricity do?
Does not move
Produce heat - light - or limit current to control it(all of the above)
Stranded
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)

29. What is insulation resistance?
Series circuit
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
The rate of doing work
Electrical resistance against the flow of current

30. How do static charges distribute themselves?
Resistance increases as the conductor length increases
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Potential difference
Chemical action

31. When reading resistance color codes - what does the fourth band indicate?
Grounding wire
Tolerence
The relationship of potential difference to current
Produce heat - light - or limit current to control it(all of the above)

32. Identify the blueprint symbol for resistors.
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Does not move
12 volts
--^V^V^V^---

33. 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
Potential difference - E*I - current times current change from point to point(all of the above)
Two
12 volts
Cells can be connected together to make a battery

34. What is a wire classification?
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)
Common - not rechargable - gradually discharges when in storage(All of the above)
20%

35. What determines the resistance of a resistor?
Composition of the resistor
How much potential difference can a material withstand before breaking down
Breakdown voltage
First digit is 9

36. The thermocouple uses which method for creating potential energy?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Heat
Electromagnetism
Strength of the charge

37. What do junction boxes protect?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Stores electrical charge
Wire splices
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

38. The dry cell is what method for creating potential energy?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Chemical action
Fixed - tapped - variable(all of the above)
Choke

39. What can permanently break down a capacitor?
Gauge number
Start with the band on the end and read to the center
Breakdown voltage
Current change in a coil creates a magnetic change

40. What is the relationship between cells and batteries?
20%
Ability to store an electric charge
Cells can be connected together to make a battery
Cables

41. What are the common units of measurement for round and square conductor cross - sections?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Circular and square mills(Both A and B)
First digit is 9

42. What is a type of capacitor?
1 watt
Produce heat - light - or limit current to control it(all of the above)
Fixed - Electrolytic - Variable(all of the above)
Battery

43. What is a common measure of wire diameter?
Heat and current control(both a and c)
Start with the band on the end and read to the center
Gauge number
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

44. How do you read resistor color codes?
Energy
Electrical resistance against the flow of current
American wire gauge(AWG)
Start with the band on the end and read to the center

45. What instrument measures voltage?
First digit
Potential difference - E*I - current times current change from point to point(all of the above)
Fixed - Electrolytic - Variable(all of the above)
Voltmeter

46. What does a first band of white mean?
First digit is 9
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Gauge number
Chemical action

47. What are the two generic methods to eliminate static electricity from metal objects?
Strength of the charge
Bonding and grounding
Voltmeter
Breakdown voltage

48. What wire measurement is commonly used in the U.S.?
American wire gauge(AWG)
The rate of doing work
Voltmeter
Chemical action

49. What is an electromagnet?
Common - not rechargable - gradually discharges when in storage(All of the above)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Bare - covered - insulated - stranded - cable(All of the above)
Two

50. What is capacitance in electrical terms?
Ohms
Ability to store an electric charge
Battery
Resistance increases as the conductor length increases