Test your basic knowledge |

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. How is the heat production measured in a resistor?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Potential difference - E*I - current times current change from point to point(all of the above)
From the negative battery terminal to the positive terminal
Resistance increases as the conductor length increases

2. 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
Opposition to electrical current
Area and spacing of capacitor - static current in the capacitor(both A and B)
Choke
12 volts

3. How do you read resistor color codes?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Start with the band on the end and read to the center
Battery
The relationship of potential difference to current

4. When reading resistance color codes - what does the fourth band indicate?
A magnetic field
Tolerence
The direction the negative charge moves
Energy

5. What is an arrangement of materials that create a potential difference by chemistry?
Opposition to movement of free electrons
Cell
Two
Produce heat - light - or limit current to control it(all of the above)

6. How do static charges distribute themselves?
Ability to store an electric charge
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
The relationship of potential difference to current
5%

7. What is the name for electrical resistance of insulation?
Voltage
Insulation resistance
Parallel circuit
Fixed - Electrolytic - Variable(all of the above)

8. What are the two generic methods to eliminate static electricity from metal objects?
Porcelain
Electromagnetism
Bonding and grounding
American wire gauge(AWG)

9. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Breakdown voltage
Alternating current
Mutual induction

10. What does a first band of white mean?
Resistance increases as the conductor length increases
Heat
First digit is 9
Insulation resistance

11. What are the common units of measurement for round and square conductor cross - sections?
The relationship of potential difference to current
Circular and square mills(Both A and B)
Relay
Current change in a coil creates a magnetic change

12. What is dielectric strength?
Potential difference
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
How much potential difference can a material withstand before breaking down
Relationship between current and potential difference

13. Which type of cell can be recharged?
The rate of doing work
Potential difference
Secondary cell
Fixed - tapped - variable(all of the above)

14. What is a property of inductors in electrical circuits?
Mutual induction
Wire splices
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Opposes any change in the current flowing in a circuit

15. What results when current is run through a material with high resistance?
Unlike poles attract
Heat and current control(both a and c)
Insulation resistance and Dielectric strength(Both A and B)
The relationship of potential difference to current

16. What is a characteristic of a fixed resistor?
Composition of the resistor
Resistance value can not be changed
Choke
10

17. What do junction boxes protect?
First digit is 9
Solenoid and Relay(both A and B)
Cables
Wire splices

18. What type of circuit has two or more paths for current to follow?
Parallel circuit
Parallel
Heat
First digit

19. To what measurement do the conductor mills refer?
1/1000th of an inch
Tolerence
High resistance
First digit is 9

20. What is the use of the electromagnet?
Solenoid and Relay(both A and B)
Amperes
Gauge number
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

21. What is another name for an inductor?
75 Ohms
Choke
Cells can be connected together to make a battery
Plastic - Rubber - Friction(all of the above)

22. What is the purpose of capacitors in electrical circuits?
Opposes any change in the current flowing in a circuit
Stores electrical charge
High resistance
Purging

23. What is the purpose of a raceway?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Choke
First digit
Secondary cell

24. What is the relationship between cells and batteries?
Ohms
Cells can be connected together to make a battery
Bonding and grounding
The direction the negative charge moves

25. What does Ohm's Law represent?
Heat
Relationship between current and potential difference
From the negative battery terminal to the positive terminal
Start with the band on the end and read to the center

26. What wire measurement is commonly used in the U.S.?
Battery
How much potential difference can a material withstand before breaking down
American wire gauge(AWG)
Heat

27. What is the term for two or more cells attached together?
Purging
Parallel
Fixed - Electrolytic - Variable(all of the above)
Battery

28. What is a type of capacitor?
High resistance
Fixed - Electrolytic - Variable(all of the above)
A difference in potential energy
Produce heat - light - or limit current to control it(all of the above)

29. What is insulation resistance?
Magnetic properties
Potential difference - E*I - current times current change from point to point(all of the above)
Electrical resistance against the flow of current
Two

30. Identify the general blueprint symbol for inductors.
Potential difference
1/1000th of an inch
Symbol
Opposition to electrical current

31. What is resistance?
Opposition to movement of free electrons
Bonding and grounding
1 watt
--^V^V^V^---

32. How is capacitance determined?
Grounding wire
Voltage
Area and spacing of capacitor - static current in the capacitor(both A and B)
American wire gauge(AWG)

33. Which material has the lowest resistance at ordinary temperatures?
Potential difference - E*I - current times current change from point to point(all of the above)
Heat and current control(both a and c)
Silver
Fixed - Electrolytic - Variable(all of the above)

34. What does an object have if a magnetic field acts on it?
Bonding and grounding
Magnetic properties
DC current
Insulation resistance and Dielectric strength(Both A and B)

35. What is a DC circuit characteristic?
From the negative battery terminal to the positive terminal
Potential difference
Current flows in one direction - potential differences across a load does not change(Both A and B)
Bare - covered - insulated - stranded - cable(All of the above)

36. What is the basic law of magnetic force?
Unlike poles attract
Opposition to electrical current
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
The rate of doing work

37. What does static electricity do?
Parallel circuit
Start with the band on the end and read to the center
Does not move
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

38. Identify the blueprint symbol for capacitors.
Volts
Symbol
Opposition to electrical current
10%

39. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Common - not rechargable - gradually discharges when in storage(All of the above)
Resistance increases as the conductor length increases
Voltmeter
50 Ohms

40. What is voltage?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Resistance value can not be changed
Plastic - Rubber - Friction(all of the above)
A difference in potential energy

41. What is a characteristic of insulators?
Potential difference - E*I - current times current change from point to point(all of the above)
Series circuit
First digit is 9
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

42. What information do the Left-Hand Rules provide?
Grounding wire
Volts
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Relationship between current and potential difference

43. What is a common form used in conductors?
Moving vehicles
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Cables
Alternating current

44. What is the measure of potential difference?
Series circuit
Volts
Stores electrical charge
10

45. What is the unit of measurement of resistance?
Choke
Ohms
Potential difference
Tolerence

46. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Voltage
Serial
20%
Choke

47. What is the type of cable composed of many fine wires?
Stranded
Wire splices
Alternating current
How much potential difference can a material withstand before breaking down

48. What is a wire classification?
American wire gauge(AWG)
Plastic - Rubber - Friction(all of the above)
Bare - covered - insulated - stranded - cable(All of the above)
Strength of the charge

49. A resistor is color coded brown - green - orange. What is its resistance?
15 -000 ohms - 20%
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)
How much potential difference can a material withstand before breaking down

50. What determines the resistance of a resistor?
Composition of the resistor
Chemical action - electromagnetism - contact - heat - light - deformation(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)
Electrical resistance against the flow of current