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. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Series circuit
Common - not rechargable - gradually discharges when in storage(All of the above)
20%
Wire splices

2. What is the term for doing work at the rate of joule per second?
1 watt
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)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Symbol

3. Identify the blueprint symbol for resistors.
Volts
75 Ohms
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
--^V^V^V^---

4. What is a common cause of static electricity in a shop?
By their covering
Moving vehicles
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
1/1000th of an inch

5. Identify the blueprint symbol for capacitors.
12 volts
15 -000 ohms - 20%
Symbol
First digit is 9

6. What type of circuit has two or more paths for current to follow?
A magnetic field
Grounding wire
Parallel
Parallel circuit

7. How do static charges distribute themselves?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Volts
Resistance increases as the conductor length increases

8. Which material has the lowest resistance at ordinary temperatures?
A magnetic field
10%
Magnetic properties
Silver

9. What is power?
Cables
Electromagnetic field
The rate of doing work
Secondary cell

10. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Composition of the resistor
50 Ohms
Common - not rechargable - gradually discharges when in storage(All of the above)

11. Which of the following materials is NOT a good conductor?
A difference in potential energy
DC flows continuously in one direction and AC potential difference and current both change direction
Cables
Porcelain

12. What do transducers do in electrical terms?
Use an effect to produce another effect
1/1000th of an inch
Wire splices
Opposition to movement of free electrons

13. What is the name for electrical resistance of insulation?
Relationship between current and potential difference
Insulation resistance
Circular and square mills(Both A and B)
Chemical action

14. What makes electrons flow?
Ohms
The direction of the magnetic field
Potential difference
Electrical resistance against the flow of current

15. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
Relay
Grounding wire
Parallel

16. How many kinds of poles do magnets have?
Mutual induction
Ability to store an electric charge
Two
Chemical action

17. What makes electrons flow?
Electromagnetic field
Wire splices
Potential difference
Heat

18. What is a way to classify wires and cables?
Plastic - Rubber - Friction(all of the above)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
By their covering
Heat

19. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Voltage
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Relay
Produce heat - light - or limit current to control it(all of the above)

20. What is the purpose of resistors in electrical circuits?
High resistance
Electrical resistance against the flow of current
Produce heat - light - or limit current to control it(all of the above)
Tolerence

21. What does a third band of brown mean?
10
Solenoid and Relay(both A and B)
Bare - covered - insulated - stranded - cable(All of the above)
Unlike poles attract

22. The generator is what method of creating potential energy?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Common - not rechargable - gradually discharges when in storage(All of the above)
Electromagnetism
Bare - covered - insulated - stranded - cable(All of the above)

23. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Amperes
Mutual induction
Heat
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

24. What does static electricity do?
1 watt
5%
Energy
Does not move

25. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
Breakdown voltage
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
15 -000 ohms - 20%

26. A resistor is color coded brown - green - orange. What is its resistance?
15 -000 ohms - 20%
1/1000th of an inch
Produce heat - light - or limit current to control it(all of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)

27. What does a transformer transform?
Current change in a coil creates a magnetic change
Unlike poles attract
The relationship of potential difference to current
Series circuit

28. What is 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)
Relationship between current and potential difference
Current change in a coil creates a magnetic change
Parallel

29. What wire measurement is commonly used in the U.S.?
Porcelain
Heat
DC current
American wire gauge(AWG)

30. Which type of cell can be recharged?
Volts
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Secondary cell
Magnetic properties

31. Identify the general blueprint symbol for inductors.
Grounding wire
Symbol
Composition of the resistor
A magnetic field

32. What is the relationship between cells and batteries?
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)
Opposes any change in the current flowing in a circuit
Cells can be connected together to make a battery

33. What is the relationship of conductor size and length to resistance?
Opposition to electrical current
5%
DC flows continuously in one direction and AC potential difference and current both change direction
Resistance increases as the conductor length increases

34. What is a switch that operates by electricity?
12 volts
Relay
High resistance
Composition of the resistor

35. What instrument measures voltage?
Voltmeter
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)
Electromagnetism
Produce heat - light - or limit current to control it(all of the above)

36. What is a conductor?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Two
Stranded
Porcelain

37. How is the heat production measured in a resistor?
Voltage
Potential difference - E*I - current times current change from point to point(all of the above)
Potential difference
Amperes

38. What is a characteristic of a fixed resistor?
--^V^V^V^---
From the negative battery terminal to the positive terminal
Insulation resistance
Resistance value can not be changed

39. What is the use of the electromagnet?
Does not move
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Volts
12 volts

40. Which of the following is a type of resistor?
Electrical resistance against the flow of current
Fixed - tapped - variable(all of the above)
How much potential difference can a material withstand before breaking down
Heat

41. Where does the thumb point in both Left-Hand Rules?
Porcelain
15 -000 ohms - 20%
The direction the negative charge moves
Strength of the charge

42. How is capacitance determined?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Series circuit
High resistance

43. What is the measure of potential difference?
Volts
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Cell
A magnetic field

44. What is voltage?
A difference in potential energy
Cell
Potential difference - E*I - current times current change from point to point(all of the above)
First digit is 9

45. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Alternating current
DC flows continuously in one direction and AC potential difference and current both change direction
--^V^V^V^---
Electromagnetic field

46. What is the relationship between magnetism and electricity?
First digit is 9
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)
Moving vehicles
Wire splices

47. What is the term for two or more cells attached together?
Battery
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)
Common - not rechargable - gradually discharges when in storage(All of the above)
Bare - covered - insulated - stranded - cable(All of the above)

48. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Heat
Serial
Cell
Stranded

49. How do you read resistor color codes?
From the negative battery terminal to the positive terminal
The direction the negative charge moves
Start with the band on the end and read to the center
Amperes

50. What types of protective tapes are used?
10%
Plastic - Rubber - Friction(all of the above)
The relationship of potential difference to current
Mutual induction