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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. What cannot be transformed to higher or lower potential differences?
Parallel
The relationship of potential difference to current
Heat
DC current

2. What do junction boxes protect?
Opposition to movement of free electrons
Wire splices
75 Ohms
A magnetic field

3. What instrument measures voltage?
Voltmeter
High resistance
First digit
1 watt

4. What can permanently break down a capacitor?
Voltage
Series circuit
Insulation resistance
Breakdown voltage

5. What must be large enough to carry the largest current likely to occur?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Parallel circuit
Grounding wire
Magnetic properties

6. The thermocouple uses which method for creating potential energy?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Cables
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)
Heat

7. What is dielectric strength?
15 -000 ohms - 20%
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)
How much potential difference can a material withstand before breaking down
75 Ohms

8. What is insulation resistance?
Electrical resistance against the flow of current
Wire splices
The direction of the magnetic field
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

9. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
DC current
Produce heat - light - or limit current to control it(all of the above)
Mutual induction
Parallel

10. What is the name for electrical resistance of insulation?
Volts
Insulation resistance
From the negative battery terminal to the positive terminal
Opposition to electrical current

11. When does a DC circuit oppose current flow?
Start with the band on the end and read to the center
Stores electrical charge
Heat and current control(both a and c)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

12. Where do the fingers point in both Left-Hand Rules?
The direction of the magnetic field
Insulation resistance
Parallel
Stranded

13. What is an arrangement of materials that create a potential difference by chemistry?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Fixed - tapped - variable(all of the above)
Cell
Grounding wire

14. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Gauge number
The direction of the magnetic field
Alternating current
Potential difference

15. What is a way to classify wires and cables?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
By their covering
Cell
Opposition to electrical current

16. What is the purpose of capacitors in electrical circuits?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Stores electrical charge
Volts
Relationship between current and potential difference

17. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Voltage
First digit
How much potential difference can a material withstand before breaking down
Potential difference

18. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Serial
Series circuit
5%
Unlike poles attract

19. What is the basic law of magnetic force?
Solenoid and Relay(both A and B)
Cables
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Unlike poles attract

20. What is a conductor?
Solenoid and Relay(both A and B)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
10%

21. How many kinds of poles do magnets have?
Battery
Volts
Two
Does not move

22. The dry cell is what method for creating potential energy?
Insulation resistance and Dielectric strength(Both A and B)
Use an effect to produce another effect
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Chemical action

23. What types of protective tapes are used?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Plastic - Rubber - Friction(all of the above)
By their covering
Voltage

24. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
Gauge number
5%
Volts

25. What is another name for an inductor?
Choke
--^V^V^V^---
Fixed - tapped - variable(all of the above)
From the negative battery terminal to the positive terminal

26. What is a wire classification?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
1/1000th of an inch
Alternating current
Bare - covered - insulated - stranded - cable(All of the above)

27. What type of circuit has one path of follow through a load?
Unlike poles attract
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Series circuit
From the negative battery terminal to the positive terminal

28. What makes electrons flow?
Potential difference
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Purging
Strength of the charge

29. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
Plastic - Rubber - Friction(all of the above)
The direction the negative charge moves
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

30. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Potential difference - E*I - current times current change from point to point(all of the above)
Purging

31. What is resistance?
Wire splices
Opposition to movement of free electrons
Ohms
Fixed - tapped - variable(all of the above)

32. What information do the Left-Hand Rules provide?
Produce heat - light - or limit current to control it(all of the above)
Heat
Energy
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

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
15 -000 ohms - 20%
12 volts
Opposition to movement of free electrons
Bare - covered - insulated - stranded - cable(All of the above)

34. Identify the general blueprint symbol for inductors.
Symbol
Current flows in one direction - potential differences across a load does not change(Both A and B)
Does not move
Fixed - Electrolytic - Variable(all of the above)

35. What is capacitance in electrical terms?
Wire splices
Unlike poles attract
Relay
Ability to store an electric charge

36. To what measurement do the conductor mills refer?
Resistance value can not be changed
1/1000th of an inch
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Cables

37. What do we call the ability to do work?
10
Energy
Symbol
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

38. What makes electrons flow?
Symbol
Moving vehicles
Potential difference
A magnetic field

39. What do transducers do in electrical terms?
Parallel circuit
A magnetic field
Use an effect to produce another effect
Heat and current control(both a and c)

40. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
1 watt
Produce heat - light - or limit current to control it(all of the above)
50 Ohms
Common - not rechargable - gradually discharges when in storage(All of the above)

41. What wire measurement is commonly used in the U.S.?
Series circuit
First digit
Strength of the charge
American wire gauge(AWG)

42. What is an electromagnet?
A magnetic field
The rate of doing work
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
A difference in potential energy

43. What is the type of cable composed of many fine wires?
Voltage
Stranded
The rate of doing work
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

44. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
DC current
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Cables

45. What are the names of two of the six primary methods of producing a voltage?
The relationship of potential difference to current
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Voltage
Amperes

46. What is the purpose of a raceway?
Gauge number
75 Ohms
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Moving vehicles

47. What is a common measure of wire diameter?
Battery
Electromagnetism
Gauge number
Relay

48. What is the fundamental property of insulators?
Stores electrical charge
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
DC current
Insulation resistance and Dielectric strength(Both A and B)

49. Which material has the lowest resistance at ordinary temperatures?
Symbol
Relationship between current and potential difference
Silver
Resistance value can not be changed

50. What does a third band of brown mean?
1 watt
10
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)