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 is the name for electrical resistance of insulation?
Start with the band on the end and read to the center
Symbol
Insulation resistance
Grounding wire

2. A resistor is color coded brown - green - orange. What is its resistance?
DC current
Potential difference
15 -000 ohms - 20%
Silver

3. What is the term for two or more cells attached together?
20%
Heat
Battery
Voltage

4. What do junction boxes protect?
Wire splices
Potential difference
Breakdown voltage
Does not move

5. 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
12 volts
Electromagnetic field
Current change in a coil creates a magnetic change
Volts

6. What is the purpose of a raceway?
Opposes any change in the current flowing in a circuit
Opposition to electrical current
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Breakdown voltage

7. What is a common form used in conductors?
Heat and current control(both a and c)
Stores electrical charge
75 Ohms
Cables

8. What is a type of mechanical transducer?
Electromagnetic field
Parallel circuit
Solenoid and Relay(both A and B)
15 -000 ohms - 20%

9. What do transducers do in electrical terms?
Use an effect to produce another effect
Potential difference - E*I - current times current change from point to point(all of the above)
Electromagnetic field
First digit is 9

10. What is another name for an inductor?
50 Ohms
Choke
Moving vehicles
Current flows in one direction - potential differences across a load does not change(Both A and B)

11. What is the relationship of conductor size and length to resistance?
Secondary cell
Unlike poles attract
Resistance increases as the conductor length increases
Produce heat - light - or limit current to control it(all of the above)

12. What instrument measures voltage?
Voltmeter
Volts
Area and spacing of capacitor - static current in the capacitor(both A and B)
The direction the negative charge moves

13. What wire measurement is commonly used in the U.S.?
5%
Start with the band on the end and read to the center
American wire gauge(AWG)
Resistance increases as the conductor length increases

14. When does a DC circuit oppose current flow?
Moving vehicles
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
75 Ohms
First digit is 9

15. What is a switch that operates by electricity?
Potential difference
Relay
Grounding wire
Breakdown voltage

16. What is needed for electric heating elements and the filaments of light bulbs?
High resistance
Heat
Purging
Series circuit

17. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Bonding and grounding
The direction the negative charge moves
High resistance
Serial

18. What do we call the ability to do work?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Energy
Potential difference
Relay

19. What does a third band of brown mean?
10
Opposition to electrical current
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

20. What determines the resistance of a resistor?
Composition of the resistor
Potential difference
Silver
A difference in potential energy

21. What is a common measure of wire diameter?
Insulation resistance and Dielectric strength(Both A and B)
Gauge number
Current flows in one direction - potential differences across a load does not change(Both A and B)
Start with the band on the end and read to the center

22. Identify the blueprint symbol for capacitors.
Wire splices
Symbol
Volts
First digit

23. Which type of cell can be recharged?
Secondary cell
75 Ohms
Opposition to electrical current
Cell

24. What is the unit of measurement of potential difference?
The rate of doing work
Two
Volts
DC flows continuously in one direction and AC potential difference and current both change direction

25. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Cell
Solenoid and Relay(both A and B)
Voltage
Magnetic properties

26. Which way is the current going in the circuit shown?(electron flow)
From the negative battery terminal to the positive terminal
Resistance value can not be changed
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Bonding and grounding

27. Where does the thumb point in both Left-Hand Rules?
From the negative battery terminal to the positive terminal
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
The direction the negative charge moves
Resistance value can not be changed

28. What are the names of two of the six primary methods of producing a voltage?
Serial
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
How much potential difference can a material withstand before breaking down
The direction the negative charge moves

29. 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)
First digit
12 volts
Current flows in one direction - potential differences across a load does not change(Both A and B)

30. What is a wire classification?
Strength of the charge
Bare - covered - insulated - stranded - cable(All of the above)
By their covering
Choke

31. What is a type of capacitor?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Fixed - Electrolytic - Variable(all of the above)
A difference in potential energy
Opposes any change in the current flowing in a circuit

32. What is the purpose of resistors in electrical circuits?
Amperes
Ability to store an electric charge
Produce heat - light - or limit current to control it(all of the above)
Solenoid and Relay(both A and B)

33. What is a DC circuit characteristic?
Fixed - Electrolytic - Variable(all of the above)
Potential difference
Current flows in one direction - potential differences across a load does not change(Both A and B)
Composition of the resistor

34. How is capacitance determined?
A difference in potential energy
DC current
Area and spacing of capacitor - static current in the capacitor(both A and B)
High resistance

35. How do static charges distribute themselves?
Mutual induction
Solenoid and Relay(both A and B)
Does not move
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

36. Identify the blueprint symbol for resistors.
Relationship between current and potential difference
--^V^V^V^---
DC current
Symbol

37. What is an electromagnet?
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
The direction the negative charge moves
Heat

38. How do you read resistor color codes?
Circular and square mills(Both A and B)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Start with the band on the end and read to the center
Chemical action

39. What information do the Left-Hand Rules provide?
DC flows continuously in one direction and AC potential difference and current both change direction
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Breakdown voltage
Resistance increases as the conductor length increases

40. What is the purpose of capacitors in electrical circuits?
1/1000th of an inch
Opposes any change in the current flowing in a circuit
Stores electrical charge
Heat

41. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
75 Ohms
Parallel circuit
5%
Use an effect to produce another effect

42. What determines whether a spark can be produced?
Resistance value can not be changed
Strength of the charge
Unlike poles attract
First digit

43. Where do the fingers point in both Left-Hand Rules?
First digit
The direction of the magnetic field
Use an effect to produce another effect
Heat

44. What results when current is run through a material with high resistance?
Insulation resistance
First digit
Heat and current control(both a and c)
Alternating current

45. Which of the following is a type of resistor?
Insulation resistance
Fixed - tapped - variable(all of the above)
Porcelain
Common - not rechargable - gradually discharges when in storage(All of the above)

46. What does a moving charge produce?
Composition of the resistor
Alternating current
A magnetic field
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

47. The thermocouple uses which method for creating potential energy?
Common - not rechargable - gradually discharges when in storage(All of the above)
Heat
DC flows continuously in one direction and AC potential difference and current both change direction
5%

48. What is resistance?
Heat
First digit
Opposition to movement of free electrons
Electromagnetic field

49. When reading resistance color codes - what does the fourth band indicate?
Parallel circuit
Tolerence
Breakdown voltage
Electrical resistance against the flow of current

50. What makes electrons flow?
Potential difference
Wire splices
Relationship between current and potential difference
Composition of the resistor