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. Which type of cell can be recharged?
Parallel
10%
Secondary cell
Current flows in one direction - potential differences across a load does not change(Both A and B)

2. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Voltage
Silver
10%

3. What cannot be transformed to higher or lower potential differences?
Opposition to movement of free electrons
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Potential difference - E*I - current times current change from point to point(all of the above)
DC current

4. Identify the general blueprint symbol for inductors.
Opposition to movement of free electrons
Alternating current
Tolerence
Symbol

5. The generator is what method of creating potential energy?
Electromagnetism
The direction the negative charge moves
Silver
Gauge number

6. What are the names of two of the six primary methods of producing a voltage?
Breakdown voltage
Bare - covered - insulated - stranded - cable(All of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)

7. What instrument measures voltage?
By their covering
Voltmeter
High resistance
Relationship between current and potential difference

8. What does a moving charge produce?
10
A magnetic field
Potential difference
Relationship between current and potential difference

9. When reading resistance color codes - what does the first band indicate?
Silver
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
American wire gauge(AWG)
First digit

10. Which material has the lowest resistance at ordinary temperatures?
Silver
Circular and square mills(Both A and B)
Cell
Relationship between current and potential difference

11. What does static electricity do?
Mutual induction
Does not move
The direction the negative charge moves
By their covering

12. Identify the blueprint symbol for capacitors.
Magnetic properties
Symbol
Amperes
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)

13. What does resistance produce?
Battery
Heat
Two
1/1000th of an inch

14. What is power?
The rate of doing work
Strength of the charge
20%
A difference in potential energy

15. What can permanently break down a capacitor?
Symbol
Current change in a coil creates a magnetic change
Breakdown voltage
Potential difference - E*I - current times current change from point to point(all of the above)

16. What is the relationship between cells and batteries?
Cells can be connected together to make a battery
Gauge number
High resistance
Resistance increases as the conductor length increases

17. What is the difference between AC and DC?
10%
DC flows continuously in one direction and AC potential difference and current both change direction
Energy
Fixed - Electrolytic - Variable(all of the above)

18. What makes electrons flow?
5%
Resistance value can not be changed
Bonding and grounding
Potential difference

19. What is induction?
Current change in a coil creates a magnetic change
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)
Symbol
Voltmeter

20. What is a type of mechanical transducer?
Solenoid and Relay(both A and B)
Stores electrical charge
Unlike poles attract
Secondary cell

21. What determines the resistance of a resistor?
DC flows continuously in one direction and AC potential difference and current both change direction
First digit is 9
Solenoid and Relay(both A and B)
Composition of the resistor

22. What must be large enough to carry the largest current likely to occur?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Opposition to movement of free electrons
Heat and current control(both a and c)
Grounding wire

23. How do you read resistor color codes?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Voltage
75 Ohms
Start with the band on the end and read to the center

24. What is the name for electrical resistance of insulation?
Insulation resistance
Potential difference - E*I - current times current change from point to point(all of the above)
Opposes any change in the current flowing in a circuit
From the negative battery terminal to the positive terminal

25. What do we call the ability to do work?
Start with the band on the end and read to the center
Cells can be connected together to make a battery
Area and spacing of capacitor - static current in the capacitor(both A and B)
Energy

26. What does a third band of brown mean?
10
By their covering
American wire gauge(AWG)
Heat

27. Which of the following materials is NOT a good conductor?
Porcelain
Insulation resistance
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Does not move

28. What is the fundamental property of insulators?
Insulation resistance
Insulation resistance and Dielectric strength(Both A and B)
Stores electrical charge
A magnetic field

29. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Magnetic properties
1 watt
Silver
Voltage

30. What do junction boxes protect?
Wire splices
Fixed - tapped - variable(all of the above)
Relationship between current and potential difference
Fixed - Electrolytic - Variable(all of the above)

31. What are the two generic methods to eliminate static electricity from metal objects?
DC flows continuously in one direction and AC potential difference and current both change direction
Alternating current
Bonding and grounding
Symbol

32. What does Ohm's Law represent?
Relationship between current and potential difference
Serial
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
First digit is 9

33. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Parallel circuit
Bare - covered - insulated - stranded - cable(All of the above)
20%
1 watt

34. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Solenoid and Relay(both A and B)
10%
Relationship between current and potential difference
The direction of the magnetic field

35. How many kinds of poles do magnets have?
1 watt
Composition of the resistor
Two
Electrical resistance against the flow of current

36. What is a way to classify wires and cables?
1/1000th of an inch
Stranded
By their covering
Grounding wire

37. What is dielectric strength?
Strength of the charge
Cell
By their covering
How much potential difference can a material withstand before breaking down

38. What do transducers do in electrical terms?
Use an effect to produce another effect
Tolerence
Area and spacing of capacitor - static current in the capacitor(both A and B)
Current flows in one direction - potential differences across a load does not change(Both A and B)

39. What is a common cause of static electricity in a shop?
10%
DC flows continuously in one direction and AC potential difference and current both change direction
Parallel
Moving vehicles

40. What is resistance in electrical terms?
Opposition to electrical current
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Heat
Electromagnetic field

41. What is a property of inductors in electrical circuits?
Parallel circuit
Opposes any change in the current flowing in a circuit
The rate of doing work
Tolerence

42. What is the purpose of a raceway?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Circular and square mills(Both A and B)
Heat and current control(both a and c)
High resistance

43. What is the use of the electromagnet?
DC current
Common - not rechargable - gradually discharges when in storage(All of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Insulation resistance and Dielectric strength(Both A and B)

44. What is a conductor?
Purging
Amperes
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
20%

45. Where does the thumb point in both Left-Hand Rules?
The direction of the magnetic field
Series circuit
Plastic - Rubber - Friction(all of the above)
The direction the negative charge moves

46. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
Serial
Tolerence
20%

47. Given R=E / I and the following information - plug in the data and solve the problem for resistance. 1.5 volt walkman battery - 0.02 amps of current
Area and spacing of capacitor - static current in the capacitor(both A and B)
Tolerence
75 Ohms
A difference in potential energy

48. What is the term for doing work at the rate of joule per second?
1 watt
Heat
Cells can be connected together to make a battery
10

49. What makes electrons flow?
Potential difference
Purging
5%
Series circuit

50. A resistor is color coded brown - green - orange. What is its resistance?
--^V^V^V^---
Fixed - Electrolytic - Variable(all of the above)
Stranded
15 -000 ohms - 20%