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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 dielectric strength?
12 volts
How much potential difference can a material withstand before breaking down
Grounding wire
Symbol

2. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Gauge number
Strength of the charge
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Mutual induction

3. What is a type of mechanical transducer?
Electromagnetism
Solenoid and Relay(both A and B)
Mutual induction
Moving vehicles

4. What is capacitance in electrical terms?
Opposition to movement of free electrons
Ability to store an electric charge
Battery
The relationship of potential difference to current

5. What does a moving charge produce?
A magnetic field
Cells can be connected together to make a battery
Opposition to movement of free electrons
Magnetic properties

6. How is capacitance determined?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)
By their covering
High resistance

7. What do we call the ability to do work?
By their covering
Energy
Does not move
75 Ohms

8. What is resistance?
Potential difference
DC flows continuously in one direction and AC potential difference and current both change direction
Series circuit
Opposition to movement of free electrons

9. In most applications - what remains constant if the current remains constant and flows in one direction?
Strength of the charge
Electromagnetic field
Ohms
20%

10. What is the term for doing work at the rate of joule per second?
1 watt
A magnetic field
The relationship of potential difference to current
Insulation resistance

11. What must be large enough to carry the largest current likely to occur?
Opposition to movement of free electrons
Secondary cell
Grounding wire
Cell

12. What does a third band of brown mean?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Moving vehicles
High resistance
10

13. What is the relationship between cells and batteries?
Bonding and grounding
75 Ohms
Silver
Cells can be connected together to make a battery

14. What is the difference between AC and DC?
DC flows continuously in one direction and AC potential difference and current both change direction
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Opposes any change in the current flowing in a circuit
Choke

15. What is the measure of potential difference?
Volts
Bare - covered - insulated - stranded - cable(All of the above)
Common - not rechargable - gradually discharges when in storage(All of the above)
Resistance value can not be changed

16. What is the fundamental property of insulators?
Purging
Insulation resistance and Dielectric strength(Both A and B)
Opposition to movement of free electrons
Heat

17. What is insulation resistance?
Electrical resistance against the flow of current
Grounding wire
Battery
Opposition to electrical current

18. What is a DC circuit characteristic?
Tolerence
Relationship between current and potential difference
High resistance
Current flows in one direction - potential differences across a load does not change(Both A and B)

19. Which material has the lowest resistance at ordinary temperatures?
Silver
10
Alternating current
--^V^V^V^---

20. What is a property of inductors in electrical circuits?
Voltage
Produce heat - light - or limit current to control it(all of the above)
Opposes any change in the current flowing in a circuit
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

21. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Common - not rechargable - gradually discharges when in storage(All of the above)
50 Ohms
20%
Electromagnetism

22. What does a transformer transform?
The relationship of potential difference to current
DC current
The rate of doing work
Gauge number

23. Identify the blueprint symbol for capacitors.
Ability to store an electric charge
Symbol
10%
DC current

24. What makes electrons flow?
Potential difference
Bonding and grounding
15 -000 ohms - 20%
5%

25. What determines whether a spark can be produced?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Cells can be connected together to make a battery
Heat and current control(both a and c)
Strength of the charge

26. How do you read resistor color codes?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Bonding and grounding
Start with the band on the end and read to the center
10

27. A resistor is color coded brown - green - orange. What is its resistance?
15 -000 ohms - 20%
Electromagnetism
Current flows in one direction - potential differences across a load does not change(Both A and B)
Ability to store an electric charge

28. What is a type of capacitor?
Relay
Use an effect to produce another effect
Fixed - Electrolytic - Variable(all of the above)
Solenoid and Relay(both A and B)

29. What is a switch that operates by electricity?
Relay
Potential difference
Mutual induction
Opposition to electrical current

30. What is the unit of measurement of electrical current?
First digit is 9
50 Ohms
Amperes
Grounding wire

31. What is true about a dry cell?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(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)
75 Ohms
Common - not rechargable - gradually discharges when in storage(All of the above)

32. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Current change in a coil creates a magnetic change
Choke
10%
Circular and square mills(Both A and B)

33. What is the purpose of capacitors in electrical circuits?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Bare - covered - insulated - stranded - cable(All of the above)
Stores electrical charge
Potential difference - E*I - current times current change from point to point(all of the above)

34. What do junction boxes protect?
Wire splices
Stranded
Heat and current control(both a and c)
American wire gauge(AWG)

35. What determines the resistance of a resistor?
Fixed - tapped - variable(all of the above)
Composition of the resistor
First digit is 9
Energy

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

37. What is the relationship of conductor size and length to resistance?
Resistance increases as the conductor length increases
Stranded
Battery
Does not move

38. What makes electrons flow?
Parallel
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Stranded
Potential difference

39. What do electrical charges need to cause a fire or explosion?
Volts
Series circuit
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)

40. What is the unit of measurement of potential difference?
Volts
Magnetic properties
Two
Heat

41. Which of the following is a type of resistor?
Fixed - tapped - variable(all of the above)
20%
Bonding and grounding
Voltage

42. What is a common cause of static electricity in a shop?
Heat
Moving vehicles
The rate of doing work
A difference in potential energy

43. Which type of cell can be recharged?
Moving vehicles
First digit is 9
Secondary cell
Common - not rechargable - gradually discharges when in storage(All of the above)

44. What is a common form used in conductors?
Grounding wire
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Circular and square mills(Both A and B)
Cables

45. The generator is what method of creating potential energy?
Bare - covered - insulated - stranded - cable(All of the above)
Potential difference
Ability to store an electric charge
Electromagnetism

46. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
5%
DC current
Magnetic properties
Serial

47. Which of the following materials is NOT a good conductor?
Porcelain
Two
Relationship between current and potential difference
First digit is 9

48. 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
Current change in a coil creates a magnetic change
Heat and current control(both a and c)
12 volts
Relay

49. What types of protective tapes are used?
Plastic - Rubber - Friction(all of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Current change in a coil creates a magnetic change
10%

50. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Serial
5%
50 Ohms
Voltage