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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 a conductor?
Resistance increases as the conductor length increases
Bonding and grounding
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Ohms

2. What instrument measures voltage?
Bare - covered - insulated - stranded - cable(All of the above)
Opposes any change in the current flowing in a circuit
Voltmeter
Ohms

3. The thermocouple uses which method for creating potential energy?
Does not move
75 Ohms
Symbol
Heat

4. What is a way to classify wires and cables?
First digit is 9
By their covering
Parallel
Solenoid and Relay(both A and B)

5. To what measurement do the conductor mills refer?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Mutual induction
1/1000th of an inch
Resistance increases as the conductor length increases

6. Identify the blueprint symbol for resistors.
15 -000 ohms - 20%
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
--^V^V^V^---
Porcelain

7. What is resistance?
Resistance value can not be changed
Insulation resistance and Dielectric strength(Both A and B)
Electromagnetic field
Opposition to movement of free electrons

8. When does a DC circuit oppose current flow?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Mutual induction
Silver
10%

9. Identify the blueprint symbol for capacitors.
Volts
How much potential difference can a material withstand before breaking down
Symbol
Heat

10. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
A magnetic field
Secondary cell
Amperes
Voltage

11. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
A difference in potential energy
Purging
Voltmeter
Opposition to electrical current

12. What makes electrons flow?
Alternating current
Amperes
Symbol
Potential difference

13. What is a common cause of static electricity in a shop?
Composition of the resistor
Solenoid and Relay(both A and B)
Moving vehicles
DC flows continuously in one direction and AC potential difference and current both change direction

14. 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
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
How much potential difference can a material withstand before breaking down
12 volts
Parallel

15. Identify the general blueprint symbol for inductors.
The relationship of potential difference to current
Symbol
Circular and square mills(Both A and B)
Bare - covered - insulated - stranded - cable(All of the above)

16. What is dielectric strength?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Stores electrical charge
Series circuit
How much potential difference can a material withstand before breaking down

17. What is a common form used in conductors?
Cables
Fixed - tapped - variable(all of the above)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Cells can be connected together to make a battery

18. What is voltage?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Porcelain
Relationship between current and potential difference
A difference in potential energy

19. Which material has the lowest resistance at ordinary temperatures?
The relationship of potential difference to current
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Silver
The direction the negative charge moves

20. What determines whether a spark can be produced?
Current change in a coil creates a magnetic change
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Strength of the charge
Electromagnetic field

21. What is the purpose of capacitors in electrical circuits?
Volts
Battery
1 watt
Stores electrical charge

22. What is capacitance in electrical terms?
Opposition to movement of free electrons
Volts
Ability to store an electric charge
Heat

23. The dry cell is what method for creating potential energy?
The relationship of potential difference to current
Circular and square mills(Both A and B)
Start with the band on the end and read to the center
Chemical action

24. A resistor is color coded brown - green - orange. What is its resistance?
Use an effect to produce another effect
Composition of the resistor
10%
15 -000 ohms - 20%

25. What does a third band of brown mean?
The direction the negative charge moves
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
10
Symbol

26. What is the difference between AC and DC?
American wire gauge(AWG)
Moving vehicles
Voltage
DC flows continuously in one direction and AC potential difference and current both change direction

27. What is the purpose of a raceway?
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)
Cables
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Tolerence

28. What is a characteristic of insulators?
Volts
The rate of doing work
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Use an effect to produce another effect

29. When reading resistance color codes - what does the first band indicate?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
First digit
Current flows in one direction - potential differences across a load does not change(Both A and B)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

30. The generator is what method of creating potential energy?
Electromagnetism
Bonding and grounding
Use an effect to produce another effect
First digit

31. What is the use of the electromagnet?
5%
Moving vehicles
Plastic - Rubber - Friction(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(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?
Fixed - Electrolytic - Variable(all of the above)
Symbol
10%
Stranded

33. What is the unit of measurement of electrical current?
Amperes
High resistance
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

34. What is the relationship of conductor size and length to resistance?
Electrical resistance against the flow of current
Resistance increases as the conductor length increases
First digit
Current change in a coil creates a magnetic change

35. How many kinds of poles do magnets have?
Two
Mutual induction
Use an effect to produce another effect
Insulation resistance

36. How is capacitance determined?
Composition of the resistor
DC flows continuously in one direction and AC potential difference and current both change direction
Magnetic properties
Area and spacing of capacitor - static current in the capacitor(both A and B)

37. What is induction?
First digit is 9
Magnetic properties
Current change in a coil creates a magnetic change
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

38. What is power?
1 watt
Purging
Produce heat - light - or limit current to control it(all of the above)
The rate of doing work

39. What does Ohm's Law represent?
Choke
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
A magnetic field
Relationship between current and potential difference

40. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Energy
Plastic - Rubber - Friction(all of the above)
Serial
5%

41. What makes electrons flow?
Potential difference
High resistance
Circular and square mills(Both A and B)
Purging

42. What is the term for doing work at the rate of joule per second?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Moving vehicles
1 watt
High resistance

43. What does static electricity do?
Volts
Does not move
Produce heat - light - or limit current to control it(all of the above)
The direction the negative charge moves

44. What is the unit of measurement of resistance?
Relationship between current and potential difference
Ohms
Magnetic properties
5%

45. What is a type of capacitor?
Fixed - Electrolytic - Variable(all of the above)
Stores electrical charge
Ohms
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)

46. What do we call the ability to do work?
First digit is 9
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Produce heat - light - or limit current to control it(all of the above)
Energy

47. What are the two generic methods to eliminate static electricity from metal objects?
Insulation resistance
Bonding and grounding
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)

48. What is the purpose of resistors in electrical circuits?
Alternating current
Produce heat - light - or limit current to control it(all of the above)
Choke
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

49. Why is the transformer important to AC electricity?

50. What results when current is run through a material with high resistance?
Moving vehicles
Unlike poles attract
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Heat and current control(both a and c)