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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 an arrangement of materials that create a potential difference by chemistry?
Cell
Insulation resistance
15 -000 ohms - 20%
From the negative battery terminal to the positive terminal

2. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Amperes
20%
Area and spacing of capacitor - static current in the capacitor(both A and B)
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)

3. What does a first band of white mean?
Area and spacing of capacitor - static current in the capacitor(both A and B)
First digit is 9
Electrical resistance against the flow of current
Potential difference

4. To what measurement do the conductor mills refer?
1/1000th of an inch
Opposition to electrical current
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

5. What determines whether a spark can be produced?
5%
Mutual induction
Strength of the charge
The relationship of potential difference to current

6. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Moving vehicles
Symbol
Alternating current
Parallel

7. What does an object have if a magnetic field acts on it?
Volts
Magnetic properties
Chemical action
Potential difference

8. The dry cell is what method for creating potential energy?
Secondary cell
Plastic - Rubber - Friction(all of the above)
Chemical action
Area and spacing of capacitor - static current in the capacitor(both A and B)

9. What makes electrons flow?
Potential difference
Unlike poles attract
Magnetic properties
Composition of the resistor

10. What is the fundamental property of insulators?
Heat
Bare - covered - insulated - stranded - cable(All of the above)
20%
Insulation resistance and Dielectric strength(Both A and B)

11. What must be large enough to carry the largest current likely to occur?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Grounding wire
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Serial

12. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
How much potential difference can a material withstand before breaking down
Solenoid and Relay(both A and B)
1 watt
5%

13. What is a characteristic of a fixed resistor?
Produce heat - light - or limit current to control it(all of the above)
First digit is 9
Ohms
Resistance value can not be changed

14. Identify the blueprint symbol for resistors.
Stores electrical charge
Electromagnetism
Current change in a coil creates a magnetic change
--^V^V^V^---

15. What are the names of two of the six primary methods of producing a voltage?
Stranded
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Opposition to electrical current
Produce heat - light - or limit current to control it(all of the above)

16. What is another name for an inductor?
12 volts
Choke
Does not move
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

17. What is a characteristic of insulators?
DC current
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
The direction of the magnetic field
Porcelain

18. What is a common form used in conductors?
Chemical action
Plastic - Rubber - Friction(all of the above)
Cables
Parallel

19. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Voltage
Electromagnetism
10

20. Which of the following materials is NOT a good conductor?
Unlike poles attract
Resistance increases as the conductor length increases
Porcelain
Alternating current

21. What is the unit of measurement of resistance?
Ohms
Volts
Fixed - Electrolytic - Variable(all of the above)
Chemical action

22. Which type of cell can be recharged?
High resistance
Cell
Secondary cell
Mutual induction

23. What is a way to classify wires and cables?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
By their covering
Voltmeter
Start with the band on the end and read to the center

24. In most applications - what remains constant if the current remains constant and flows in one direction?
The relationship of potential difference to current
Electromagnetic field
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Electrical resistance against the flow of current

25. What does resistance produce?
Strength of the charge
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
How much potential difference can a material withstand before breaking down
Heat

26. What instrument measures voltage?
Alternating current
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Circular and square mills(Both A and B)
Voltmeter

27. What determines the resistance of a resistor?
--^V^V^V^---
The relationship of potential difference to current
Heat
Composition of the resistor

28. What is true about a dry cell?
First digit
Common - not rechargable - gradually discharges when in storage(All of the above)
How much potential difference can a material withstand before breaking down
1/1000th of an inch

29. What cannot be transformed to higher or lower potential differences?
75 Ohms
DC current
--^V^V^V^---
Bare - covered - insulated - stranded - cable(All of the above)

30. What does a transformer transform?
Common - not rechargable - gradually discharges when in storage(All of the above)
Use an effect to produce another effect
The relationship of potential difference to current
Potential difference

31. What is a DC circuit characteristic?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Produce heat - light - or limit current to control it(all of the above)
How much potential difference can a material withstand before breaking down
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

32. What is the relationship between magnetism and electricity?
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)
Symbol
Moving vehicles
Solenoid and Relay(both A and B)

33. What can permanently break down a capacitor?
Solenoid and Relay(both A and B)
Breakdown voltage
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)

34. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
Potential difference
Silver
The relationship of potential difference to current

35. How do you read resistor color codes?
Moving vehicles
Grounding wire
The direction the negative charge moves
Start with the band on the end and read to the center

36. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
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)
Heat and current control(both a and c)
Two

37. What is the basic law of magnetic force?
Electromagnetic field
First digit
The direction of the magnetic field
Unlike poles attract

38. How is capacitance determined?
Breakdown voltage
Silver
Area and spacing of capacitor - static current in the capacitor(both A and B)
Stores electrical charge

39. What is dielectric strength?
Plastic - Rubber - Friction(all of the above)
How much potential difference can a material withstand before breaking down
Two
5%

40. What does Ohm's Law represent?
High resistance
Relationship between current and potential difference
Current flows in one direction - potential differences across a load does not change(Both A and B)
Electromagnetic field

41. Where do the fingers point in both Left-Hand Rules?
Gauge number
The direction of the magnetic field
Voltage
10%

42. What are the two generic methods to eliminate static electricity from metal objects?
Bonding and grounding
Area and spacing of capacitor - static current in the capacitor(both A and B)
20%
A difference in potential energy

43. 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
Ability to store an electric charge
Cells can be connected together to make a battery
Amperes
12 volts

44. What is insulation resistance?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
A magnetic field
Electrical resistance against the flow of current
Porcelain

45. What is voltage?
High resistance
12 volts
A difference in potential energy
Current flows in one direction - potential differences across a load does not change(Both A and B)

46. What is the relationship between cells and batteries?
The direction the negative charge moves
Porcelain
Unlike poles attract
Cells can be connected together to make a battery

47. What information do the Left-Hand Rules provide?
The direction the negative charge moves
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Mutual induction
Wire splices

48. What is resistance in electrical terms?
Magnetic properties
Opposition to electrical current
Common - not rechargable - gradually discharges when in storage(All of the above)
Insulation resistance

49. What do junction boxes protect?
Grounding wire
Wire splices
Bonding and grounding
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

50. What types of protective tapes are used?
Plastic - Rubber - Friction(all of the above)
Cells can be connected together to make a battery
Heat and current control(both a and c)
Fixed - Electrolytic - Variable(all of the above)