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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. How many kinds of poles do magnets have?
--^V^V^V^---
Two
Stores electrical charge
Opposes any change in the current flowing in a circuit

2. A resistor is color coded brown - green - orange. What is its resistance?
Cells can be connected together to make a battery
15 -000 ohms - 20%
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)
A magnetic field

3. 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)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Bare - covered - insulated - stranded - cable(All of the above)
Volts

4. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Use an effect to produce another effect
Wire splices
Tolerence
50 Ohms

5. What is resistance?
Opposition to movement of free electrons
Resistance increases as the conductor length increases
A difference in potential energy
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

6. What is the use of the electromagnet?
Battery
Heat
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

7. Which of the following materials is NOT a good conductor?
Porcelain
Resistance increases as the conductor length increases
Cables
Produce heat - light - or limit current to control it(all of the above)

8. The dry cell is what method for creating potential energy?
Heat and current control(both a and c)
Chemical action
Parallel
The relationship of potential difference to current

9. What is an electromagnet?
Serial
DC current
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

10. What cannot be transformed to higher or lower potential differences?
DC current
Does not move
Moving vehicles
Mutual induction

11. What determines whether a spark can be produced?
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)
Strength of the charge
A magnetic field
Purging

12. Where does the thumb point in both Left-Hand Rules?
The direction the negative charge moves
Stores electrical charge
Chemical action
Symbol

13. How do static charges distribute themselves?
Potential difference
Stranded
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

14. What type of circuit has one path of follow through a load?
Series circuit
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Bonding and grounding
Cables

15. How is capacitance determined?
Area and spacing of capacitor - static current in the capacitor(both A and B)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
15 -000 ohms - 20%
From the negative battery terminal to the positive terminal

16. What do junction boxes protect?
Opposition to movement of free electrons
Does not move
Wire splices
Breakdown voltage

17. What does a transformer transform?
Use an effect to produce another effect
The relationship of potential difference to current
15 -000 ohms - 20%
Potential difference

18. What type of circuit has two or more paths for current to follow?
Relay
Start with the band on the end and read to the center
Parallel circuit
1 watt

19. What can permanently break down a capacitor?
Breakdown voltage
Potential difference
Resistance value can not be changed
Fixed - tapped - variable(all of the above)

20. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Electrical resistance against the flow of current
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

21. What is a rigid metal conduit?
How much potential difference can a material withstand before breaking down
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Use an effect to produce another effect

22. What does Ohm's Law represent?
Does not move
Bare - covered - insulated - stranded - cable(All of the above)
The direction of the magnetic field
Relationship between current and potential difference

23. What determines the resistance of a resistor?
How much potential difference can a material withstand before breaking down
Composition of the resistor
Resistance increases as the conductor length increases
DC flows continuously in one direction and AC potential difference and current both change direction

24. What are the names of two of the six primary methods of producing a voltage?
Secondary cell
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
The direction the negative charge moves
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)

25. What does a third band of brown mean?
Alternating current
Volts
10
The direction the negative charge moves

26. What is a wire classification?
50 Ohms
Resistance value can not be changed
Wire splices
Bare - covered - insulated - stranded - cable(All of the above)

27. What is voltage?
Opposition to electrical current
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Electromagnetism
A difference in potential energy

28. Identify the blueprint symbol for capacitors.
Symbol
How much potential difference can a material withstand before breaking down
Two
Cables

29. What is the term for two or more cells attached together?
Moving vehicles
Relationship between current and potential difference
Battery
DC current

30. What is the relationship between cells and batteries?
Composition of the resistor
Resistance increases as the conductor length increases
Cells can be connected together to make a battery
--^V^V^V^---

31. What does a first band of white mean?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Parallel
First digit is 9
Cell

32. Identify the blueprint symbol for resistors.
Cell
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
--^V^V^V^---
1 watt

33. What is the unit of measurement of resistance?
Mutual induction
Moving vehicles
DC flows continuously in one direction and AC potential difference and current both change direction
Ohms

34. What is the type of cable composed of many fine wires?
Stranded
Potential difference - E*I - current times current change from point to point(all of the above)
A magnetic field
First digit

35. Where do the fingers point in both Left-Hand Rules?
A difference in potential energy
The direction of the magnetic field
Breakdown voltage
Secondary cell

36. What is insulation resistance?
Unlike poles attract
Heat and current control(both a and c)
Electrical resistance against the flow of current
Insulation resistance

37. When reading resistance color codes - what does the fourth band indicate?
Two
High resistance
Ability to store an electric charge
Tolerence

38. What is a common cause of static electricity in a shop?
Relay
Current flows in one direction - potential differences across a load does not change(Both A and B)
A difference in potential energy
Moving vehicles

39. What is a common form used in conductors?
Cables
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Parallel circuit
A difference in potential energy

40. What do transducers do in electrical terms?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Use an effect to produce another effect
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
10%

41. What does a moving charge produce?
Porcelain
A magnetic field
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)
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)

42. Which way is the current going in the circuit shown?(electron flow)
High resistance
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)
From the negative battery terminal to the positive terminal
10%

43. How do you read resistor color codes?
Parallel
Start with the band on the end and read to the center
American wire gauge(AWG)
Bonding and grounding

44. What is the fundamental property of insulators?
Opposition to movement of free electrons
Potential difference - E*I - current times current change from point to point(all of the above)
Insulation resistance and Dielectric strength(Both A and B)
Heat and current control(both a and c)

45. What is the name for electrical resistance of insulation?
Use an effect to produce another effect
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)
Insulation resistance
Common - not rechargable - gradually discharges when in storage(All of the above)

46. Why is the transformer important to AC electricity?

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47. To what measurement do the conductor mills refer?
High resistance
1/1000th of an inch
50 Ohms
Electromagnetism

48. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Potential difference
How much potential difference can a material withstand before breaking down
5%
Gauge number

49. 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
Common - not rechargable - gradually discharges when in storage(All of the above)
12 volts
Opposition to electrical current
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)

50. What is the difference between AC and DC?
Relay
First digit is 9
DC flows continuously in one direction and AC potential difference and current both change direction
Potential difference