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Basic Electricity

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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 the unit of measurement of potential difference?
Potential difference
Purging
20%
Volts

2. What is the purpose of resistors in electrical circuits?
10%
Silver
Produce heat - light - or limit current to control it(all of the above)
The direction the negative charge moves

3. What types of protective tapes are used?
15 -000 ohms - 20%
10%
Plastic - Rubber - Friction(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

4. What is the measure of potential difference?
Energy
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Battery
Volts

5. To what measurement do the conductor mills refer?
Alternating current
Energy
Solenoid and Relay(both A and B)
1/1000th of an inch

6. What is power?
Composition of the resistor
Cables
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
The rate of doing work

7. What does a third band of brown mean?
Series circuit
Purging
Relationship between current and potential difference
10

8. What is the fundamental property of insulators?
Insulation resistance and Dielectric strength(Both A and B)
Cables
DC current
75 Ohms

9. What is the unit of measurement of resistance?
Ohms
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Bonding and grounding
A difference in potential energy

10. What is resistance?
Voltmeter
Stores electrical charge
50 Ohms
Opposition to movement of free electrons

11. What is a DC circuit characteristic?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Stranded
Alternating current

12. What is the term for doing work at the rate of joule per second?
1 watt
Opposes any change in the current flowing in a circuit
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
The direction the negative charge moves

13. What is the type of cable composed of many fine wires?
The direction of the magnetic field
Tolerence
Stranded
5%

14. What is the use of the electromagnet?
Cell
DC flows continuously in one direction and AC potential difference and current both change direction
Resistance value can not be changed
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

15. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Opposes any change in the current flowing in a circuit
Serial
Insulation resistance
5%

16. Which material has the lowest resistance at ordinary temperatures?
The rate of doing work
Silver
Start with the band on the end and read to the center
1/1000th of an inch

17. What is a switch that operates by electricity?
Relay
Choke
Does not move
Cables

18. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Insulation resistance and Dielectric strength(Both A and B)
Heat
Voltmeter
20%

19. What does resistance produce?
Purging
Tolerence
Heat
Grounding wire

20. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
Ability to store an electric charge
How much potential difference can a material withstand before breaking down
Fixed - Electrolytic - Variable(all of the above)

21. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
20%
American wire gauge(AWG)
Purging
Volts

22. What is the relationship of conductor size and length to resistance?
Choke
Electromagnetic field
Resistance increases as the conductor length increases
50 Ohms

23. What is a characteristic of insulators?
Voltage
Tolerence
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Heat

24. What are the names of two of the six primary methods of producing a voltage?
20%
Symbol
Ability to store an electric charge
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

25. What is the relationship between cells and batteries?
Cells can be connected together to make a battery
12 volts
Ohms
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

26. What is the difference between AC and DC?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
DC flows continuously in one direction and AC potential difference and current both change direction
Common - not rechargable - gradually discharges when in storage(All of the above)
Grounding wire

27. What is an electromagnet?
The direction of the magnetic field
Choke
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Use an effect to produce another effect

28. What makes electrons flow?
Voltage
Symbol
Potential difference
5%

29. What makes electrons flow?
Chemical action
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)
Two
Potential difference

30. What does Ohm's Law represent?
A difference in potential energy
Porcelain
Relationship between current and potential difference
DC current

31. What is resistance in electrical terms?
The direction of the magnetic field
Purging
Ohms
Opposition to electrical current

32. What is a common measure of wire diameter?
Volts
The relationship of potential difference to current
Magnetic properties
Gauge number

33. Identify the blueprint symbol for resistors.
Current flows in one direction - potential differences across a load does not change(Both A and B)
--^V^V^V^---
Parallel
Two

34. Identify the blueprint symbol for capacitors.
Opposition to movement of free electrons
Amperes
Symbol
Fixed - tapped - variable(all of the above)

35. What is a common cause of static electricity in a shop?
The rate of doing work
Strength of the charge
Moving vehicles
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

36. When reading resistance color codes - what does the fourth band indicate?
Chemical action
Resistance increases as the conductor length increases
Potential difference
Tolerence

37. What is a characteristic of a fixed resistor?
Resistance increases as the conductor length increases
Potential difference
15 -000 ohms - 20%
Resistance value can not be changed

38. What instrument measures voltage?
Voltmeter
Secondary cell
Electromagnetic field
Amperes

39. What is the purpose of capacitors in electrical circuits?
Choke
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Chemical action
Stores electrical charge

40. How is the heat production measured in a resistor?
Tolerence
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)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Potential difference - E*I - current times current change from point to point(all of the above)

41. What can permanently break down a capacitor?
10
Breakdown voltage
Symbol
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

42. What does an object have if a magnetic field acts on it?
Magnetic properties
American wire gauge(AWG)
Resistance increases as the conductor length increases
Opposition to electrical current

43. What cannot be transformed to higher or lower potential differences?
Cables
DC current
Area and spacing of capacitor - static current in the capacitor(both A and B)
15 -000 ohms - 20%

44. What must be large enough to carry the largest current likely to occur?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Grounding wire
Parallel circuit
75 Ohms

45. How is capacitance determined?
Common - not rechargable - gradually discharges when in storage(All of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Resistance value can not be changed
20%

46. What is induction?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Current change in a coil creates a magnetic change
Two
Ability to store an electric charge

47. What are the two generic methods to eliminate static electricity from metal objects?
Area and spacing of capacitor - static current in the capacitor(both A and B)
10%
Two
Bonding and grounding

48. What is the unit of measurement of electrical current?
A difference in potential energy
Amperes
Energy
Stranded

49. How do you read resistor color codes?
--^V^V^V^---
Electrical resistance against the flow of current
Volts
Start with the band on the end and read to the center

50. 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
Potential difference - E*I - current times current change from point to point(all of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Relationship between current and potential difference
75 Ohms

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Basic Electricity

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