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Basic Electricity

Instructions:

Answer 50 questions in 15 minutes.
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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. When reading resistance color codes - what does the fourth band indicate?
Tolerence
5%
Stores electrical charge
Opposes any change in the current flowing in a circuit

2. Where do the fingers point in both Left-Hand Rules?
Secondary cell
The direction of the magnetic field
Choke
Area and spacing of capacitor - static current in the capacitor(both A and B)

3. What is the purpose of resistors in electrical circuits?
A difference in potential energy
Voltmeter
Produce heat - light - or limit current to control it(all of the above)
Current change in a coil creates a magnetic change

4. What do we call the ability to do work?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Energy
Amperes
Two

5. What is needed for electric heating elements and the filaments of light bulbs?
12 volts
High resistance
A difference in potential energy
10%

6. What results when current is run through a material with high resistance?
Start with the band on the end and read to the center
By their covering
The relationship of potential difference to current
Heat and current control(both a and c)

7. What does a moving charge produce?
A difference in potential energy
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
A magnetic field
How much potential difference can a material withstand before breaking down

8. Which way is the current going in the circuit shown?(electron flow)
From the negative battery terminal to the positive terminal
75 Ohms
10%
Produce heat - light - or limit current to control it(all of the above)

9. What is the type of cable composed of many fine wires?
Cells can be connected together to make a battery
Stores electrical charge
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Stranded

10. What is a common measure of wire diameter?
Bonding and grounding
Gauge number
Series circuit
20%

11. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
1/1000th of an inch
Heat
Use an effect to produce another effect

12. What must be large enough to carry the largest current likely to occur?
Grounding wire
15 -000 ohms - 20%
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Energy

13. How is the heat production measured in a resistor?
Stores electrical charge
Series circuit
Potential difference - E*I - current times current change from point to point(all of the above)
Unlike poles attract

14. What is the term for two or more cells attached together?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Battery
Cables
Gauge number

15. What instrument measures voltage?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Voltmeter
Alternating current

16. The thermocouple uses which method for creating potential energy?
Composition of the resistor
75 Ohms
Gauge number
Heat

17. What are the common units of measurement for round and square conductor cross - sections?
Potential difference
Circular and square mills(Both A and B)
Stores electrical charge
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

18. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Two
First digit is 9
Voltage
Voltmeter

19. What is a characteristic of a fixed resistor?
Insulation resistance and Dielectric strength(Both A and B)
Resistance value can not be changed
Energy
1/1000th of an inch

20. What does Ohm's Law represent?
Volts
Relationship between current and potential difference
Circular and square mills(Both A and B)
50 Ohms

21. What is a characteristic of insulators?
Relationship between current and potential difference
Opposition to movement of free electrons
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
First digit is 9

22. What is power?
The rate of doing work
Current flows in one direction - potential differences across a load does not change(Both A and B)
Insulation resistance and Dielectric strength(Both A and B)
A difference in potential energy

23. What do transducers do in electrical terms?
Electromagnetic field
Resistance value can not be changed
Use an effect to produce another effect
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

24. What is the relationship of conductor size and length to resistance?
1 watt
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Resistance increases as the conductor length increases
Cell

25. What is an arrangement of materials that create a potential difference by chemistry?
Porcelain
Moving vehicles
Cell
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

26. The generator is what method of creating potential energy?
Volts
First digit is 9
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Electromagnetism

27. What are the two generic methods to eliminate static electricity from metal objects?
Mutual induction
Opposes any change in the current flowing in a circuit
Bonding and grounding
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

28. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
5%
Moving vehicles
Stores electrical charge
1 watt

29. What does static electricity do?
Electromagnetism
The rate of doing work
Potential difference - E*I - current times current change from point to point(all of the above)
Does not move

30. How many kinds of poles do magnets have?
Two
Cells can be connected together to make a battery
Strength of the charge
50 Ohms

31. What is a switch that operates by electricity?
The direction of the magnetic field
Relay
Area and spacing of capacitor - static current in the capacitor(both A and B)
50 Ohms

32. What makes electrons flow?
Alternating current
Potential difference
Purging
Cells can be connected together to make a battery

33. What is the name for electrical resistance of insulation?
Insulation resistance
Choke
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Parallel

34. What is resistance?
Fixed - Electrolytic - Variable(all of the above)
Use an effect to produce another effect
Opposition to movement of free electrons
1 watt

35. Identify the general blueprint symbol for inductors.
Symbol
Area and spacing of capacitor - static current in the capacitor(both A and B)
Grounding wire
Amperes

36. What information do the Left-Hand Rules provide?
Voltage
The relationship of potential difference to current
Moving vehicles
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

37. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Parallel circuit
5%
50 Ohms
Volts

38. When does a DC circuit oppose current flow?
Alternating current
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Fixed - Electrolytic - Variable(all of the above)
Cables

39. What does a third band of brown mean?
Unlike poles attract
10
Bonding and grounding
Common - not rechargable - gradually discharges when in storage(All of the above)

40. 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
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Plastic - Rubber - Friction(all of the above)
American wire gauge(AWG)
75 Ohms

41. What is voltage?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
A difference in potential energy
From the negative battery terminal to the positive terminal
Tolerence

42. What determines the resistance of a resistor?
Composition of the resistor
Use an effect to produce another effect
Stranded
10

43. What do junction boxes protect?
Cables
Wire splices
Amperes
Potential difference - E*I - current times current change from point to point(all of the above)

44. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Resistance increases as the conductor length increases
Mutual induction
Does not move
Heat

45. What is the unit of measurement of electrical current?
Electrical resistance against the flow of current
Amperes
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
From the negative battery terminal to the positive terminal

46. What is a common cause of static electricity in a shop?
The rate of doing work
Moving vehicles
Circular and square mills(Both A and B)
12 volts

47. What is the fundamental property of insulators?
Insulation resistance and Dielectric strength(Both A and B)
Grounding wire
Voltmeter
50 Ohms

48. What is another name for an inductor?
Energy
10
Gauge number
Choke

49. What wire measurement is commonly used in the U.S.?
Choke
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
American wire gauge(AWG)
Battery

50. What types of protective tapes are used?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
1 watt
Plastic - Rubber - Friction(all of the above)
The relationship of potential difference to current

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Basic Electricity

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