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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 type of cable composed of many fine wires?
Tolerence
Unlike poles attract
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Stranded

2. The thermocouple uses which method for creating potential energy?
Heat
Series circuit
Two
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

3. What is the difference between AC and DC?
10%
By their covering
DC flows continuously in one direction and AC potential difference and current both change direction
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

4. What is the unit of measurement of potential difference?
Volts
Voltmeter
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
First digit is 9

5. What is the purpose of a raceway?
Serial
Electromagnetism
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

6. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
Ohms
Gauge number
Current change in a coil creates a magnetic change

7. What do transducers do in electrical terms?
Energy
Electrical resistance against the flow of current
Use an effect to produce another effect
Common - not rechargable - gradually discharges when in storage(All of the above)

8. What is the term for two or more cells attached together?
Battery
Porcelain
Produce heat - light - or limit current to control it(all of the above)
Resistance increases as the conductor length increases

9. Which of the following materials is NOT a good conductor?
Strength of the charge
Series circuit
A magnetic field
Porcelain

10. Where does the thumb point in both Left-Hand Rules?
DC flows continuously in one direction and AC potential difference and current both change direction
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Cell
The direction the negative charge moves

11. Why is the transformer important to AC electricity?

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12. What is the relationship of conductor size and length to resistance?
Series circuit
Cables
Resistance increases as the conductor length increases
1 watt

13. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Unlike poles attract
Mutual induction
10%
75 Ohms

14. Which material has the lowest resistance at ordinary temperatures?
Silver
Insulation resistance and Dielectric strength(Both A and B)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
15 -000 ohms - 20%

15. What is a switch that operates by electricity?
15 -000 ohms - 20%
Silver
Relay
Mutual induction

16. What is the basic law of magnetic force?
Resistance increases as the conductor length increases
Chemical action
Unlike poles attract
Electrical resistance against the flow of current

17. 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
12 volts
50 Ohms
1 watt
Parallel circuit

18. What determines whether a spark can be produced?
American wire gauge(AWG)
Strength of the charge
First digit
DC current

19. What is the purpose of resistors in electrical circuits?
Ohms
Produce heat - light - or limit current to control it(all of the above)
Resistance value can not be changed
Ability to store an electric charge

20. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Voltmeter
Voltage
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)
50 Ohms

21. 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
Energy
Composition of the resistor

22. What instrument measures voltage?
Potential difference - E*I - current times current change from point to point(all of the above)
5%
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Voltmeter

23. What is a type of capacitor?
20%
The direction the negative charge moves
Fixed - Electrolytic - Variable(all of the above)
--^V^V^V^---

24. What does a first band of white mean?
Stranded
First digit is 9
20%
Energy

25. What are the two generic methods to eliminate static electricity from metal objects?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Bonding and grounding
Composition of the resistor
Fixed - tapped - variable(all of the above)

26. What is power?
Choke
How much potential difference can a material withstand before breaking down
The rate of doing work
Secondary cell

27. What is induction?
Current change in a coil creates a magnetic change
DC flows continuously in one direction and AC potential difference and current both change direction
The direction of the magnetic field
Bonding and grounding

28. What is dielectric strength?
Resistance value can not be changed
Alternating current
50 Ohms
How much potential difference can a material withstand before breaking down

29. 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
20%
75 Ohms
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Cell

30. What is a conductor?
Resistance increases as the conductor length increases
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Heat and current control(both a and c)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

31. What type of circuit has one path of follow through a load?
Series circuit
Tolerence
Parallel circuit
Insulation resistance and Dielectric strength(Both A and B)

32. What determines the resistance of a resistor?
Composition of the resistor
Secondary cell
The direction the negative charge moves
Fixed - Electrolytic - Variable(all of the above)

33. What is needed for electric heating elements and the filaments of light bulbs?
Heat
Breakdown voltage
12 volts
High resistance

34. What is the unit of measurement of resistance?
Moving vehicles
Relationship between current and potential difference
Ohms
Stranded

35. What is the unit of measurement of electrical current?
DC flows continuously in one direction and AC potential difference and current both change direction
75 Ohms
The relationship of potential difference to current
Amperes

36. The generator is what method of creating potential energy?
1/1000th of an inch
Resistance increases as the conductor length increases
Electromagnetism
Volts

37. What is a way to classify wires and cables?
Series circuit
Voltage
By their covering
Opposes any change in the current flowing in a circuit

38. Which type of cell can be recharged?
Cell
Secondary cell
Heat
First digit is 9

39. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Insulation 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)
10%
Use an effect to produce another effect

40. What do we call the ability to do work?
Resistance increases as the conductor length increases
--^V^V^V^---
Energy
Voltage

41. What do junction boxes protect?
50 Ohms
Wire splices
From the negative battery terminal to the positive terminal
Cell

42. Which way is the current going in the circuit shown?(electron flow)
Opposition to electrical current
From the negative battery terminal to the positive terminal
Common - not rechargable - gradually discharges when in storage(All of the above)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

43. What does an object have if a magnetic field acts on it?
Magnetic properties
DC flows continuously in one direction and AC potential difference and current both change direction
By their covering
Ability to store an electric charge

44. What is insulation resistance?
By their covering
A difference in potential energy
Electrical resistance against the flow of current
Insulation resistance and Dielectric strength(Both A and B)

45. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
American wire gauge(AWG)
5%
Mutual induction

46. What do electrical charges need to cause a fire or explosion?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Moving vehicles
Bonding and grounding
First digit is 9

47. A resistor is color coded brown - green - orange. What is its resistance?
Use an effect to produce another effect
15 -000 ohms - 20%
Opposition to movement of free electrons
A magnetic field

48. What does a transformer transform?
The relationship of potential difference to current
10%
Resistance increases as the conductor length increases
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

49. What makes electrons flow?
Potential difference
Heat and current control(both a and c)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Mutual induction

50. How do you read resistor color codes?
Solenoid and Relay(both A and B)
The direction of the magnetic field
Start with the band on the end and read to the center
Gauge number

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Basic Electricity

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