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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 the purpose of resistors in electrical circuits?
Stranded
Produce heat - light - or limit current to control it(all of the above)
Chemical action
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

2. 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
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
1/1000th of an inch
75 Ohms
Electrical resistance against the flow of current

3. Which of the following materials is NOT a good conductor?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
1/1000th of an inch
Porcelain
Stores electrical charge

4. What is true about a dry cell?
Common - not rechargable - gradually discharges when in storage(All of the above)
The rate of doing work
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Breakdown voltage

5. What does a moving charge produce?
A magnetic field
DC flows continuously in one direction and AC potential difference and current both change direction
Use an effect to produce another effect
Electromagnetism

6. What does resistance produce?
5%
Mutual induction
Heat
Electromagnetic field

7. What can permanently break down a capacitor?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Breakdown voltage
Stores electrical charge
Use an effect to produce another effect

8. What are the common units of measurement for round and square conductor cross - sections?
Use an effect to produce another effect
Circular and square mills(Both A and B)
Insulation resistance
Serial

9. What is a wire classification?
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)
Heat
Produce heat - light - or limit current to control it(all of the above)
Bare - covered - insulated - stranded - cable(All of the above)

10. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Purging
50 Ohms
Fixed - Electrolytic - Variable(all of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)

11. What do transducers do in electrical terms?
Use an effect to produce another effect
Potential difference - E*I - current times current change from point to point(all of the above)
Volts
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

12. What does a third band of brown mean?
Energy
Unlike poles attract
10
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

13. What is an arrangement of materials that create a potential difference by chemistry?
75 Ohms
Cell
Electromagnetism
Circular and square mills(Both A and B)

14. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Insulation resistance
Voltage
Produce heat - light - or limit current to control it(all of the above)
75 Ohms

15. What results when current is run through a material with high resistance?
Chemical action
Opposition to electrical current
Heat and current control(both a and c)
20%

16. What is resistance in electrical terms?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Ohms
Opposition to electrical current
The direction the negative charge moves

17. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
Symbol
Parallel circuit
Heat

18. What is a rigid metal conduit?
Potential difference - E*I - current times current change from point to point(all of the above)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
The direction of the magnetic field
First digit

19. Why is the transformer important to AC electricity?

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20. What does Ohm's Law represent?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Relationship between current and potential difference
From the negative battery terminal to the positive terminal
Bare - covered - insulated - stranded - cable(All of the above)

21. What instrument measures voltage?
Voltmeter
Unlike poles attract
The rate of doing work
1 watt

22. What does an object have if a magnetic field acts on it?
Energy
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Magnetic properties
DC flows continuously in one direction and AC potential difference and current both change direction

23. Where does the thumb point in both Left-Hand Rules?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Ability to store an electric charge
The direction the negative charge moves
Resistance increases as the conductor length increases

24. Where do the fingers point in both Left-Hand Rules?
Moving vehicles
Gauge number
The direction of the magnetic field
Electromagnetism

25. What wire measurement is commonly used in the U.S.?
From the negative battery terminal to the positive terminal
The direction of the magnetic field
American wire gauge(AWG)
Parallel

26. What cannot be transformed to higher or lower potential differences?
Cell
Heat
Breakdown voltage
DC current

27. What is a common cause of static electricity in a shop?
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)
Ohms
Moving vehicles
Opposition to electrical current

28. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Serial
The rate of doing work
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)
The direction of the magnetic field

29. What is the unit of measurement of resistance?
12 volts
Ohms
Series circuit
Fixed - tapped - variable(all of the above)

30. In most applications - what remains constant if the current remains constant and flows in one direction?
Fixed - Electrolytic - Variable(all of the above)
Electromagnetic field
Ability to store an electric charge
Stores electrical charge

31. When reading resistance color codes - what does the first band indicate?
Grounding wire
First digit
DC current
Bare - covered - insulated - stranded - cable(All of the above)

32. What is voltage?
Area and spacing of capacitor - static current in the capacitor(both A and B)
A difference in potential energy
Voltage
Use an effect to produce another effect

33. What does a transformer transform?
Amperes
Grounding wire
The relationship of potential difference to current
Ability to store an electric charge

34. What is the relationship between magnetism and electricity?
Serial
Produce heat - light - or limit current to control it(all of the above)
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)
First digit is 9

35. What determines the resistance of a resistor?
10%
Composition of the resistor
Strength of the charge
Moving vehicles

36. What is the unit of measurement of electrical current?
Amperes
Produce heat - light - or limit current to control it(all of the above)
Cells can be connected together to make a battery
Relay

37. What makes electrons flow?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Fixed - tapped - variable(all of the above)
Use an effect to produce another effect
Potential difference

38. What are the two generic methods to eliminate static electricity from metal objects?
The direction of the magnetic field
Bonding and grounding
Moving vehicles
Fixed - tapped - variable(all of the above)

39. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Porcelain
20%
Cells can be connected together to make a battery
Stranded

40. What is an electromagnet?
Start with the band on the end and read to the center
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Parallel circuit
1 watt

41. What do electrical charges need to cause a fire or explosion?
Heat
The direction of the magnetic field
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Symbol

42. What is dielectric strength?
Grounding wire
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
How much potential difference can a material withstand before breaking down
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

43. What is the unit of measurement of potential difference?
Current change in a coil creates a magnetic change
Volts
Wire splices
Alternating current

44. When reading resistance color codes - what does the fourth band indicate?
Heat and current control(both a and c)
Tolerence
Composition of the resistor
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

45. What is the relationship between cells and batteries?
Cells can be connected together to make a battery
From the negative battery terminal to the positive terminal
Tolerence
Volts

46. What is needed for electric heating elements and the filaments of light bulbs?
Tolerence
Current change in a coil creates a magnetic change
High resistance
Bonding and grounding

47. What is a characteristic of insulators?
Resistance increases as the conductor length increases
Unlike poles attract
Use an effect to produce another effect
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

48. How is the heat production measured in a resistor?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Potential difference - E*I - current times current change from point to point(all of the above)
Gauge number
Cells can be connected together to make a battery

49. How is capacitance determined?
5%
1 watt
Area and spacing of capacitor - static current in the capacitor(both A and B)
The direction of the magnetic field

50. A resistor is color coded brown - green - orange. What is its resistance?
Ohms
15 -000 ohms - 20%
The direction of the magnetic field
The relationship of potential difference to current