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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. 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
Gauge number
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Cables

2. Which of the following materials is NOT a good conductor?
5%
Porcelain
DC current
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

3. Where do the fingers point in both Left-Hand Rules?
Ohms
Silver
The direction of the magnetic field
First digit

4. What do electrical charges need to cause a fire or explosion?
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)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Insulation resistance

5. What is a type of mechanical transducer?
Stores electrical charge
Voltage
Solenoid and Relay(both A and B)
75 Ohms

6. How is capacitance determined?
Magnetic properties
Two
Area and spacing of capacitor - static current in the capacitor(both A and B)
Composition of the resistor

7. What is true about a dry cell?
Moving vehicles
Common - not rechargable - gradually discharges when in storage(All of the above)
Ohms
Mutual induction

8. What is a conductor?
Cables
Voltage
Porcelain
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

9. What is the use of the electromagnet?
Amperes
Area and spacing of capacitor - static current in the capacitor(both A and B)
Alternating current
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

10. Which material has the lowest resistance at ordinary temperatures?
First digit is 9
Silver
Solenoid and Relay(both A and B)
Breakdown voltage

11. Identify the blueprint symbol for capacitors.
Parallel
Potential difference
Symbol
Purging

12. What is the unit of measurement of resistance?
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)
Ohms
Cables

13. What is the unit of measurement of potential difference?
Volts
Electromagnetic field
Gauge number
Composition of the resistor

14. What is the relationship between magnetism and electricity?
Stores electrical charge
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)
Wire splices
Serial

15. What is the type of cable composed of many fine wires?
Resistance increases as the conductor length increases
Stranded
Energy
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

16. What cannot be transformed to higher or lower potential differences?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
DC current
Insulation resistance
DC flows continuously in one direction and AC potential difference and current both change direction

17. What is a common cause of static electricity in a shop?
Moving vehicles
10%
Opposition to electrical current
Resistance value can not be changed

18. What is the relationship of conductor size and length to resistance?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Resistance increases as the conductor length increases
Grounding wire
Cells can be connected together to make a battery

19. What are the names of two of the six primary methods of producing a voltage?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Voltmeter
Parallel circuit
20%

20. To what measurement do the conductor mills refer?
1/1000th of an inch
Fixed - tapped - variable(all of the above)
Opposes any change in the current flowing in a circuit
12 volts

21. What types of protective tapes are used?
Plastic - Rubber - Friction(all of the above)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Electrical resistance against the flow of current
Ohms

22. What is a way to classify wires and cables?
By their covering
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Secondary cell
Energy

23. The generator is what method of creating potential energy?
Porcelain
Parallel circuit
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Electromagnetism

24. What is capacitance in electrical terms?
Opposition to movement of free electrons
Potential difference
Resistance increases as the conductor length increases
Ability to store an electric charge

25. What does an object have if a magnetic field acts on it?
Strength of the charge
DC current
How much potential difference can a material withstand before breaking down
Magnetic properties

26. What is the name for electrical resistance of insulation?
Potential difference
Unlike poles attract
Insulation resistance
Volts

27. 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
First digit is 9
Stranded
75 Ohms
Porcelain

28. What is a type of capacitor?
The rate of doing work
Current change in a coil creates a magnetic change
Fixed - Electrolytic - Variable(all of the above)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

29. What is needed for electric heating elements and the filaments of light bulbs?
Plastic - Rubber - Friction(all of the above)
The direction of the magnetic field
Parallel circuit
High resistance

30. What wire measurement is commonly used in the U.S.?
Silver
Alternating current
A difference in potential energy
American wire gauge(AWG)

31. What is induction?
Current change in a coil creates a magnetic change
Insulation resistance and Dielectric strength(Both A and B)
Electromagnetic field
A magnetic field

32. What does a transformer transform?
The relationship of potential difference to current
First digit is 9
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)
Resistance value can not be changed

33. What type of circuit has one path of follow through a load?
Series circuit
Bonding and grounding
Electromagnetic field
75 Ohms

34. What is the relationship between cells and batteries?
Does not move
Parallel circuit
The direction the negative charge moves
Cells can be connected together to make a battery

35. What must be large enough to carry the largest current likely to occur?
Purging
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Grounding wire
Ability to store an electric charge

36. What is the difference between AC and DC?
Ability to store an electric charge
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
DC flows continuously in one direction and AC potential difference and current both change direction
Opposition to movement of free electrons

37. When does a DC circuit oppose current flow?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
10
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Resistance value can not be changed

38. What determines the resistance of a resistor?
Porcelain
Choke
Composition of the resistor
Resistance increases as the conductor length increases

39. What is a property of inductors in electrical circuits?
Common - not rechargable - gradually discharges when in storage(All of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Resistance value can not be changed
Opposes any change in the current flowing in a circuit

40. What is an arrangement of materials that create a potential difference by chemistry?
Cables
Cell
50 Ohms
Moving vehicles

41. What is a characteristic of a fixed resistor?
--^V^V^V^---
Resistance increases as the conductor length increases
Resistance value can not be changed
Moving vehicles

42. What is a switch that operates by electricity?
12 volts
Tolerence
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Relay

43. Which way is the current going in the circuit shown?(electron flow)
Grounding wire
Breakdown voltage
Wire splices
From the negative battery terminal to the positive terminal

44. What does a first band of white mean?
Tolerence
Resistance value can not be changed
First digit
First digit is 9

45. What determines whether a spark can be produced?
Strength of the charge
Potential difference
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Opposition to electrical current

46. What is the purpose of capacitors in electrical circuits?
Insulation resistance and Dielectric strength(Both A and B)
5%
Potential difference
Stores electrical charge

47. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Voltage
Resistance value can not be changed
Moving vehicles

48. In most applications - what remains constant if the current remains constant and flows in one direction?
First digit
1/1000th of an inch
Electromagnetic field
Use an effect to produce another effect

49. What are the two generic methods to eliminate static electricity from metal objects?
Bonding and grounding
Cell
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Current change in a coil creates a magnetic change

50. What is voltage?
Two
A difference in potential energy
Parallel circuit
Potential difference