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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 makes electrons flow?
Breakdown voltage
Potential difference
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
5%

2. To what measurement do the conductor mills refer?
1/1000th of an inch
First digit is 9
Voltmeter
First digit

3. Identify the blueprint symbol for capacitors.
Insulation resistance
Symbol
--^V^V^V^---
Opposition to movement of free electrons

4. What types of protective tapes are used?
Plastic - Rubber - Friction(all of the above)
The relationship of potential difference to current
15 -000 ohms - 20%
DC flows continuously in one direction and AC potential difference and current both change direction

5. What does a moving charge produce?
1 watt
The direction the negative charge moves
A magnetic field
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

6. What is insulation resistance?
Secondary cell
5%
Heat and current control(both a and c)
Electrical resistance against the flow of current

7. What is voltage?
Stores electrical charge
Does not move
A difference in potential energy
Common - not rechargable - gradually discharges when in storage(All of the above)

8. What is induction?
Ability to store an electric charge
Area and spacing of capacitor - static current in the capacitor(both A and B)
Cells can be connected together to make a battery
Current change in a coil creates a magnetic change

9. What is the name for electrical resistance of insulation?
10
Magnetic properties
Insulation resistance
Battery

10. What does a transformer transform?
From the negative battery terminal to the positive terminal
First digit
Purging
The relationship of potential difference to current

11. Identify the blueprint symbol for resistors.
Ability to store an electric charge
--^V^V^V^---
Common - not rechargable - gradually discharges when in storage(All of the above)
Voltmeter

12. What is a way to classify wires and cables?
By their covering
Ability to store an electric charge
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Potential difference - E*I - current times current change from point to point(all of the above)

13. When reading resistance color codes - what does the first band indicate?
First digit
Relay
High resistance
Opposition to electrical current

14. 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
Breakdown voltage
Heat and current control(both a and c)
12 volts
The rate of doing work

15. What do junction boxes protect?
Heat
Current flows in one direction - potential differences across a load does not change(Both A and B)
Wire splices
Insulation resistance

16. What results when current is run through a material with high resistance?
Cell
Heat and current control(both a and c)
Resistance value can not be changed
Voltage

17. How is the heat production measured in a resistor?
Potential difference - E*I - current times current change from point to point(all of the above)
Energy
Battery
The rate of doing work

18. What do electrical charges need to cause a fire or explosion?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Alternating current
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

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)
Does not move
Gauge number
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

20. What is a switch that operates by electricity?
Relay
Solenoid and Relay(both A and B)
Volts
Opposition to movement of free electrons

21. What is capacitance in electrical terms?
Ability to store an electric charge
12 volts
Current change in a coil creates a magnetic change
Heat and current control(both a and c)

22. What is the basic law of magnetic force?
Unlike poles attract
Area and spacing of capacitor - static current in the capacitor(both A and B)
The relationship of potential difference to current
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

23. What wire measurement is commonly used in the U.S.?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
DC current
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
American wire gauge(AWG)

24. What type of circuit has one path of follow through a load?
Series circuit
Composition of the resistor
Volts
10%

25. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
5%
10%
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

26. What is the relationship of conductor size and length to resistance?
Resistance increases as the conductor length increases
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
75 Ohms
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

27. What is true about a dry cell?
50 Ohms
Series circuit
Common - not rechargable - gradually discharges when in storage(All of the above)
Opposition to electrical current

28. What is the purpose of a raceway?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Insulation resistance and Dielectric strength(Both A and B)
Porcelain
10

29. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
A difference in potential energy
Voltage
Common - not rechargable - gradually discharges when in storage(All of the above)
The direction of the magnetic field

30. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
Energy
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)
Symbol

31. What is a type of capacitor?
Voltage
15 -000 ohms - 20%
Fixed - Electrolytic - Variable(all of the above)
Composition of the resistor

32. What are the common units of measurement for round and square conductor cross - sections?
The rate of doing work
Alternating current
Current flows in one direction - potential differences across a load does not change(Both A and B)
Circular and square mills(Both A and B)

33. What is needed for electric heating elements and the filaments of light bulbs?
Silver
High resistance
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Voltmeter

34. What is the unit of measurement of electrical current?
Opposes any change in the current flowing in a circuit
1/1000th of an inch
Amperes
Current change in a coil creates a magnetic change

35. What is resistance in electrical terms?
Resistance increases as the conductor length increases
Opposition to movement of free electrons
Symbol
Opposition to electrical current

36. What does a first band of white mean?
Potential difference
Volts
First digit is 9
Cell

37. What is a wire classification?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
12 volts
Bare - covered - insulated - stranded - cable(All of the above)
Moving vehicles

38. What is a DC circuit characteristic?
5%
1 watt
Current flows in one direction - potential differences across a load does not change(Both A and B)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

39. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Opposition to electrical current
Mutual induction
Fixed - Electrolytic - Variable(all of the above)
The direction the negative charge moves

40. What is the purpose of resistors in electrical circuits?
--^V^V^V^---
10%
Insulation resistance
Produce heat - light - or limit current to control it(all of the above)

41. What is an electromagnet?
50 Ohms
Area and spacing of capacitor - static current in the capacitor(both A and B)
5%
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

42. What are the two generic methods to eliminate static electricity from metal objects?
Porcelain
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Bonding and grounding
Insulation resistance

43. Where do the fingers point in both Left-Hand Rules?
DC current
The direction of the magnetic field
Tolerence
Series circuit

44. What is the term for doing work at the rate of joule per second?
Potential difference
Symbol
Grounding wire
1 watt

45. A resistor is color coded brown - green - orange. What is its resistance?
Current flows in one direction - potential differences across a load does not change(Both A and B)
15 -000 ohms - 20%
Solenoid and Relay(both A and B)
Series circuit

46. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
Opposes any change in the current flowing in a circuit
Silver
DC flows continuously in one direction and AC potential difference and current both change direction

47. In most applications - what remains constant if the current remains constant and flows in one direction?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Resistance value can not be changed
Heat and current control(both a and c)
Electromagnetic field

48. How is capacitance determined?
Unlike poles attract
Area and spacing of capacitor - static current in the capacitor(both A and B)
Opposition to movement of free electrons
--^V^V^V^---

49. What is the type of cable composed of many fine wires?
Choke
Stranded
From the negative battery terminal to the positive terminal
The rate of doing work

50. What is a characteristic of a fixed resistor?
Stores electrical charge
Resistance value can not be changed
Chemical action
20%