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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 must be large enough to carry the largest current likely to occur?
Grounding wire
Common - not rechargable - gradually discharges when in storage(All of the above)
Opposition to movement of free electrons
Plastic - Rubber - Friction(all of the above)

2. How many kinds of poles do magnets have?
Serial
Series circuit
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Two

3. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
Voltmeter
Moving vehicles
Ohms

4. What is the type of cable composed of many fine wires?
Ohms
Solenoid and Relay(both A and B)
Stranded
Opposition to movement of free electrons

5. What is the difference between AC and DC?
Grounding wire
DC flows continuously in one direction and AC potential difference and current both change direction
Battery
Solenoid and Relay(both A and B)

6. What do junction boxes protect?
By their covering
Electrical resistance against the flow of current
Wire splices
Energy

7. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Insulation resistance and Dielectric strength(Both A and B)
Opposition to movement of free electrons
Magnetic properties
Parallel

8. What can permanently break down a capacitor?
Cells can be connected together to make a battery
Circular and square mills(Both A and B)
Breakdown voltage
10

9. What is a characteristic of a fixed resistor?
Alternating current
Relationship between current and potential difference
Resistance value can not be changed
Voltage

10. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Amperes
5%
Opposes any change in the current flowing in a circuit
10%

11. What does static electricity do?
Does not move
Symbol
Moving vehicles
Fixed - Electrolytic - Variable(all of the above)

12. What do transducers do in electrical terms?
Use an effect to produce another effect
Gauge number
Current flows in one direction - potential differences across a load does not change(Both A and B)
Cell

13. What is a type of mechanical transducer?
Stranded
Solenoid and Relay(both A and B)
Bare - covered - insulated - stranded - cable(All of the above)
Electromagnetism

14. What are the two generic methods to eliminate static electricity from metal objects?
Chemical action
Fixed - Electrolytic - Variable(all of the above)
Resistance value can not be changed
Bonding and grounding

15. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
75 Ohms
Stores electrical charge
50 Ohms

16. What is resistance?
Stores electrical charge
A difference in potential energy
Opposition to movement of free electrons
Start with the band on the end and read to the center

17. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Voltage
Resistance value can not be changed
Use an effect to produce another effect
From the negative battery terminal to the positive terminal

18. What information do the Left-Hand Rules provide?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Electrical resistance against the flow of current
Start with the band on the end and read to the center

19. What is a way to classify wires and cables?
Insulation resistance
15 -000 ohms - 20%
By their covering
Opposition to electrical current

20. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
Stores electrical charge
DC current
Fixed - Electrolytic - Variable(all of the above)

21. What is a common measure of wire diameter?
Gauge number
Heat and current control(both a and c)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
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)

22. What is an electromagnet?
Potential difference - E*I - current times current change from point to point(all of the above)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Resistance increases as the conductor length increases
The direction of the magnetic field

23. What is the unit of measurement of electrical current?
Amperes
Serial
Energy
Heat

24. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Porcelain
Alternating current
A magnetic field
Parallel

25. What is the relationship between magnetism and electricity?
Composition of the resistor
1/1000th of an inch
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)
Solenoid and Relay(both A and B)

26. How do you read resistor color codes?
Fixed - Electrolytic - Variable(all of the above)
Start with the band on the end and read to the center
Wire splices
Voltmeter

27. What determines the resistance of a resistor?
Volts
Composition of the resistor
10%
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

28. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
20%
High resistance
Plastic - Rubber - Friction(all of the above)

29. What is voltage?
Alternating current
Insulation resistance
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
A difference in potential energy

30. What is an arrangement of materials that create a potential difference by chemistry?
Energy
Cell
Stranded
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

31. What is resistance in electrical terms?
Bonding and grounding
Battery
Relay
Opposition to electrical current

32. What is the unit of measurement of potential difference?
Opposes any change in the current flowing in a circuit
Volts
Relationship between current and potential difference
Resistance value can not be changed

33. The dry cell is what method for creating potential energy?
Chemical action
Electrical resistance against the flow of current
Insulation resistance
Does not move

34. What determines whether a spark can be produced?
Mutual induction
Amperes
Heat and current control(both a and c)
Strength of the charge

35. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Heat
Porcelain
The relationship of potential difference to current

36. 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
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
75 Ohms
Bonding and grounding
Area and spacing of capacitor - static current in the capacitor(both A and B)

37. What types of protective tapes are used?
Symbol
Opposition to movement of free electrons
Plastic - Rubber - Friction(all of the above)
Heat

38. What is a DC circuit characteristic?
Relationship between current and potential difference
From the negative battery terminal to the positive terminal
Current flows in one direction - potential differences across a load does not change(Both A and B)
Stores electrical charge

39. What type of circuit has two or more paths for current to follow?
Common - not rechargable - gradually discharges when in storage(All of the above)
Silver
Parallel circuit
High resistance

40. What does an object have if a magnetic field acts on it?
Fixed - Electrolytic - Variable(all of the above)
Purging
Insulation resistance
Magnetic properties

41. Identify the blueprint symbol for capacitors.
Use an effect to produce another effect
Secondary cell
Potential difference
Symbol

42. What is dielectric strength?
12 volts
Produce heat - light - or limit current to control it(all of the above)
How much potential difference can a material withstand before breaking down
Cables

43. What cannot be transformed to higher or lower potential differences?
DC current
Tolerence
12 volts
Secondary cell

44. When reading resistance color codes - what does the fourth band indicate?
Tolerence
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Cells can be connected together to make a battery
10

45. What is the purpose of a raceway?
The relationship of potential difference to current
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Symbol
Alternating current

46. What is a wire classification?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Fixed - Electrolytic - Variable(all of the above)
The direction the negative charge moves
Bare - covered - insulated - stranded - cable(All of the above)

47. What is the purpose of resistors in electrical circuits?
Amperes
Fixed - Electrolytic - Variable(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Produce heat - light - or limit current to control it(all of the above)

48. Which type of cell can be recharged?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Secondary cell
Heat and current control(both a and c)

49. What is a switch that operates by electricity?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Heat
Relay
Potential difference - E*I - current times current change from point to point(all of the above)

50. In most applications - what remains constant if the current remains constant and flows in one direction?
Electromagnetic field
Solenoid and Relay(both A and B)
Does not move
Cables