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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 capacitors in electrical circuits?
Stores electrical charge
Purging
Volts
How much potential difference can a material withstand before breaking down

2. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Battery
The direction the negative charge moves
Voltage

3. What do we call the ability to do work?
50 Ohms
Fixed - tapped - variable(all of the above)
Energy
10

4. What is the difference between AC and DC?
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)
DC flows continuously in one direction and AC potential difference and current both change direction
First digit is 9
Voltmeter

5. Identify the general blueprint symbol for inductors.
Plastic - Rubber - Friction(all of the above)
Symbol
The direction the negative charge moves
Cables

6. What does resistance produce?
Battery
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
By their covering
Heat

7. In most applications - what remains constant if the current remains constant and flows in one direction?
10
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Electromagnetic field
Breakdown voltage

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

9. Why is the transformer important to AC electricity?

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10. What does a transformer transform?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Battery
Tolerence
The relationship of potential difference to current

11. What is a common cause of static electricity in a shop?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Moving vehicles
Symbol
From the negative battery terminal to the positive terminal

12. What is insulation resistance?
Porcelain
Relay
Electrical resistance against the flow of current
Voltmeter

13. What are the common units of measurement for round and square conductor cross - sections?
Circular and square mills(Both A and B)
A difference in potential energy
Unlike poles attract
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

14. What is power?
10%
Relay
Battery
The rate of doing work

15. What is a type of capacitor?
High resistance
Fixed - Electrolytic - Variable(all of the above)
Heat
Use an effect to produce another effect

16. What is a wire classification?
The direction of the magnetic field
Bare - covered - insulated - stranded - cable(All of the above)
Two
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)

17. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Mutual induction
A difference in potential energy
Produce heat - light - or limit current to control it(all of the above)
Ohms

18. What do transducers do in electrical terms?
Insulation resistance and Dielectric strength(Both A and B)
Opposition to electrical current
Use an effect to produce another effect
First digit

19. What is a way to classify wires and cables?
12 volts
Symbol
Ohms
By their covering

20. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Mutual induction
10%
Ability to store an electric charge

21. What is an electromagnet?
Electrical resistance against the flow of current
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
Does not move

22. What is the use of the electromagnet?
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)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Stores electrical charge

23. What is needed for electric heating elements and the filaments of light bulbs?
10
50 Ohms
High resistance
Magnetic properties

24. 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)
Potential difference
First digit is 9
Resistance value can not be changed

25. What is a characteristic of a fixed resistor?
Cell
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Stores electrical charge
Resistance value can not be changed

26. To what measurement do the conductor mills refer?
1/1000th of an inch
--^V^V^V^---
Start with the band on the end and read to the center
Symbol

27. What does Ohm's Law represent?
Unlike poles attract
Purging
Relationship between current and potential difference
--^V^V^V^---

28. What is induction?
Resistance value can not be changed
Insulation resistance and Dielectric strength(Both A and B)
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)
Current change in a coil creates a magnetic change

29. Which type of cell can be recharged?
Secondary cell
Battery
Volts
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

30. What is an arrangement of materials that create a potential difference by chemistry?
Symbol
Cell
Tolerence
Alternating current

31. What is capacitance in electrical terms?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Unlike poles attract
Ability to store an electric charge
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

32. What is a type of mechanical transducer?
Solenoid and Relay(both A and B)
Potential difference
50 Ohms
DC current

33. What is the type of cable composed of many fine wires?
Resistance increases as the conductor length increases
Stranded
Breakdown voltage
Start with the band on the end and read to the center

34. What is voltage?
Heat
A difference in potential energy
Ability to store an electric charge
Mutual induction

35. What wire measurement is commonly used in the U.S.?
Strength of the charge
American wire gauge(AWG)
Stranded
Moving vehicles

36. Identify the blueprint symbol for capacitors.
Symbol
Resistance value can not be changed
Stranded
Opposes any change in the current flowing in a circuit

37. What is a DC circuit characteristic?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Amperes
Breakdown voltage
Current flows in one direction - potential differences across a load does not change(Both A and B)

38. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
Composition of the resistor
12 volts
Wire splices

39. What does a moving charge produce?
A magnetic field
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Cell
Area and spacing of capacitor - static current in the capacitor(both A and B)

40. Where do the fingers point in both Left-Hand Rules?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
The direction of the magnetic field
--^V^V^V^---
A magnetic field

41. What is resistance?
A magnetic field
Opposition to movement of free electrons
First digit is 9
Symbol

42. What is the measure of potential difference?
Parallel
Volts
Area and spacing of capacitor - static current in the capacitor(both A and B)
Plastic - Rubber - Friction(all of the above)

43. When reading resistance color codes - what does the first band indicate?
Wire splices
20%
First digit
Does not move

44. Which way is the current going in the circuit shown?(electron flow)
10%
1/1000th of an inch
10
From the negative battery terminal to the positive terminal

45. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Current change in a coil creates a magnetic change
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Electromagnetic field
5%

46. What do junction boxes protect?
Grounding wire
Wire splices
Heat
Opposition to movement of free electrons

47. What does an object have if a magnetic field acts on it?
Fixed - Electrolytic - Variable(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Magnetic properties
A magnetic field

48. What is the fundamental property of insulators?
10%
Insulation resistance and Dielectric strength(Both A and B)
Moving vehicles
5%

49. What is the relationship between magnetism and electricity?
Symbol
Chemical action
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)
DC flows continuously in one direction and AC potential difference and current both change direction

50. What is the relationship between cells and batteries?
Fixed - tapped - variable(all of the above)
First digit
Cells can be connected together to make a battery
Secondary cell