Test your basic knowledge |

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 a common form used in conductors?
Cables
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Plastic - Rubber - Friction(all of the above)
From the negative battery terminal to the positive terminal

2. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Alternating current
50 Ohms
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Circular and square mills(Both A and B)

3. Identify the blueprint symbol for capacitors.
Ohms
Current flows in one direction - potential differences across a load does not change(Both A and B)
Symbol
Area and spacing of capacitor - static current in the capacitor(both A and B)

4. What do junction boxes protect?
Cells can be connected together to make a battery
Wire splices
Opposes any change in the current flowing in a circuit
First digit is 9

5. What is insulation resistance?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
By their covering
Electrical resistance against the flow of current
Heat

6. How many kinds of poles do magnets have?
Resistance increases as the conductor length increases
5%
From the negative battery terminal to the positive terminal
Two

7. What is a common cause of static electricity in a shop?
Moving vehicles
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Choke
Parallel

8. Which way is the current going in the circuit shown?(electron flow)
Silver
Insulation resistance
From the negative battery terminal to the positive terminal
Current change in a coil creates a magnetic change

9. What does a transformer transform?
The relationship of potential difference to current
Plastic - Rubber - Friction(all of the above)
Parallel
American wire gauge(AWG)

10. What is the basic law of magnetic force?
1 watt
Alternating current
Tolerence
Unlike poles attract

11. What types of protective tapes are used?
Unlike poles attract
The direction the negative charge moves
Relay
Plastic - Rubber - Friction(all of the above)

12. Identify the blueprint symbol for resistors.
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Plastic - Rubber - Friction(all of the above)
50 Ohms
--^V^V^V^---

13. What information do the Left-Hand Rules provide?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Composition of the resistor

14. Which material has the lowest resistance at ordinary temperatures?
Silver
Symbol
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
1/1000th of an inch

15. What is voltage?
Serial
Silver
A difference in potential energy
Moving vehicles

16. What is the unit of measurement of potential difference?
Fixed - tapped - variable(all of the above)
Purging
Potential difference - E*I - current times current change from point to point(all of the above)
Volts

17. What is the measure of potential difference?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Volts
Porcelain
Wire splices

18. Which of the following is a type of resistor?
Secondary cell
Serial
50 Ohms
Fixed - tapped - variable(all of the above)

19. What are the two generic methods to eliminate static electricity from metal objects?
Two
Bonding and grounding
Heat
75 Ohms

20. What is a rigid metal conduit?
Fixed - Electrolytic - Variable(all of the above)
Energy
Secondary cell
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

21. What is another name for an inductor?
Choke
Use an effect to produce another effect
12 volts
DC current

22. What is resistance in electrical terms?
Secondary cell
5%
Grounding wire
Opposition to electrical current

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

24. What is capacitance in electrical terms?
Silver
Fixed - Electrolytic - Variable(all of the above)
First digit
Ability to store an electric charge

25. What must be large enough to carry the largest current likely to occur?
How much potential difference can a material withstand before breaking down
Common - not rechargable - gradually discharges when in storage(All of the above)
Cables
Grounding wire

26. In most applications - what remains constant if the current remains constant and flows in one direction?
Gauge number
Parallel circuit
Electromagnetic field
Magnetic properties

27. A resistor is color coded brown - green - orange. What is its resistance?
15 -000 ohms - 20%
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Potential difference - E*I - current times current change from point to point(all of the above)
Use an effect to produce another effect

28. What is the unit of measurement of resistance?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Ohms
Symbol
The direction the negative charge moves

29. What type of circuit has two or more paths for current to follow?
Fixed - tapped - variable(all of the above)
Electrical resistance against the flow of current
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)
Parallel circuit

30. What is dielectric strength?
Parallel circuit
Fixed - tapped - variable(all of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
How much potential difference can a material withstand before breaking down

31. When does a DC circuit oppose current flow?
Voltmeter
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Porcelain
Voltage

32. The generator is what method of creating potential energy?
Voltage
Unlike poles attract
Electromagnetism
Current flows in one direction - potential differences across a load does not change(Both A and B)

33. 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
Parallel circuit
The direction of the magnetic field
Does not move

34. What instrument measures voltage?
The direction of the magnetic field
Voltmeter
Choke
Current flows in one direction - potential differences across a load does not change(Both A and B)

35. What is a characteristic of insulators?
First digit
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
A magnetic field
Composition of the resistor

36. What does resistance produce?
Heat
Voltmeter
Cells can be connected together to make a battery
10%

37. The thermocouple uses which method for creating potential energy?
Serial
Two
Current flows in one direction - potential differences across a load does not change(Both A and B)
Heat

38. What is the purpose of capacitors in electrical circuits?
Insulation resistance and Dielectric strength(Both A and B)
Relationship between current and potential difference
Fixed - tapped - variable(all of the above)
Stores electrical charge

39. What is the use of the electromagnet?
Breakdown voltage
Current flows in one direction - potential differences across a load does not change(Both A and B)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Does not move

40. What is resistance?
Volts
Opposition to movement of free electrons
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Unlike poles attract

41. What is the type of cable composed of many fine wires?
Stranded
Tolerence
Relay
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

42. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Fixed - Electrolytic - Variable(all of the above)
20%
Resistance increases as the conductor length increases
Opposition to electrical current

43. What is a common measure of wire diameter?
The rate of doing work
Current change in a coil creates a magnetic change
Purging
Gauge number

44. What is true about a dry cell?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Common - not rechargable - gradually discharges when in storage(All of the above)
5%
Mutual induction

45. What determines whether a spark can be produced?
A difference in potential energy
DC flows continuously in one direction and AC potential difference and current both change direction
Amperes
Strength of the charge

46. What is a type of mechanical transducer?
Potential difference - E*I - current times current change from point to point(all of the above)
Fixed - Electrolytic - Variable(all of the above)
Solenoid and Relay(both A and B)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

47. What is a DC circuit characteristic?
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)
Energy
Current flows in one direction - potential differences across a load does not change(Both A and B)
Two

48. What does an object have if a magnetic field acts on it?
Magnetic properties
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Volts
Cables

49. What does static electricity do?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Does not move
Porcelain
Solenoid and Relay(both A and B)

50. Where do the fingers point in both Left-Hand Rules?
The direction of the magnetic field
Strength of the charge
12 volts
Resistance increases as the conductor length increases