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. Where does the thumb point in both Left-Hand Rules?
The direction the negative charge moves
1 watt
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Volts

2. What does a third band of brown mean?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
10
Stranded
The direction the negative charge moves

3. What is the unit of measurement of electrical current?
Series circuit
Amperes
Common - not rechargable - gradually discharges when in storage(All of the above)
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)

4. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
Produce heat - light - or limit current to control it(all of the above)
Two
Circular and square mills(Both A and B)

5. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Mutual induction
Porcelain

6. What are the two generic methods to eliminate static electricity from metal objects?
Cables
Bonding and grounding
Strength of the charge
Voltmeter

7. What do electrical charges need to cause a fire or explosion?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Use an effect to produce another effect
Potential difference - E*I - current times current change from point to point(all of the above)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

8. What types of protective tapes are used?
The direction the negative charge moves
Potential difference - E*I - current times current change from point to point(all of the above)
Serial
Plastic - Rubber - Friction(all of the above)

9. What does Ohm's Law represent?
Plastic - Rubber - Friction(all of the above)
Wire splices
Two
Relationship between current and potential difference

10. What is induction?
Heat and current control(both a and c)
Stores electrical charge
Current change in a coil creates a magnetic change
Use an effect to produce another effect

11. What is an electromagnet?
Composition of the resistor
Area and spacing of capacitor - static current in the capacitor(both A and B)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Does not move

12. What does resistance produce?
A difference in potential energy
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Parallel circuit
Heat

13. What is insulation resistance?
DC current
Potential difference - E*I - current times current change from point to point(all of the above)
Electrical resistance against the flow of current
Cables

14. What is the purpose of resistors in electrical circuits?
Produce heat - light - or limit current to control it(all of the above)
Moving vehicles
Relationship between current and potential difference
The relationship of potential difference to current

15. Which way is the current going in the circuit shown?(electron flow)
From the negative battery terminal to the positive terminal
Solenoid and Relay(both A and B)
Common - not rechargable - gradually discharges when in storage(All of the above)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

16. What is the purpose of capacitors in electrical circuits?
First digit
Stores electrical charge
Relationship between current and potential difference
Silver

17. What is resistance in electrical terms?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Relationship between current and potential difference
Alternating current
Opposition to electrical current

18. Which material has the lowest resistance at ordinary temperatures?
Produce heat - light - or limit current to control it(all of the above)
Wire splices
Stores electrical charge
Silver

19. What is a way to classify wires and cables?
A difference in potential energy
Silver
Does not move
By their covering

20. What is power?
1 watt
The rate of doing work
Bonding and grounding
50 Ohms

21. To what measurement do the conductor mills refer?
Bonding and grounding
Voltmeter
The relationship of potential difference to current
1/1000th of an inch

22. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Two
Voltage
75 Ohms
10

23. When reading resistance color codes - what does the fourth band indicate?
Electromagnetism
Opposes any change in the current flowing in a circuit
First digit is 9
Tolerence

24. Which of the following materials is NOT a good conductor?
Battery
Porcelain
20%
Stranded

25. What is true about a dry cell?
Bare - covered - insulated - stranded - cable(All of the above)
20%
Voltage
Common - not rechargable - gradually discharges when in storage(All of the above)

26. What do transducers do in electrical terms?
Fixed - Electrolytic - Variable(all of the above)
Chemical action
Wire splices
Use an effect to produce another effect

27. What is the relationship between magnetism and electricity?
Porcelain
Opposition to electrical 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)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

28. What instrument measures voltage?
1 watt
Opposition to electrical current
Voltmeter
Circular and square mills(Both A and B)

29. The thermocouple uses which method for creating potential energy?
Secondary cell
Moving vehicles
Heat
Symbol

30. What is the unit of measurement of resistance?
Opposition to electrical current
Ohms
10%
20%

31. What wire measurement is commonly used in the U.S.?
American wire gauge(AWG)
10%
Magnetic properties
Solenoid and Relay(both A and B)

32. The dry cell is what method for creating potential energy?
Chemical action
Potential difference - E*I - current times current change from point to point(all of the above)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
High resistance

33. Which of the following is a type of resistor?
Voltage
A difference in potential energy
Fixed - tapped - variable(all of the above)
Secondary cell

34. What is voltage?
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 difference in potential energy
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Breakdown voltage

35. What type of circuit has one path of follow through a load?
Electromagnetic field
Series circuit
Electromagnetism
The rate of doing work

36. What is a rigid metal conduit?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Ability to store an electric charge
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
By their covering

37. What does static electricity do?
Circular and square mills(Both A and B)
Serial
Does not move
Symbol

38. What does an object have if a magnetic field acts on it?
A magnetic field
Gauge number
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Magnetic properties

39. What is a characteristic of insulators?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
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)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

40. What are the common units of measurement for round and square conductor cross - sections?
Battery
Insulation resistance and Dielectric strength(Both A and B)
Circular and square mills(Both A and B)
Two

41. Which type of cell can be recharged?
Symbol
Voltage
DC flows continuously in one direction and AC potential difference and current both change direction
Secondary cell

42. In most applications - what remains constant if the current remains constant and flows in one direction?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
A difference in potential energy
Electromagnetic field
Wire splices

43. What does a transformer transform?
Alternating current
The relationship of potential difference to current
From the negative battery terminal to the positive terminal
Cell

44. 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
The direction of the magnetic field
Porcelain
Choke

45. What do we call the ability to do work?
Silver
Energy
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Bare - covered - insulated - stranded - cable(All of the above)

46. What is dielectric strength?
Potential difference - E*I - current times current change from point to point(all of the above)
How much potential difference can a material withstand before breaking down
Insulation resistance
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

47. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Mutual induction
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Heat
Insulation resistance

48. What is the use of the electromagnet?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Solenoid and Relay(both A and B)
50 Ohms
Voltmeter

49. What is the term for doing work at the rate of joule per second?
Cells can be connected together to make a battery
1 watt
Opposition to electrical current
By their covering

50. What is the difference between AC and DC?
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
Volts
Battery