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 does a third band of brown mean?
Wire splices
Amperes
By their covering
10

2. What is a characteristic of a fixed resistor?
The direction of the magnetic field
The rate of doing work
10
Resistance value can not be changed

3. What is resistance in electrical terms?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Does not move
Opposition to electrical current
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)

4. When reading resistance color codes - what does the fourth band indicate?
High resistance
Tolerence
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
DC current

5. What is the relationship between magnetism and electricity?
Serial
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)
Opposition to electrical current
Relationship between current and potential difference

6. What is the use of the electromagnet?
Two
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
High resistance
Wire splices

7. Which of the following is a type of resistor?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Plastic - Rubber - Friction(all of the above)
Fixed - tapped - variable(all of the above)
American wire gauge(AWG)

8. The thermocouple uses which method for creating potential energy?
12 volts
Heat
Grounding wire
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

9. What is the purpose of a raceway?
A difference in potential energy
High resistance
Use an effect to produce another effect
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

10. The generator is what method of creating potential energy?
Heat and current control(both a and c)
Electromagnetism
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)
Stores electrical charge

11. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Resistance increases as the conductor length increases
Fixed - Electrolytic - Variable(all of the above)
Voltage
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

12. What is the unit of measurement of resistance?
Ohms
Strength of the charge
Circular and square mills(Both A and B)
Start with the band on the end and read to the center

13. What is a common form used in conductors?
Common - not rechargable - gradually discharges when in storage(All of the above)
Volts
Cables
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

14. What is a type of mechanical transducer?
First digit
Solenoid and Relay(both A and B)
10
From the negative battery terminal to the positive terminal

15. What is a DC circuit characteristic?
How much potential difference can a material withstand before breaking down
Current flows in one direction - potential differences across a load does not change(Both A and B)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Symbol

16. What is the measure of potential difference?
Use an effect to produce another effect
Volts
Current flows in one direction - potential differences across a load does not change(Both A and B)
Parallel

17. Where do the fingers point in both Left-Hand Rules?
Cell
Start with the band on the end and read to the center
Two
The direction of the magnetic field

18. What does a transformer transform?
First digit
Does not move
The relationship of potential difference to current
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

19. What makes electrons flow?
Potential difference
Insulation resistance and Dielectric strength(Both A and B)
Current change in a coil creates a magnetic change
The relationship of potential difference to current

20. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Electrical resistance against the flow of current
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
First digit
Mutual induction

21. What is a switch that operates by electricity?
Start with the band on the end and read to the center
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Relay
50 Ohms

22. What is a characteristic of insulators?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Bare - covered - insulated - stranded - cable(All of the above)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Potential difference

23. What is an electromagnet?
Stores electrical charge
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
How much potential difference can a material withstand before breaking down
The direction the negative charge moves

24. What does a first band of white mean?
Moving vehicles
Symbol
Insulation resistance
First digit is 9

25. Which material has the lowest resistance at ordinary temperatures?
Parallel circuit
First digit is 9
Voltmeter
Silver

26. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Serial
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
DC current
Silver

27. Identify the blueprint symbol for capacitors.
1/1000th of an inch
Symbol
A magnetic field
First digit is 9

28. What is a wire classification?
Bare - covered - insulated - stranded - cable(All of the above)
20%
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
DC flows continuously in one direction and AC potential difference and current both change direction

29. What must be large enough to carry the largest current likely to occur?
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)
Resistance value can not be changed
Heat
Grounding wire

30. What do electrical charges need to cause a fire or explosion?
Resistance increases as the conductor length increases
Opposition to movement of free electrons
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

31. What is insulation resistance?
By their covering
Parallel circuit
American wire gauge(AWG)
Electrical resistance against the flow of current

32. What is a way to classify wires and cables?
Voltmeter
By their covering
Insulation resistance and Dielectric strength(Both A and B)
Series circuit

33. What is a common cause of static electricity in a shop?
Strength of the charge
Common - not rechargable - gradually discharges when in storage(All of the above)
Moving vehicles
Gauge number

34. What is the type of cable composed of many fine wires?
--^V^V^V^---
Stranded
Fixed - tapped - variable(all of the above)
Potential difference

35. What does static electricity do?
Battery
Does not move
50 Ohms
Potential difference - E*I - current times current change from point to point(all of the above)

36. What makes electrons flow?
Potential difference
10
Voltage
Ohms

37. What does a moving charge produce?
A magnetic field
Plastic - Rubber - Friction(all of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Chemical action

38. What do transducers do in electrical terms?
Resistance value can not be changed
Common - not rechargable - gradually discharges when in storage(All of the above)
First digit
Use an effect to produce another effect

39. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
5%
Volts
Gauge number

40. What is another name for an inductor?
Secondary cell
Electrical resistance against the flow of current
Current change in a coil creates a magnetic change
Choke

41. What can permanently break down a capacitor?
Cell
Breakdown voltage
DC current
Relay

42. Identify the blueprint symbol for resistors.
--^V^V^V^---
Porcelain
Use an effect to produce another effect
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

43. What wire measurement is commonly used in the U.S.?
American wire gauge(AWG)
Unlike poles attract
Parallel
The relationship of potential difference to current

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
Strength of the charge
1/1000th of an inch
Cells can be connected together to make a battery

45. What determines the resistance of a resistor?
Electrical resistance against the flow of current
Porcelain
50 Ohms
Composition of the resistor

46. What is needed for electric heating elements and the filaments of light bulbs?
Breakdown voltage
High resistance
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
50 Ohms

47. In most applications - what remains constant if the current remains constant and flows in one direction?
5%
A difference in potential energy
Electromagnetic field
First digit

48. What type of circuit has two or more paths for current to follow?
Cell
The direction of the magnetic field
From the negative battery terminal to the positive terminal
Parallel circuit

49. What are the names of two of the six primary methods of producing a voltage?
Fixed - Electrolytic - Variable(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Secondary cell
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

50. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Parallel
Electrical resistance against the flow of current
Current change in a coil creates a magnetic change
5%