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 property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
Opposition to movement of free electrons
Bonding and grounding
Purging

2. What is power?
Volts
Start with the band on the end and read to the center
20%
The rate of doing work

3. Where does the thumb point in both Left-Hand Rules?
1/1000th of an inch
75 Ohms
Grounding wire
The direction the negative charge moves

4. What are the two generic methods to eliminate static electricity from metal objects?
Bonding and grounding
Magnetic properties
Heat
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

5. What is the purpose of resistors in electrical circuits?
Common - not rechargable - gradually discharges when in storage(All of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Produce heat - light - or limit current to control it(all of the above)
Voltage

6. What is an electromagnet?
Wire splices
Symbol
Porcelain
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

7. What is another name for an inductor?
Fixed - Electrolytic - Variable(all of the above)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
1 watt
Choke

8. Identify the blueprint symbol for resistors.
Volts
Silver
--^V^V^V^---
DC flows continuously in one direction and AC potential difference and current both change direction

9. How is the heat production measured in a resistor?
Potential difference - E*I - current times current change from point to point(all of the above)
Moving vehicles
Start with the band on the end and read to the center
Volts

10. What does Ohm's Law represent?
Wire splices
Relationship between current and potential difference
Unlike poles attract
Purging

11. What is a type of capacitor?
Insulation resistance and Dielectric strength(Both A and B)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Fixed - Electrolytic - Variable(all of the above)
A magnetic field

12. What is the measure of potential difference?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Volts
Electromagnetism
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

13. What is voltage?
Does not move
Heat and current control(both a and c)
A difference in potential energy
5%

14. What is the difference between AC and DC?
Opposition to electrical current
Parallel
DC flows continuously in one direction and AC potential difference and current both change direction
Battery

15. Identify the general blueprint symbol for inductors.
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Symbol
Wire splices
1/1000th of an inch

16. What is a rigid metal conduit?
Potential difference - E*I - current times current change from point to point(all of the above)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Insulation resistance
Breakdown voltage

17. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
The direction the negative charge moves
Electromagnetic field
Common - not rechargable - gradually discharges when in storage(All of the above)
Voltage

18. What is resistance?
5%
Symbol
Opposition to movement of free electrons
Current change in a coil creates a magnetic change

19. The thermocouple uses which method for creating potential energy?
High resistance
Heat
Bare - covered - insulated - stranded - cable(All of the above)
Current change in a coil creates a magnetic change

20. What is the fundamental property of insulators?
First digit
Insulation resistance and Dielectric strength(Both A and B)
Composition of the resistor
Wire splices

21. What type of circuit has one path of follow through a load?
Series circuit
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Symbol
Opposes any change in the current flowing in a circuit

22. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Strength of the charge
Mutual induction
Parallel circuit
Stranded

23. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Does not move
Resistance increases as the conductor length increases
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
10%

24. What do we call the process of replacement of vapor above a liquid with a nonflammable gas?
Insulation resistance
The relationship of potential difference to current
Strength of the charge
Purging

25. What is a wire classification?
Start with the band on the end and read to the center
DC current
Bare - covered - insulated - stranded - cable(All of the above)
50 Ohms

26. What must be large enough to carry the largest current likely to occur?
Grounding wire
Wire splices
1 watt
Porcelain

27. Which material has the lowest resistance at ordinary temperatures?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
75 Ohms
Silver

28. What makes electrons flow?
How much potential difference can a material withstand before breaking down
Amperes
Potential difference
Relay

29. What is the relationship of conductor size and length to resistance?
The relationship of potential difference to current
Cables
Resistance increases as the conductor length increases
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

30. What is a way to classify wires and cables?
Heat
By their covering
Start with the band on the end and read to the center
Choke

31. What does an object have if a magnetic field acts on it?
Magnetic properties
Unlike poles attract
Cell
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)

32. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
50 Ohms
Opposition to electrical current
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Gauge number

33. What do electrical charges need to cause a fire or explosion?
Does not move
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Potential difference

34. The dry cell is what method for creating potential energy?
Breakdown voltage
Chemical action
Wire splices
Symbol

35. What is resistance in electrical terms?
Symbol
Cables
Opposition to electrical current
Mutual induction

36. What is an arrangement of materials that create a potential difference by chemistry?
Ohms
By their covering
Fixed - tapped - variable(all of the above)
Cell

37. What makes electrons flow?
Potential difference
Silver
Start with the band on the end and read to the center
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

38. When reading resistance color codes - what does the fourth band indicate?
Mutual induction
A magnetic field
Tolerence
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

39. What does a first band of white mean?
10%
Symbol
First digit is 9
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

40. What is the unit of measurement of resistance?
Symbol
Plastic - Rubber - Friction(all of the above)
Electromagnetism
Ohms

41. A resistor is color coded brown - green - orange. What is its resistance?
Common - not rechargable - gradually discharges when in storage(All of the above)
15 -000 ohms - 20%
Opposition to electrical current
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

42. What is capacitance in electrical terms?
20%
Choke
Ability to store an electric charge
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

43. What is a characteristic of a fixed resistor?
Resistance value can not be changed
1 watt
Opposition to electrical current
--^V^V^V^---

44. What is the name for electrical resistance of insulation?
Insulation resistance
Two
Ability to store an electric charge
Strength of the charge

45. What is a common measure of wire diameter?
From the negative battery terminal to the positive terminal
Electrical resistance against the flow of current
Silver
Gauge number

46. How is capacitance determined?
Amperes
Area and spacing of capacitor - static current in the capacitor(both A and B)
DC current
Chemical action

47. What instrument measures voltage?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Battery
Voltmeter
Energy

48. What information do the Left-Hand Rules provide?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Potential difference - E*I - current times current change from point to point(all of the above)
Purging
American wire gauge(AWG)

49. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Current change in a coil creates a magnetic change
20%
Strength of the charge
Opposition to electrical current

50. What can permanently break down a capacitor?
Volts
Choke
Breakdown voltage
5%