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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. The generator is what method of creating potential energy?
Electromagnetism
Series circuit
Parallel
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

2. What is resistance in electrical terms?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Current change in a coil creates a magnetic change
Electromagnetism
Opposition to electrical current

3. What is voltage?
Opposition to movement of free electrons
How much potential difference can a material withstand before breaking down
A difference in potential energy
Relationship between current and potential difference

4. What is the unit of measurement of resistance?
Choke
Amperes
Ohms
Parallel

5. What is a DC circuit characteristic?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Insulation resistance
Current flows in one direction - potential differences across a load does not change(Both A and B)
Moving vehicles

6. When reading resistance color codes - what does the first band indicate?
Voltmeter
Cells can be connected together to make a battery
First digit
Parallel

7. What type of circuit has two or more paths for current to follow?
Parallel circuit
Voltage
Ability to store an electric charge
Relationship between current and potential difference

8. What is a switch that operates by electricity?
Relay
Volts
Symbol
A magnetic field

9. The thermocouple uses which method for creating potential energy?
Serial
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Plastic - Rubber - Friction(all of the above)
Heat

10. Where do the fingers point in both Left-Hand Rules?
The direction of the magnetic field
Cables
The direction the negative charge moves
1/1000th of an inch

11. Which of the following is a type of resistor?
Fixed - tapped - variable(all of the above)
A difference in potential energy
Voltmeter
Fixed - Electrolytic - Variable(all of the above)

12. How many kinds of poles do magnets have?
Secondary cell
Two
Parallel
By their covering

13. What is an electromagnet?
--^V^V^V^---
Breakdown voltage
The direction of the magnetic field
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

14. What is resistance?
Symbol
1 watt
Opposition to electrical current
Opposition to movement of free electrons

15. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
First digit
Produce heat - light - or limit current to control it(all of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)
Voltage

16. What is another name for an inductor?
Start with the band on the end and read to the center
Potential difference
Composition of the resistor
Choke

17. What is dielectric strength?
Volts
Moving vehicles
Fixed - tapped - variable(all of the above)
How much potential difference can a material withstand before breaking down

18. What is the purpose of resistors in electrical circuits?
DC flows continuously in one direction and AC potential difference and current both change direction
15 -000 ohms - 20%
Produce heat - light - or limit current to control it(all of the above)
--^V^V^V^---

19. What is a type of capacitor?
--^V^V^V^---
From the negative battery terminal to the positive terminal
Fixed - Electrolytic - Variable(all of the above)
Does not move

20. Which way is the current going in the circuit shown?(electron flow)
From the negative battery terminal to the positive terminal
20%
Tolerence
The direction the negative charge moves

21. What are the names of two of the six primary methods of producing a voltage?
Bare - covered - insulated - stranded - cable(All of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Gauge number
Amperes

22. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Alternating current
Does not move
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

23. What is the term for doing work at the rate of joule per second?
1 watt
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Composition of the resistor

24. What is true about a dry cell?
High resistance
Common - not rechargable - gradually discharges when in storage(All of the above)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
The direction of the magnetic field

25. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Silver
5%
20%
Heat and current control(both a and c)

26. What are the two generic methods to eliminate static electricity from metal objects?
Potential difference - E*I - current times current change from point to point(all of the above)
5%
Bonding and grounding
Magnetic properties

27. What do electrical charges need to cause a fire or explosion?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
By their covering
Current change in a coil creates a magnetic change
Volts

28. What is the type of cable composed of many fine wires?
Stranded
10%
Magnetic properties
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

29. What is a common cause of static electricity in a shop?
Unlike poles attract
--^V^V^V^---
Moving vehicles
Choke

30. What do transducers do in electrical terms?
Secondary cell
Use an effect to produce another effect
Voltage
Parallel circuit

31. What does a first band of white mean?
Ohms
1 watt
Opposition to electrical current
First digit is 9

32. What does resistance produce?
Plastic - Rubber - Friction(all of the above)
Produce heat - light - or limit current to control it(all of the above)
Heat
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)

33. What is a type of mechanical transducer?
Stranded
Solenoid and Relay(both A and B)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Opposition to electrical current

34. What is a characteristic of insulators?
5%
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
20%
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

35. What must be large enough to carry the largest current likely to occur?
Symbol
Grounding wire
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Choke

36. What is the basic law of magnetic force?
Amperes
Potential difference
Start with the band on the end and read to the center
Unlike poles attract

37. What types of protective tapes are used?
Cables
Plastic - Rubber - Friction(all of the above)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
A difference in potential energy

38. To what measurement do the conductor mills refer?
Stores electrical charge
Gauge number
Ability to store an electric charge
1/1000th of an inch

39. What do we call the ability to do work?
Energy
Resistance value can not be changed
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)
Solenoid and Relay(both A and B)

40. What results when current is run through a material with high resistance?
Insulation resistance and Dielectric strength(Both A and B)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Produce heat - light - or limit current to control it(all of the above)
Heat and current control(both a and c)

41. What is the term for two or more cells attached together?
Resistance increases as the conductor length increases
Battery
Stranded
Bare - covered - insulated - stranded - cable(All of the above)

42. When does a DC circuit oppose current flow?
Bare - covered - insulated - stranded - cable(All of the above)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Cables

43. What information do the Left-Hand Rules provide?
Fixed - Electrolytic - Variable(all of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Magnetic properties
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

44. What makes electrons flow?
Parallel
Potential difference
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Cables

45. Why is the transformer important to AC electricity?

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46. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Parallel
Opposition to electrical current
Area and spacing of capacitor - static current in the capacitor(both A and B)

47. What is a wire classification?
Bare - covered - insulated - stranded - cable(All of the above)
Breakdown voltage
Battery
Porcelain

48. What is a rigid metal conduit?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
10
Stranded

49. 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
Area and spacing of capacitor - static current in the capacitor(both A and B)
The direction the negative charge moves
12 volts
Choke

50. Where does the thumb point in both Left-Hand Rules?
Moving vehicles
The direction the negative charge moves
Stores electrical charge
Voltage