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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. What is a common cause of static electricity in a shop?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Moving vehicles
Energy
Produce heat - light - or limit current to control it(all of the above)

2. What is another name for an inductor?
Choke
Ability to store an electric charge
Opposition to electrical current
Voltmeter

3. What must be large enough to carry the largest current likely to occur?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Start with the band on the end and read to the center
Ability to store an electric charge
Grounding wire

4. What does a transformer transform?
10
The relationship of potential difference to current
Insulation resistance
Symbol

5. What is the type of cable composed of many fine wires?
--^V^V^V^---
Mutual induction
How much potential difference can a material withstand before breaking down
Stranded

6. What can permanently break down a capacitor?
High resistance
Voltmeter
Breakdown voltage
5%

7. What is an arrangement of materials that create a potential difference by chemistry?
Bare - covered - insulated - stranded - cable(All of the above)
Potential difference - E*I - current times current change from point to point(all of the above)
Cell
Use an effect to produce another effect

8. What is a common form used in conductors?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Current change in a coil creates a magnetic change
Circular and square mills(Both A and B)
Cables

9. Which way is the current going in the circuit shown?(electron flow)
DC flows continuously in one direction and AC potential difference and current both change direction
From the negative battery terminal to the positive terminal
Symbol
10%

10. What type of circuit has two or more paths for current to follow?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Parallel circuit
Ohms

11. What does Ohm's Law represent?
Relay
Bare - covered - insulated - stranded - cable(All of the above)
Ohms
Relationship between current and potential difference

12. Why is the transformer important to AC electricity?

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13. What do we call the ability to do work?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Energy
American wire gauge(AWG)
10

14. What is a property of inductors in electrical circuits?
Parallel circuit
Opposes any change in the current flowing in a circuit
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)
15 -000 ohms - 20%

15. What is the measure of potential difference?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Volts
Heat and current control(both a and c)
The direction of the magnetic field

16. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Current flows in one direction - potential differences across a load does not change(Both A and B)
Magnetic properties
20%
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

17. What is an electromagnet?
Ohms
Opposes any change in the current flowing in a circuit
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Unlike poles attract

18. What do junction boxes protect?
Voltmeter
Ability to store an electric charge
Ohms
Wire splices

19. Given R=E / I and the following information - plug in the data and solve the problem for resistance. 1.5 volt walkman battery - 0.02 amps of current
Circular and square mills(Both A and B)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
75 Ohms
50 Ohms

20. What is the purpose of resistors in electrical circuits?
DC flows continuously in one direction and AC potential difference and current both change direction
Produce heat - light - or limit current to control it(all of the above)
Start with the band on the end and read to the center
Symbol

21. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Circular and square mills(Both A and B)
Parallel
Serial
Insulation resistance and Dielectric strength(Both A and B)

22. What is the purpose of a raceway?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
1 watt
First digit
Volts

23. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
American wire gauge(AWG)
Unlike poles attract
10%
Heat

24. What makes electrons flow?
10
Fixed - Electrolytic - Variable(all of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Potential difference

25. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
High resistance
Voltage
Fixed - Electrolytic - Variable(all of the above)
Electromagnetism

26. What is power?
1/1000th of an inch
Ohms
Stores electrical charge
The rate of doing work

27. A resistor is color coded brown - green - orange. What is its resistance?
The direction the negative charge moves
Magnetic properties
15 -000 ohms - 20%
Common - not rechargable - gradually discharges when in storage(All of the above)

28. What types of protective tapes are used?
Use an effect to produce another effect
First digit
Insulation resistance and Dielectric strength(Both A and B)
Plastic - Rubber - Friction(all of the above)

29. What is a type of capacitor?
Electromagnetic field
Fixed - Electrolytic - Variable(all of the above)
American wire gauge(AWG)
High resistance

30. What is induction?
Volts
Current change in a coil creates a magnetic change
Electromagnetic field
Tolerence

31. What determines whether a spark can be produced?
Strength of the charge
Volts
Resistance value can not be changed
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

32. Which type of cell can be recharged?
Wire splices
Secondary cell
A magnetic field
Opposition to electrical current

33. How do you read resistor color codes?
Start with the band on the end and read to the center
A difference in potential energy
The direction the negative charge moves
Stranded

34. What is the name for electrical resistance of insulation?
Alternating current
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
20%
Insulation resistance

35. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Ohms
Alternating current
The direction of the magnetic field

36. Identify the blueprint symbol for resistors.
--^V^V^V^---
Plastic - Rubber - Friction(all of the above)
50 Ohms
Secondary cell

37. What is the unit of measurement of electrical current?
Amperes
Heat and current control(both a and c)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

38. What is a conductor?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Heat and current control(both a and c)
Circular and square mills(Both A and B)
Potential difference

39. When reading resistance color codes - what does the first band indicate?
12 volts
First digit
Cells can be connected together to make a battery
10

40. What does resistance produce?
Potential difference
Volts
Heat
20%

41. What is the difference between AC and DC?
Moving vehicles
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
DC flows continuously in one direction and AC potential difference and current both change direction

42. How is the heat production measured in a resistor?
Resistance increases as the conductor length increases
Relay
Potential difference - E*I - current times current change from point to point(all of the above)
Volts

43. What is a rigid metal conduit?
Start with the band on the end and read to the center
Voltage
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Unlike poles attract

44. What is true about a dry cell?
Ability to store an electric charge
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)
Solenoid and Relay(both A and B)

45. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Alternating current
Heat
Ohms
Mutual induction

46. When does a DC circuit oppose current flow?
High resistance
Strength of the charge
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
DC flows continuously in one direction and AC potential difference and current both change direction

47. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Bonding and grounding
Tolerence
Relationship between current and potential difference
Parallel

48. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
5%
Cells can be connected together to make a battery
Voltage
Bonding and grounding

49. In most applications - what remains constant if the current remains constant and flows in one direction?
1 watt
Current change in a coil creates a magnetic change
Solenoid and Relay(both A and B)
Electromagnetic field

50. Where does the thumb point in both Left-Hand Rules?
Plastic - Rubber - Friction(all of the above)
Bonding and grounding
The direction the negative charge moves
Mutual induction