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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 the purpose of capacitors in electrical circuits?
Stores electrical charge
Grounding wire
Breakdown voltage
Symbol

2. When reading resistance color codes - what does the first band indicate?
First digit
Circular and square mills(Both A and B)
Does not move
Electromagnetic field

3. Identify the general blueprint symbol for inductors.
Symbol
Opposes any change in the current flowing in a circuit
Cables
50 Ohms

4. What is an electromagnet?
5%
Potential difference
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

5. A resistor is color coded brown - green - orange. What is its resistance?
15 -000 ohms - 20%
Cables
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
How much potential difference can a material withstand before breaking down

6. What is the difference between AC and DC?
Bonding and grounding
--^V^V^V^---
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
DC flows continuously in one direction and AC potential difference and current both change direction

7. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
15 -000 ohms - 20%
Insulation resistance
Serial
Parallel

8. What is the relationship of conductor size and length to resistance?
By their covering
Cells can be connected together to make a battery
Resistance increases as the conductor length increases
50 Ohms

9. Why is the transformer important to AC electricity?

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10. Where do the fingers point in both Left-Hand Rules?
Grounding wire
The direction of the magnetic field
Alternating current
Relay

11. What is resistance?
5%
Opposition to movement of free electrons
A magnetic field
DC flows continuously in one direction and AC potential difference and current both change direction

12. What is voltage?
A difference in potential energy
Gauge number
Breakdown voltage
Composition of the resistor

13. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
The direction the negative charge moves
50 Ohms
High resistance

14. What is an arrangement of materials that create a potential difference by chemistry?
American wire gauge(AWG)
The relationship of potential difference to current
Unlike poles attract
Cell

15. What makes electrons flow?
Electrical resistance against the flow of current
Potential difference
Serial
Two

16. What is a wire classification?
Volts
Bare - covered - insulated - stranded - cable(All of the above)
A magnetic field
20%

17. Identify the blueprint symbol for resistors.
Insulation resistance
Does not move
Plastic - Rubber - Friction(all of the above)
--^V^V^V^---

18. Where does the thumb point in both Left-Hand Rules?
Secondary cell
Area and spacing of capacitor - static current in the capacitor(both A and B)
Ohms
The direction the negative charge moves

19. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
20%
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
5%
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)

20. What are the names of two of the six primary methods of producing a voltage?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
10
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Serial

21. What is a switch that operates by electricity?
DC flows continuously in one direction and AC potential difference and current both change direction
Mutual induction
Relay
Battery

22. What determines whether a spark can be produced?
How much potential difference can a material withstand before breaking down
Wire splices
Strength of the charge
Voltage

23. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Bonding and grounding
Voltage
Cables

24. What is the purpose of resistors in electrical circuits?
Produce heat - light - or limit current to control it(all of the above)
Volts
Heat and current control(both a and c)
The direction of the magnetic field

25. What is the term for two or more cells attached together?
High resistance
1/1000th of an inch
Voltmeter
Battery

26. What are the common units of measurement for round and square conductor cross - sections?
Circular and square mills(Both A and B)
Cell
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)

27. How do static charges distribute themselves?
A difference in potential energy
Ohms
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

28. What does Ohm's Law represent?
Relationship between current and potential difference
Ability to store an electric charge
Symbol
Heat

29. What is a characteristic of insulators?
Plastic - Rubber - Friction(all of the above)
Energy
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Voltage

30. What does resistance produce?
High resistance
From the negative battery terminal to the positive terminal
Heat
Volts

31. What does static electricity do?
Voltage
Does not move
The direction the negative charge moves
Series circuit

32. 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
Composition of the resistor
Stores electrical charge
75 Ohms
1 watt

33. What is a DC circuit characteristic?
Opposition to electrical current
Current flows in one direction - potential differences across a load does not change(Both A and B)
Volts
Mutual induction

34. What is a conductor?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Bonding and grounding
1/1000th of an inch
Silver

35. What is a common cause of static electricity in a shop?
10%
From the negative battery terminal to the positive terminal
Moving vehicles
The direction the negative charge moves

36. What makes electrons flow?
Stranded
Potential difference
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Use an effect to produce another effect

37. What is the unit of measurement of electrical current?
A difference in potential energy
Chemical action
Amperes
Relay

38. 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
Current change in a coil creates a magnetic change
Use an effect to produce another effect
Resistance increases as the conductor length increases

39. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Silver
20%
Magnetic properties
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

40. What can permanently break down a capacitor?
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)
Alternating current
Breakdown voltage
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

41. Which way is the current going in the circuit shown?(electron flow)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
The direction of the magnetic field
The direction the negative charge moves
From the negative battery terminal to the positive terminal

42. What determines the resistance of a resistor?
By their covering
Electrical resistance against the flow of current
Composition of the resistor
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

43. What is power?
The rate of doing work
75 Ohms
Does not move
Battery

44. What is the unit of measurement of resistance?
20%
Ohms
Grounding wire
High resistance

45. What does a moving charge produce?
Serial
A magnetic field
Opposition to electrical current
Cells can be connected together to make a battery

46. The thermocouple uses which method for creating potential energy?
Serial
From the negative battery terminal to the positive terminal
Heat
Fixed - tapped - variable(all of the above)

47. What types of protective tapes are used?
Opposition to electrical current
Purging
Plastic - Rubber - Friction(all of the above)
Electrical resistance against the flow of current

48. What is the type of cable composed of many fine wires?
Insulation resistance
Series circuit
Fixed - tapped - variable(all of the above)
Stranded

49. What is the basic law of magnetic force?
Cell
Unlike poles attract
Series circuit
10%

50. What does a third band of brown mean?
Current change in a coil creates a magnetic change
First digit
10
Stores electrical charge