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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 resistors in electrical circuits?
Composition of the resistor
High resistance
Relay
Produce heat - light - or limit current to control it(all of the above)

2. What is the relationship of conductor size and length to resistance?
Resistance increases as the conductor length increases
10%
Energy
A magnetic field

3. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Resistance increases as the conductor length increases
Voltage
The direction the negative charge moves

4. What instrument measures voltage?
Serial
Heat
The relationship of potential difference to current
Voltmeter

5. What is capacitance in electrical terms?
Electromagnetic field
Electrical resistance against the flow of current
First digit
Ability to store an electric charge

6. To what measurement do the conductor mills refer?
Chemical action
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
1/1000th of an inch

7. What is the name for electrical resistance of insulation?
Electromagnetism
Common - not rechargable - gradually discharges when in storage(All of the above)
Insulation resistance
Opposition to movement of free electrons

8. Which way is the current going in the circuit shown?(electron flow)
First digit is 9
Volts
From the negative battery terminal to the positive terminal
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

9. In most applications - what remains constant if the current remains constant and flows in one direction?
Composition of the resistor
Amperes
Volts
Electromagnetic field

10. A resistor is color coded brown - green - orange. What is its resistance?
High resistance
15 -000 ohms - 20%
Plastic - Rubber - Friction(all of the above)
Volts

11. What are the common units of measurement for round and square conductor cross - sections?
Circular and square mills(Both A and B)
Tolerence
Amperes
High resistance

12. What does static electricity do?
A difference in potential energy
Battery
Composition of the resistor
Does not move

13. How many kinds of poles do magnets have?
Serial
Opposes any change in the current flowing in a circuit
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Two

14. What is dielectric strength?
Common - not rechargable - gradually discharges when in storage(All of the above)
How much potential difference can a material withstand before breaking down
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Silver

15. What do we call the ability to do work?
Plastic - Rubber - Friction(all of the above)
Tolerence
10
Energy

16. How is capacitance determined?
Circular and square mills(Both A and B)
Electromagnetic field
Area and spacing of capacitor - static current in the capacitor(both A and B)
Amperes

17. What is a characteristic of a fixed resistor?
Choke
Resistance value can not be changed
DC current
Solenoid and Relay(both A and B)

18. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
10%
Unlike poles attract
Gauge number

19. 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)
Parallel circuit
Serial
Fixed - tapped - variable(all of the above)

20. 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
Resistance value can not be changed
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
12 volts
Fixed - tapped - variable(all of the above)

21. What is a property of inductors in electrical circuits?
Heat and current control(both a and c)
Opposes any change in the current flowing in a circuit
Chemical action
Cell

22. How do static charges distribute themselves?
Relay
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Tolerence
First digit is 9

23. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
DC current
Plastic - Rubber - Friction(all of the above)
Mutual induction
50 Ohms

24. What is a common measure of wire diameter?
The direction the negative charge moves
Heat
Gauge number
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

25. What determines whether a spark can be produced?
Use an effect to produce another effect
Strength of the charge
Composition of the resistor
Symbol

26. When reading resistance color codes - what does the first band indicate?
Ohms
Cell
By their covering
First digit

27. Where do the fingers point in both Left-Hand Rules?
Symbol
Cell
Relay
The direction of the magnetic field

28. What is voltage?
Stores electrical charge
A difference in potential energy
A magnetic field
Gauge number

29. Which of the following materials is NOT a good conductor?
Porcelain
Potential difference
Circular and square mills(Both A and B)
Plastic - Rubber - Friction(all of the above)

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

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

32. What is a DC circuit characteristic?
Solenoid and Relay(both A and B)
Secondary cell
Current flows in one direction - potential differences across a load does not change(Both A and B)
Heat

33. What information do the Left-Hand Rules provide?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Moving vehicles
Produce heat - light - or limit current to control it(all of the above)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

34. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Alternating current
Bonding and grounding
Common - not rechargable - gradually discharges when in storage(All of the above)
The direction of the magnetic field

35. What is the fundamental property of insulators?
--^V^V^V^---
Electromagnetism
Symbol
Insulation resistance and Dielectric strength(Both A and B)

36. What is a characteristic of insulators?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
A difference in potential energy
Opposition to movement of free electrons
Wire splices

37. What is a type of mechanical transducer?
Breakdown voltage
Solenoid and Relay(both A and B)
Circular and square mills(Both A and B)
Cables

38. Which material has the lowest resistance at ordinary temperatures?
Cell
Serial
Silver
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

39. 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
Wire splices
Potential difference
Heat and current control(both a and c)
75 Ohms

40. What is a common cause of static electricity in a shop?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Moving vehicles
Ohms
20%

41. What is the basic law of magnetic force?
First digit is 9
Porcelain
Unlike poles attract
Heat

42. What is the term for doing work at the rate of joule per second?
Porcelain
1 watt
50 Ohms
Plastic - Rubber - Friction(all of the above)

43. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Electromagnetic field
Mutual induction
1/1000th of an inch
Electrical resistance against the flow of current

44. What is a way to classify wires and cables?
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)
By their covering
Cables
High resistance

45. What makes electrons flow?
Insulation resistance
Potential difference
The direction the negative charge moves
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

46. What results when current is run through a material with high resistance?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Heat and current control(both a and c)
A difference in potential energy
Serial

47. What is the relationship between magnetism and electricity?
The direction of the magnetic field
Cells can be connected together to make a battery
Ohms
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)

48. What is power?
Ability to store an electric charge
Unlike poles attract
Voltmeter
The rate of doing work

49. What types of protective tapes are used?
10
The direction the negative charge moves
Plastic - Rubber - Friction(all of the above)
Fixed - Electrolytic - Variable(all of the above)

50. What is a wire classification?
Electromagnetic field
Bare - covered - insulated - stranded - cable(All of the above)
Relay
Cells can be connected together to make a battery