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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 information do the Left-Hand Rules provide?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
1/1000th of an inch
Resistance increases as the conductor length increases
Common - not rechargable - gradually discharges when in storage(All of the above)

2. A resistor is color coded brown - green - orange. What is its resistance?
15 -000 ohms - 20%
Common - not rechargable - gradually discharges when in storage(All of the above)
Current flows in one direction - potential differences across a load does not change(Both A and B)
Choke

3. When does a DC circuit oppose current flow?
Volts
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Strength of the charge

4. What is the use of the electromagnet?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Bonding and grounding
Fixed - Electrolytic - Variable(all of the above)
How much potential difference can a material withstand before breaking down

5. What results when current is run through a material with high resistance?
Solenoid and Relay(both A and B)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Heat and current control(both a and c)
10%

6. How many kinds of poles do magnets have?
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)
Two
Solenoid and Relay(both A and B)

7. What can permanently break down a capacitor?
Cables
1/1000th of an inch
Breakdown voltage
Symbol

8. What does resistance produce?
Stranded
15 -000 ohms - 20%
1 watt
Heat

9. What must be large enough to carry the largest current likely to occur?
Stranded
Electromagnetism
Magnetic properties
Grounding wire

10. What is the name for electrical resistance of insulation?
Insulation resistance
Stores electrical charge
Voltage
DC flows continuously in one direction and AC potential difference and current both change direction

11. What do transducers do in electrical terms?
Use an effect to produce another effect
Strength of the charge
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Voltage

12. What is the relationship of conductor size and length to resistance?
Resistance increases as the conductor length increases
Use an effect to produce another effect
--^V^V^V^---
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

13. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Stores electrical charge
Bonding and grounding
Does not move
Parallel

14. What is a common cause of static electricity in a shop?
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Porcelain
Moving vehicles

15. What determines the resistance of a resistor?
Opposes any change in the current flowing in a circuit
First digit
Heat and current control(both a and c)
Composition of the resistor

16. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
The relationship of potential difference to current
Voltage
Secondary cell
12 volts

17. What is a type of capacitor?
Bonding and grounding
50 Ohms
Potential difference - E*I - current times current change from point to point(all of the above)
Fixed - Electrolytic - Variable(all of the above)

18. What does a transformer transform?
Electromagnetic field
Battery
The relationship of potential difference to current
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)

19. What is a characteristic of insulators?
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Common - not rechargable - gradually discharges when in storage(All of the above)
Volts
Wire splices

20. To what measurement do the conductor mills refer?
Potential difference - E*I - current times current change from point to point(all of the above)
Voltage
The relationship of potential difference to current
1/1000th of an inch

21. How do static charges distribute themselves?
Heat and current control(both a and c)
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Relationship between current and potential difference
Two

22. What is the unit of measurement of electrical current?
Amperes
Serial
The rate of doing work
Wire splices

23. What is voltage?
Breakdown voltage
A difference in potential energy
Electromagnetism
Common - not rechargable - gradually discharges when in storage(All of the above)

24. What is the unit of measurement of potential difference?
Bonding and grounding
Volts
Wire splices
Current change in a coil creates a magnetic change

25. What type of circuit has two or more paths for current to follow?
Produce heat - light - or limit current to control it(all of the above)
Parallel circuit
Volts
A difference in potential energy

26. What is a way to classify wires and cables?
Composition of the resistor
Alternating current
By their covering
Use an effect to produce another effect

27. In most applications - what remains constant if the current remains constant and flows in one direction?
Breakdown voltage
Series circuit
Opposition to electrical current
Electromagnetic field

28. What is the type of cable composed of many fine wires?
Stranded
Porcelain
1/1000th of an inch
Silver

29. What makes electrons flow?
Purging
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
12 volts
Potential difference

30. What are the two generic methods to eliminate static electricity from metal objects?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Opposition to electrical current
50 Ohms
Bonding and grounding

31. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Stores electrical charge
Energy
Electromagnetism
50 Ohms

32. What is insulation resistance?
Gauge number
Unlike poles attract
Electrical resistance against the flow of current
Potential difference

33. What does Ohm's Law represent?
Heat
Relationship between current and potential difference
10%
Unlike poles attract

34. What is a wire classification?
Two
Parallel
Cables
Bare - covered - insulated - stranded - cable(All of the above)

35. Where do the fingers point in both Left-Hand Rules?
20%
Volts
The direction of the magnetic field
Circular and square mills(Both A and B)

36. How do you read resistor color codes?
Secondary cell
Start with the band on the end and read to the center
Ability to store an electric charge
Symbol

37. What are the common units of measurement for round and square conductor cross - sections?
5%
Circular and square mills(Both A and B)
Heat
Heat and current control(both a and c)

38. Identify the blueprint symbol for resistors.
Resistance value can not be changed
Cell
--^V^V^V^---
Porcelain

39. What is resistance?
Circular and square mills(Both A and B)
Porcelain
Opposition to movement of free electrons
Relationship between current and potential difference

40. When reading resistance color codes - what does the fourth band indicate?
Tolerence
Bare - covered - insulated - stranded - cable(All of the above)
Grounding wire
Area and spacing of capacitor - static current in the capacitor(both A and B)

41. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Area and spacing of capacitor - static current in the capacitor(both A and B)
20%
Fixed - Electrolytic - Variable(all of the above)

42. What is capacitance in electrical terms?
Energy
Ability to store an electric charge
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)
75 Ohms

43. What is an electromagnet?
Parallel circuit
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Breakdown voltage
A difference in potential energy

44. Which of the following is a type of resistor?
Battery
Fixed - tapped - variable(all of the above)
Cables
Plastic - Rubber - Friction(all of the above)

45. Which way is the current going in the circuit shown?(electron flow)
From the negative battery terminal to the positive terminal
Wire splices
Ability to store an electric charge
Use an effect to produce another effect

46. What does a first band of white mean?
Two
Secondary cell
First digit is 9
High resistance

47. How is capacitance determined?
Area and spacing of capacitor - static current in the capacitor(both A and B)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Choke

48. What does a moving charge produce?
Potential difference - E*I - current times current change from point to point(all of the above)
1 watt
Amperes
A magnetic field

49. What is the unit of measurement of resistance?
Ohms
Insulation resistance
Opposition to electrical current
Cell

50. 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)
Serial
Voltmeter
15 -000 ohms - 20%