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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. Which way is the current going in the circuit shown?(electron flow)
Volts
From the negative battery terminal to the positive terminal
Heat
Gauge number

2. What is the basic law of magnetic force?
Solenoid and Relay(both A and B)
Unlike poles attract
Secondary cell
Voltage

3. What does a moving charge produce?
Use an effect to produce another effect
Electromagnetic field
Start with the band on the end and read to the center
A magnetic field

4. 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
High resistance
Potential difference
12 volts
The relationship of potential difference to current

5. Where does the thumb point in both Left-Hand Rules?
The direction the negative charge moves
Porcelain
Parallel
Stranded

6. What is the difference between AC and DC?
By their covering
Insulation resistance and Dielectric strength(Both A and B)
Series circuit
DC flows continuously in one direction and AC potential difference and current both change direction

7. What is a conductor?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Common - not rechargable - gradually discharges when in storage(All of the above)
Alternating current
Amperes

8. What is a common measure of wire diameter?
Choke
Battery
Secondary cell
Gauge number

9. What is a switch that operates by electricity?
Relay
Two
Electromagnetic field
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

10. How is capacitance determined?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Opposes any change in the current flowing in a circuit
Insulation resistance and Dielectric strength(Both A and B)
Potential difference

11. In most applications - what remains constant if the current remains constant and flows in one direction?
Voltmeter
A magnetic field
Electromagnetic field
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

12. What is resistance in electrical terms?
50 Ohms
Electromagnetism
Opposition to electrical current
Ability to store an electric charge

13. What is the name for electrical resistance of insulation?
Insulation resistance
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
From the negative battery terminal to the positive terminal
Area and spacing of capacitor - static current in the capacitor(both A and B)

14. What must be large enough to carry the largest current likely to occur?
Stranded
Volts
Grounding wire
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)

15. What is a property of inductors in electrical circuits?
Chemical action
Current flows in one direction - potential differences across a load does not change(Both A and B)
Opposes any change in the current flowing in a circuit
A difference in potential energy

16. What wire measurement is commonly used in the U.S.?
Insulation resistance and Dielectric strength(Both A and B)
American wire gauge(AWG)
Chemical action
Strength of the charge

17. What are the names of two of the six primary methods of producing a voltage?
Parallel circuit
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Relationship between current and potential difference
Produce heat - light - or limit current to control it(all of the above)

18. What is the use of the electromagnet?
Insulation resistance
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
The rate of doing work
1/1000th of an inch

19. What is the type of cable composed of many fine wires?
Composition of the resistor
Stranded
Fixed - tapped - variable(all of the above)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

20. What are the common units of measurement for round and square conductor cross - sections?
Voltage
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
1/1000th of an inch
Circular and square mills(Both A and B)

21. What information do the Left-Hand Rules provide?
Unlike poles attract
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Use an effect to produce another effect
Start with the band on the end and read to the center

22. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
Relay
Stores electrical charge
Electromagnetic field

23. What makes electrons flow?
Parallel
Strength of the charge
Potential difference
Current change in a coil creates a magnetic change

24. What is an electromagnet?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Electromagnetic field
Does not move
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

25. What does an object have if a magnetic field acts on it?
Fixed - tapped - variable(all of the above)
Magnetic properties
Relay
Choke

26. What is insulation resistance?
10%
Heat and current control(both a and c)
Breakdown voltage
Electrical resistance against the flow of current

27. What is the relationship between magnetism and electricity?
Breakdown voltage
Alternating current
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)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

28. What is the unit of measurement of potential difference?
Volts
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)
Alternating current
Heat

29. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Voltmeter
Wire splices
Mutual induction
Magnetic properties

30. What does a third band of brown mean?
10
Relay
10%
Fixed - Electrolytic - Variable(all of the above)

31. What instrument measures voltage?
Voltmeter
--^V^V^V^---
Breakdown voltage
Gauge number

32. What is the unit of measurement of resistance?
Ohms
Circular and square mills(Both A and B)
A difference in potential energy
Bare - covered - insulated - stranded - cable(All of the above)

33. What is needed for electric heating elements and the filaments of light bulbs?
Cables
Volts
High resistance
Current flows in one direction - potential differences across a load does not change(Both A and B)

34. Which material has the lowest resistance at ordinary temperatures?
Opposition to electrical current
Silver
10%
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

35. What is the unit of measurement of electrical current?
75 Ohms
Amperes
--^V^V^V^---
High resistance

36. When reading resistance color codes - what does the first band indicate?
Amperes
First digit
Strength of the charge
Area and spacing of capacitor - static current in the capacitor(both A and B)

37. What is a common cause of static electricity in a shop?
Use an effect to produce another effect
The direction the negative charge moves
Moving vehicles
Ohms

38. Identify the blueprint symbol for capacitors.
Porcelain
Electrical resistance against the flow of current
Symbol
Opposes any change in the current flowing in a circuit

39. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
50 Ohms
Choke
15 -000 ohms - 20%
Stores electrical charge

40. What cannot be transformed to higher or lower potential differences?
Mutual induction
The rate of doing work
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)
DC current

41. What is true about a dry cell?
Porcelain
Common - not rechargable - gradually discharges when in storage(All of the above)
Electrical resistance against the flow of current
Mutual induction

42. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Parallel
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Opposition to movement of free electrons
Resistance increases as the conductor length increases

43. A resistor is color coded brown - green - orange. What is its resistance?
15 -000 ohms - 20%
Cables
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)
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)

44. What is the term for doing work at the rate of joule per second?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
50 Ohms
1 watt
Gauge number

45. What is a DC circuit characteristic?
Current flows in one direction - potential differences across a load does not change(Both A and B)
A difference in potential energy
Potential difference - E*I - current times current change from point to point(all of the above)
Energy

46. 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)
Grounding wire
Electromagnetic field
Electromagnetism

47. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
Gauge number
10%
Bare - covered - insulated - stranded - cable(All of the above)
Potential difference

48. Why is the transformer important to AC electricity?

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49. What does Ohm's Law represent?
Relationship between current and potential difference
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Strength of the charge
Magnetic properties

50. What does static electricity do?
Use an effect to produce another effect
By their covering
Mutual induction
Does not move