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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. In most applications - what remains constant if the current remains constant and flows in one direction?
Purging
Alternating current
Electromagnetic field
Magnetic properties

2. What is the term for two or more cells attached together?
Battery
Relationship between current and potential difference
Serial
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

3. What is power?
Series circuit
Silver
The rate of doing work
10

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
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)
Opposes any change in the current flowing in a circuit
Cell
12 volts

5. What does a transformer transform?
Cables
Serial
Grounding wire
The relationship of potential difference to current

6. What is a common form used in conductors?
Silver
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Volts
Cables

7. Identify the blueprint symbol for resistors.
Potential difference - E*I - current times current change from point to point(all of the above)
Relay
Fixed - Electrolytic - Variable(all of the above)
--^V^V^V^---

8. What is insulation resistance?
How much potential difference can a material withstand before breaking down
--^V^V^V^---
Current change in a coil creates a magnetic change
Electrical resistance against the flow of current

9. What do electrical charges need to cause a fire or explosion?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Fixed - tapped - variable(all of the above)
12 volts
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

10. What is the fundamental property of insulators?
Insulation resistance and Dielectric strength(Both A and B)
Voltage
Mutual induction
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

11. What do we call the ability to do work?
Energy
Relationship between current and potential difference
Parallel
Moving vehicles

12. To what measurement do the conductor mills refer?
Chemical action
75 Ohms
The direction of the magnetic field
1/1000th of an inch

13. What is resistance in electrical terms?
Opposition to electrical current
10%
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
Energy

14. What is the unit of measurement of resistance?
Plastic - Rubber - Friction(all of the above)
Resistance value can not be changed
Cells can be connected together to make a battery
Ohms

15. What is true about a dry cell?
The direction of the magnetic field
Common - not rechargable - gradually discharges when in storage(All of the above)
Magnetic properties
5%

16. Identify the blueprint symbol for capacitors.
Parallel circuit
The relationship of potential difference to current
Symbol
Insulation resistance and Dielectric strength(Both A and B)

17. What types of protective tapes are used?
Plastic - Rubber - Friction(all of the above)
Two
--^V^V^V^---
Insulation resistance and Dielectric strength(Both A and B)

18. What is the relationship between cells and batteries?
Plastic - Rubber - Friction(all of the above)
Cells can be connected together to make a battery
Use an effect to produce another effect
Electromagnetic field

19. What is the relationship of conductor size and length to resistance?
Resistance increases as the conductor length increases
Potential difference - E*I - current times current change from point to point(all of the above)
50 Ohms
Volts

20. What is the measure of potential difference?
Common - not rechargable - gradually discharges when in storage(All of the above)
Produce heat - light - or limit current to control it(all of the above)
Volts
Fixed - Electrolytic - Variable(all of the above)

21. What is another name for an inductor?
Ability to store an electric charge
Silver
Heat
Choke

22. Which type of cell can be recharged?
Mutual induction
Symbol
Secondary cell
Circular and square mills(Both A and B)

23. What determines the resistance of a resistor?
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)
Composition of the resistor
A difference in potential energy
Resistance value can not be changed

24. What is a rigid metal conduit?
Current flows in one direction - potential differences across a load does not change(Both A and B)
High resistance
Moving vehicles
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

25. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Start with the band on the end and read to the center
Voltage
Energy
Stores electrical charge

26. What does an object have if a magnetic field acts on it?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
DC current
Magnetic properties
The direction of the magnetic field

27. What is an arrangement of materials that create a potential difference by chemistry?
Lifting devices - chucks and clutches - brakes and pulleys(all of the above)
Cell
Relay
DC flows continuously in one direction and AC potential difference and current both change direction

28. Which material has the lowest resistance at ordinary temperatures?
How much potential difference can a material withstand before breaking down
Bonding and grounding
Produce heat - light - or limit current to control it(all of the above)
Silver

29. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Ability to store an electric charge
Start with the band on the end and read to the center
Heat

30. What is a characteristic of insulators?
By their covering
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Resistance value can not be changed
Strength of the charge

31. What is a characteristic of a fixed resistor?
Resistance value can not be changed
Current flows in one direction - potential differences across a load does not change(Both A and B)
Two
Fixed - tapped - variable(all of the above)

32. What is the relationship between magnetism and electricity?
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)
Series circuit
75 Ohms
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)

33. Which way is the current going in the circuit shown?(electron flow)
Relay
Amperes
From the negative battery terminal to the positive terminal
Electromagnetic field

34. What is produced when an alternator rotates 360 electrical degrees through a magnetic field?
Strength of the charge
Electrical resistance against the flow of current
--^V^V^V^---
Alternating current

35. Where does the thumb point in both Left-Hand Rules?
Secondary cell
The direction the negative charge moves
10
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside

36. What do junction boxes protect?
Common - not rechargable - gradually discharges when in storage(All of the above)
Wire splices
Cell
1/1000th of an inch

37. What do transducers do in electrical terms?
Resistance value can not be changed
Use an effect to produce another effect
Parallel
Potential difference - E*I - current times current change from point to point(all of the above)

38. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Use an effect to produce another effect
Plastic - Rubber - Friction(all of the above)
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
50 Ohms

39. What is a wire classification?
Area and spacing of capacitor - static current in the capacitor(both A and B)
Bare - covered - insulated - stranded - cable(All of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(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)

40. When reading resistance color codes - what does the fourth band indicate?
Insulation resistance
10%
Tolerence
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

41. What is the difference between AC and DC?
First digit
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
The relationship of potential difference to current
DC flows continuously in one direction and AC potential difference and current both change direction

42. The generator is what method of creating potential energy?
Electromagnetism
10
Porcelain
Choke

43. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
Cables
20%
Heat
The direction of the magnetic field

44. What is the name for electrical resistance of insulation?
Insulation resistance
Relationship between current and potential difference
DC flows continuously in one direction and AC potential difference and current both change direction
A magnetic field

45. What makes electrons flow?
Stores electrical charge
Two
Insulation resistance
Potential difference

46. What is a switch that operates by electricity?
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
DC flows continuously in one direction and AC potential difference and current both change direction
Relationship between current and potential difference
Relay

47. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Mutual induction
American wire gauge(AWG)
The rate of doing work
12 volts

48. What is a conductor?
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Voltage
Cables
Use an effect to produce another effect

49. What must be large enough to carry the largest current likely to occur?
Relay
Grounding wire
Unlike poles attract
Parallel

50. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
10
Purging
A difference in potential energy
Parallel