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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 does an object have if a magnetic field acts on it?
Magnetic properties
Breakdown voltage
Opposition to electrical current
Volts

2. Which type of cell can be recharged?
First digit is 9
Secondary cell
Circular and square mills(Both A and B)
The direction of the magnetic field

3. Identify the blueprint symbol for resistors.
Stranded
Composition of the resistor
--^V^V^V^---
Breakdown voltage

4. When reading resistance color codes - what does the fourth band indicate?
Choke
50 Ohms
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Tolerence

5. What is the term for doing work at the rate of joule per second?
Insulation resistance and Dielectric strength(Both A and B)
Stores electrical charge
1 watt
Area and spacing of capacitor - static current in the capacitor(both A and B)

6. What is a characteristic of insulators?
The direction of the magnetic field
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Relay
DC current

7. What results when current is run through a material with high resistance?
Heat and current control(both a and c)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Opposes any change in the current flowing in a circuit
Opposition to movement of free electrons

8. What is a type of capacitor?
10
Silver
Fixed - Electrolytic - Variable(all of the above)
Stranded

9. What is the purpose of resistors in electrical circuits?
Opposes any change in the current flowing in a circuit
Chemical action
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Produce heat - light - or limit current to control it(all of the above)

10. The thermocouple uses which method for creating potential energy?
The rate of doing work
Does not move
Heat
Voltage

11. What do electrical charges need to cause a fire or explosion?
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)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Bare - covered - insulated - stranded - cable(All of the above)

12. What are the names of two of the six primary methods of producing a voltage?
Fixed - tapped - variable(all of the above)
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Use an effect to produce another effect
Symbol

13. What is the relationship between magnetism and electricity?
The direction of the magnetic field
Moving vehicles
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)
10

14. What is the type of cable composed of many fine wires?
Heat
By their covering
Stranded
Produce heat - light - or limit current to control it(all of the above)

15. What is a switch that operates by electricity?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Serial
20%
Relay

16. What is a common form used in conductors?
Resistance increases as the conductor length increases
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Cables
Potential difference - E*I - current times current change from point to point(all of the above)

17. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
Tolerence
Alternating current
5%
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)

18. What is the term used when a magnetic field produced by coil 1 created a current in coil 2?
Current change in a coil creates a magnetic change
Series circuit
DC current
Mutual induction

19. What is capacitance in electrical terms?
Solenoid and Relay(both A and B)
75 Ohms
Volts
Ability to store an electric charge

20. What can permanently break down a capacitor?
Potential difference
Breakdown voltage
Use an effect to produce another effect
Insulation resistance and Dielectric strength(Both A and B)

21. What is an electromagnet?
Insulation resistance
Alternating current
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
12 volts

22. What is the unit of measurement of electrical current?
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Series circuit
Plastic - Rubber - Friction(all of the above)
Amperes

23. What is the term for two or more cells attached together?
Produce heat - light - or limit current to control it(all of the above)
15 -000 ohms - 20%
Battery
Opposes any change in the current flowing in a circuit

24. What is the purpose of a raceway?
The direction of the magnetic field
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Energy
Amperes

25. What does a moving charge produce?
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)
50 Ohms
75 Ohms
A magnetic field

26. Identify the general blueprint symbol for inductors.
15 -000 ohms - 20%
Common - not rechargable - gradually discharges when in storage(All of the above)
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Symbol

27. What does resistance produce?
Heat
A difference in potential energy
Resistance value can not be changed
First digit is 9

28. To what measurement do the conductor mills refer?
The direction the negative charge moves
Breakdown voltage
The rate of doing work
1/1000th of an inch

29. What is needed for electric heating elements and the filaments of light bulbs?
Area and spacing of capacitor - static current in the capacitor(both A and B)
High resistance
Porcelain
Heat and current control(both a and c)

30. 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
The direction of the magnetic field
Common - not rechargable - gradually discharges when in storage(All of the above)
75 Ohms
Stranded

31. What is a way to classify wires and cables?
The relationship of potential difference to current
Potential difference - E*I - current times current change from point to point(all of the above)
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)
By their covering

32. What is a common cause of static electricity in a shop?
How much potential difference can a material withstand before breaking down
Plastic - Rubber - Friction(all of the above)
Moving vehicles
Alternating current

33. What type of circuit has one path of follow through a load?
Series circuit
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
Volts
Does not move

34. When does a DC circuit oppose current flow?
Fixed - Electrolytic - Variable(all of the above)
Porcelain
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Heat

35. Solve the equation: 35 volts / 0.70 amperes= ? ohms - to find resistance.
Area and spacing of capacitor - static current in the capacitor(both A and B)
50 Ohms
Amperes
10%

36. What is the relationship of conductor size and length to resistance?
Symbol
Does not move
Relay
Resistance increases as the conductor length increases

37. What is an arrangement of materials that create a potential difference by chemistry?
Silver
Cell
Moving vehicles
1/1000th of an inch

38. What is the fundamental property of insulators?
Insulation resistance and Dielectric strength(Both A and B)
Porcelain
Relationship between current and potential difference
Relay

39. When reading resistance color codes - what does the first band indicate?
First digit
Current flows in one direction - potential differences across a load does not change(Both A and B)
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)
How much potential difference can a material withstand before breaking down

40. What are the two generic methods to eliminate static electricity from metal objects?
The direction of the magnetic field
1 watt
Bonding and grounding
--^V^V^V^---

41. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
20%
Two
The rate of doing work
Choke

42. How many kinds of poles do magnets have?
Two
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)
High resistance
Volts

43. What must be large enough to carry the largest current likely to occur?
The direction of the magnetic field
Grounding wire
50 Ohms
Insulation resistance and Dielectric strength(Both A and B)

44. What is the difference between AC and DC?
DC flows continuously in one direction and AC potential difference and current both change direction
Ohms
1/1000th of an inch
Insulation resistance

45. What is insulation resistance?
Parallel
1 watt
Electrical resistance against the flow of current
Heat

46. What makes electrons flow?
Potential difference
Current change in a coil creates a magnetic change
High resistance
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)

47. What is a property of inductors in electrical circuits?
Relay
Fixed - Electrolytic - Variable(all of the above)
Opposes any change in the current flowing in a circuit
Ohms

48. What is power?
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)
Heat
12 volts
The rate of doing work

49. What does a first band of white mean?
Potential difference - E*I - current times current change from point to point(all of the above)
By their covering
First digit is 9
5%

50. If the fourth color band is silver - this means the measured value of the resistance is what percent of the marked value?
10%
DC flows continuously in one direction and AC potential difference and current both change direction
A magnetic field
1/1000th of an inch