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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 a switch that operates by electricity?
15 -000 ohms - 20%
Relay
Moving vehicles
Parallel

2. Which type of cell can be recharged?
Secondary cell
Voltmeter
Voltage
Mutual induction

3. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
The relationship of potential difference to current
Voltage
The direction of the magnetic field
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

4. The thermocouple uses which method for creating potential energy?
High resistance
By their covering
Heat
Gauge number

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

6. What are the common units of measurement for round and square conductor cross - sections?
Use an effect to produce another effect
Circular and square mills(Both A and B)
Grounding wire
A difference in potential energy

7. When reading resistance color codes - what does the first band indicate?
Heat
Wire splices
Current change in a coil creates a magnetic change
First digit

8. 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)
Wire splices
Common - not rechargable - gradually discharges when in storage(All of the above)
Purging

9. Identify the blueprint symbol for capacitors.
Opposes any change in the current flowing in a circuit
Symbol
Stranded
Resistance increases as the conductor length increases

10. What does static electricity do?
A magnetic field
Does not move
Parallel circuit
Two

11. What is the basic law of magnetic force?
Does not move
Opposes any change in the current flowing in a circuit
By their covering
Unlike poles attract

12. How are the capacitors connected when the combined capacitance equals a sum of all the capacitors?
Parallel
First digit is 9
Heat and current control(both a and c)
From the negative battery terminal to the positive terminal

13. What do we call the ability to do work?
1 watt
10%
Energy
Opposes any change in the current flowing in a circuit

14. What is a way to classify wires and cables?
By their covering
Secondary cell
Grounding wire
Opposition to movement of free electrons

15. What is the unit of measurement of electrical current?
Symbol
The rate of doing work
Does not move
Amperes

16. What instrument measures voltage?
Voltmeter
Parallel circuit
Wire splices
Plastic - Rubber - Friction(all of the above)

17. What is the relationship of conductor size and length to resistance?
Start with the band on the end and read to the center
By their covering
Volts
Resistance increases as the conductor length increases

18. What is capacitance in electrical terms?
A magnetic field
Ability to store an electric charge
Common - not rechargable - gradually discharges when in storage(All of the above)
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

19. What is a common measure of wire diameter?
Grounding wire
Gauge number
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Potential difference

20. What is needed for electric heating elements and the filaments of light bulbs?
Symbol
High resistance
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
DC current

21. If the fourth color band is gold - this means the measured value of the resistance is what percent of the marked value?
5%
Does not move
How much potential difference can a material withstand before breaking down
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)

22. What is induction?
Current change in a coil creates a magnetic change
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
50 Ohms
Amperes

23. 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
The rate of doing work
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
12 volts
Relay

24. What must be large enough to carry the largest current likely to occur?
20%
Opposition to movement of free electrons
Magnetic properties
Grounding wire

25. Which material has the lowest resistance at ordinary temperatures?
Series circuit
Silver
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Current flows in one direction - potential differences across a load does not change(Both A and B)

26. What does a third band of brown mean?
10
Energy
The rate of doing work
Breakdown voltage

27. What is the relationship between cells and batteries?
Heat
Opposition to movement of free electrons
1/1000th of an inch
Cells can be connected together to make a battery

28. What types of protective tapes are used?
Voltmeter
Heat
Plastic - Rubber - Friction(all of the above)
Breakdown voltage

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
Bonding and grounding
Circular and square mills(Both A and B)
Symbol

30. What is the purpose of a raceway?
Battery
Opposes any change in the current flowing in a circuit
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
A magnetic field

31. What determines the resistance of a resistor?
Composition of the resistor
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
75 Ohms
Stranded

32. What is another name for an inductor?
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)
Fixed - Electrolytic - Variable(all of the above)
Current change in a coil creates a magnetic change
Choke

33. To what measurement do the conductor mills refer?
Relationship between current and potential difference
Composition of the resistor
By their covering
1/1000th of an inch

34. Where does the thumb point in both Left-Hand Rules?
The direction the negative charge moves
DC current
Cables
Chemical action

35. The dry cell is what method for creating potential energy?
Energy
Chemical action
Porcelain
Purging

36. Which of the following materials is NOT a good conductor?
Parallel
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
Porcelain
Bare - covered - insulated - stranded - cable(All of the above)

37. What is the purpose of resistors in electrical circuits?
Bonding and grounding
Produce heat - light - or limit current to control it(all of the above)
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Volts

38. In most applications - what remains constant if the current remains constant and flows in one direction?
Two
Electromagnetic field
Circular and square mills(Both A and B)
Purging

39. How do static charges distribute themselves?
Evenly over the surface of a sphere and concentrated on points of objects(both A and C)
20%
Gauge number
The rate of doing work

40. What is resistance?
Insulation resistance
Plastic - Rubber - Friction(all of the above)
Opposition to movement of free electrons
Unlike poles attract

41. What is a characteristic of insulators?
Bonding and grounding
Potential difference
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Electromagnetism

42. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
10%
1 watt
15 -000 ohms - 20%
Serial

43. What is a conductor?
Stores electrical charge
Potential difference
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Wire splices

44. 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
Unlike poles attract
Porcelain
75 Ohms
Heat

45. What does Ohm's Law represent?
Volts
Relationship between current and potential difference
Opposes any change in the current flowing in a circuit
Tolerence

46. What is a property of inductors in electrical circuits?
Opposes any change in the current flowing in a circuit
American wire gauge(AWG)
20%
Grounding wire

47. What determines whether a spark can be produced?
Amperes
Potential difference
Wire splices
Strength of the charge

48. What is the unit of measurement of resistance?
Ohms
Mutual induction
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
DC flows continuously in one direction and AC potential difference and current both change direction

49. The generator is what method of creating potential energy?
Electromagnetism
Opposes any change in the current flowing in a circuit
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Solenoid and Relay(both A and B)

50. What can permanently break down a capacitor?
Chemical action - electromagnetism - contact - heat - light - deformation(all of the above)
Tolerence
Heat and current control(both a and c)
Breakdown voltage