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Basic Electricity

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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 do electrical charges need to cause a fire or explosion?
Electromagnetic field
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Unlike poles attract
The relationship of potential difference to current

2. What is the unit of measurement of resistance?
Electrical resistance against the flow of current
Ohms
Lifting devices - chucks and clutches - brakes and pulleys(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)

3. What are the two generic methods to eliminate static electricity from metal objects?
Bonding and grounding
A difference in potential energy
15 -000 ohms - 20%
Potential difference

4. What is a conductor?
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)
A material capable of carrying an electric current Silver - Copper - and Aluminum(Both A and C)
Ability to store an electric charge
--^V^V^V^---

5. What is an electromagnet?
A coil of wire that: carries current - has a magnetic field inside - and can have a bar of steel inside
By their covering
Series circuit
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)

6. What is the unit of measurement of potential difference?
A magnetic field
Volts
Amperes
Symbol

7. What is the basic law of magnetic force?
Resistance value can not be changed
75 Ohms
Unlike poles attract
15 -000 ohms - 20%

8. What do we call the ability to do work?
Secondary cell
Electromagnetism
Potential difference
Energy

9. What is a way to classify wires and cables?
Insulation resistance
Current change in a coil creates a magnetic change
By their covering
Use an effect to produce another effect

10. What information do the Left-Hand Rules provide?
Parallel circuit
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)
Tolerence
Direction of: electric charge - magnetic field - force of the moving charge(all of the above)

11. When does a DC circuit oppose current flow?
Amperes
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Porcelain
Silver

12. What is 'difference in potential(potential difference) - per unit of charge - between two points'?
Parallel circuit
10%
Amperes
Voltage

13. What is the term for two or more cells attached together?
Battery
Unlike poles attract
Use an effect to produce another effect
Symbol

14. Identify the blueprint symbol for resistors.
--^V^V^V^---
Produce heat - light - or limit current to control it(all of the above)
Secondary cell
Volts

15. What does resistance produce?
The direction the negative charge moves
Heat
High resistance
Plastic - Rubber - Friction(all of the above)

16. What does Ohm's Law represent?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
First digit
Relationship between current and potential difference
Parallel circuit

17. What determines the resistance of a resistor?
Symbol
Magnetic properties
Cells can be connected together to make a battery
Composition of the resistor

18. What determines whether a spark can be produced?
Strength of the charge
Stranded
Heat
The direction of the magnetic field

19. What is dielectric strength?
12 volts
How much potential difference can a material withstand before breaking down
American wire gauge(AWG)
Ability to store an electric charge

20. If the fourth color band is missing - this means the measured value of the resistance is what percent of the marked value?
1/1000th of an inch
20%
Two
Breakdown voltage

21. What is the name for electrical resistance of insulation?
Secondary cell
Magnetic properties
Insulation resistance
Relationship between current and potential difference

22. A resistor is color coded brown - green - orange. What is its resistance?
Composition of the resistor
15 -000 ohms - 20%
Serial
Grounding wire

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
1 watt
12 volts
1/1000th of an inch
Start with the band on the end and read to the center

24. What type of circuit has two or more paths for current to follow?
Moving vehicles
Parallel circuit
Resistance value can not be changed
Symbol

25. Which of the following is a type of resistor?
Magnetic properties
Resistance increases as the conductor length increases
Fixed - tapped - variable(all of the above)
Cells can be connected together to make a battery

26. What makes electrons flow?
How much potential difference can a material withstand before breaking down
Potential difference
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Common - not rechargable - gradually discharges when in storage(All of the above)

27. What is insulation resistance?
Insulation resistance and Dielectric strength(Both A and B)
Secondary cell
Electrical resistance against the flow of current
Amperes

28. How many kinds of poles do magnets have?
75 Ohms
Two
Heat
Fixed - Electrolytic - Variable(all of the above)

29. The generator is what method of creating potential energy?
Battery
Composition of the resistor
Electromagnetism
Heat

30. What is a DC circuit characteristic?
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)
Area and spacing of capacitor - static current in the capacitor(both A and B)
20%
Current flows in one direction - potential differences across a load does not change(Both A and B)

31. What must be large enough to carry the largest current likely to occur?
Silver
American wire gauge(AWG)
Means to maintain a potential difference - means to generate spark - spark in a flammable atmosphere(all of the above)
Grounding wire

32. What does a moving charge produce?
1/1000th of an inch
Secondary cell
A magnetic field
By their covering

33. What wire measurement is commonly used in the U.S.?
Alternating current
Cables
12 volts
American wire gauge(AWG)

34. What is resistance in electrical terms?
Opposition to electrical current
Opposes any change in the current flowing in a circuit
Resistance value can not be changed
To prevent Physical - Chemical to wiring - to prevent damage to people and property(all of the above)

35. What is the relationship between cells and batteries?
Cells can be connected together to make a battery
Opposition to electrical current
Chemical action
Wire splices

36. Which material has the lowest resistance at ordinary temperatures?
1/1000th of an inch
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)
Silver
Does not move

37. What does a transformer transform?
The relationship of potential difference to current
Circular and square mills(Both A and B)
Moving vehicles
Electromagnetism

38. How do you read resistor color codes?
Symbol
Start with the band on the end and read to the center
Heat
75 Ohms

39. What does a first band of white mean?
Heat
Bonding and grounding
Tolerence
First digit is 9

40. What is a common measure of wire diameter?
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
Gauge number
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)
Bare - covered - insulated - stranded - cable(All of the above)

41. Which way is the current going in the circuit shown?(electron flow)
Amperes
Bonding and grounding
Choke
From the negative battery terminal to the positive terminal

42. What is an arrangement of materials that create a potential difference by chemistry?
10
Cell
Physical protection for conductors - Grounding for conductors - Concealment for conductors(all of the above)
Chemical action

43. What is a type of mechanical transducer?
Current change in a coil creates a magnetic change
First digit
Solenoid and Relay(both A and B)
Potential difference - E*I - current times current change from point to point(all of the above)

44. What is a characteristic of insulators?
Electrical resistance against the flow of current
Series circuit
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)
High dielectric and mechanical strength - tempurature and moisture resistance - flexible(All of the above)

45. Where does the thumb point in both Left-Hand Rules?
The direction the negative charge moves
By their covering
Moving vehicles
A magnetic field

46. In most applications - what remains constant if the current remains constant and flows in one direction?
Electromagnetic field
Resistance value can not be changed
DC flows continuously in one direction and AC potential difference and current both change direction
Opposition to movement of free electrons

47. What is power?
Opposition to movement of free electrons
The rate of doing work
Insulation resistance
Battery

48. What is a characteristic of a fixed resistor?
Resistance value can not be changed
When current starts and stops flowing - when an inductor is in the circuit(Both A and B)
10
Porcelain

49. How are the capacitors connected when the combined capacitance equals less than the lowest- value capacitor?
Resistance increases as the conductor length increases
Stores electrical charge
1 watt
Serial

50. What is the term for doing work at the rate of joule per second?
Mutual induction
Heat
1 watt
Porcelain

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Basic Electricity

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