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Echo > Electricity > Flashcards

Electricity Flashcards

1
Q

What is electricity?

A

Electricity is the presence of charged particles such as electrons and protons.
Electrical energy is the movement of electrons in an electrical conductor.

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2
Q

In an electrical current, the number of electrons in motion is called what?

A

Amperage or Current

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3
Q

Amperage, or Current, is measured in what?

A

Amperess or Amps

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4
Q

What is a Direct Current circuit?

A

A current that moves in one direction only

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5
Q

What is an Alternating Current circuit?

A

A current that changes directions

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6
Q

What is Voltage?

A

Voltage is the difference in electrical potential between two points in a circuit. It’s the push or pressure behind current flow through a circuit, and is measured in (V) volts

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7
Q

What is Current?

A

Current is what flows on a wire or conductor like water flowing down a river. Current flows from negative to positive on the surface of a conductor. Current is measured in (A) amperes or amps

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8
Q

What is Resistance?

A

Resistance determines how much current will flow through a component. Resistors are used to control voltage and current levels. A very high resistance allows a small amount of current to flow. A very low resistance allows a large amount of current to flow. Resistance is measured in ohms.

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9
Q

What is Power (wattage)?

A

Power is the amount of current times the voltage level at a given point measured in wattage or watts.

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10
Q

What is OHMS Law?

A

E=IxR, or Voltage equals Current times Resistance.

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11
Q

What is JOULE’s Law?

A

P=IxE, or Power equals Current times Voltage.

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12
Q

What letter represents Voltage?

A

E - measured in volts

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13
Q

What letter represents resistance?

A

R - measured in Ohms

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14
Q

What letter represents current?

A

I - measured in amps

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15
Q

What letter represents power?

A

P - measured in watts

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16
Q

Which way does current actually flow?

A

Negative to Positive

17
Q

What is the voltage for AA, AAA, C, and D batteries?

A

1.5 Volts

18
Q

What is magnetic induction?

A

The process by which an object or material is magnetized by an external magnetic field.

19
Q

What are electromagnetic waves?

A

Electromagnetic fields plus electric fields. Created by vibrations of an electrical charge.

20
Q

What is energy?

A

The capacity to do mechanical work.

21
Q

What are forms of energy?

A

Thermal, Chemical, Radiant, Nuclear, Magnetic, Elastic, Sound, Mechanical, Luminous, Mass, and Electrical.

22
Q

What surrounds anything with an electrical charge?

A

Electric fields

23
Q

What are electromagnetic fields?

A

Radiating waves of magnetic energy in all directions.

24
Q

What are resistors?

A

They resist the flow of electricity. The electricity is dissipated in the form of heat.

25
Q

Compare fixed vs. variable resistors

A

Fixed always have the same resistance whereas variable resistors, or rheostat or potentiometer, have different resistances available

26
Q

What are capacitors?

A

Capacitors store electrical charges, like batteries, for later use

27
Q

What are diodes?

A

Diodes allow one way flow of energy, convert AC to Pulsating DC, and protects equipment from voltage surges. They regulate surges.

28
Q

What are transistors?

A

Transistors switch, amplify, or reduce voltage.

29
Q

What are transformers, or coils?

A

Transformers amplify or reduce AC

30
Q

What are some characteristics of a series circuit?

A

Loads are connected end to end. Only one path for current to flow. Current remains the same. Total resistance is the sum of individual resistances. Total voltage is the sum of individual resistance drops.

31
Q

What are some characteristics of a parallel circuit?

A

Current has two or more paths to flow. Volts remain the same. Total resistance is ALWAYS SMALLER than the smallest load resistance. Current splits between parallel loads depending upon resistance.

32
Q

In what kind of circuit does the current remain the same throughout the circuit?

A

A series circuit

33
Q

In what kind of circuit does voltage remain the same throughout the circuit?

A

A parallel circuit

34
Q

What are the three parts of a circuit?

A

Source, Path, and Load

35
Q

What does a source do in a circuit?

A

Provide power

36
Q

What is a path in a circuit?

A

A conductor by which current flows

37
Q

What is a load in a circuit?

A

Where the work is being done

Echo (5 decks)

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