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Physical Science > Chapter 9.3 > Flashcards

Chapter 9.3 Flashcards

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1
Q

What is the flow of electrons or other charged particles from one place to another?

A

Current electricity

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2
Q

What is electricity that flows only in one direction?

A

Direct current (DC)

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3
Q

What causes electrons to move from one place to another?

A

Attraction and repulsion

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4
Q

What is electricity that flows first in one direction then reverses to the opposite direction?

A

Alternating current (AC)

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5
Q

What is the work per unit charge done to move electric charges between different parts of an electric field or between differently charged regions in a conductor?

A

Voltage

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6
Q

What is the rate of charge “flow”?

A

Current

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7
Q

What is the SI unit of current?

A

Ampere

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8
Q

What is the formula for finding the power of an electric current?

A

P=Energy/time

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9
Q

How do electric companies measure and charge for electricity?

A

Kilowatt-hour

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10
Q

What are materials through which current doesn’t easily flow?

A

Insulator

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11
Q

What is a material that is neither a good conductor or insulator?

A

Semi-conductor

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12
Q

What are materials through which current flows easily?

A

Conductors

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13
Q

What is the amount a certain object hinders electron flow?

A

Resistance

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14
Q

What is the SI unit of resistance?

A

Ohm

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15
Q

What is the heat that is converted from the energy used to overcome resistance?

A

Joule heat

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16
Q

What is a material that allows current to flow through it with no resistance at all?

A

Superconductor

17
Q

What shows the mathematical relationship between voltage, current, and resistance?

A

Ohm’s law

18
Q

What is the mathematical formula for Ohm’s law?

A

Current = voltage/resistance (I=V/R)

19
Q

What is an electrical device designed to add resistance to a circuit?

A

Resistor

20
Q

How does diameter affect the resistance in an object?

A

Thicker wires have less resistance; thinner wires have more resistance

21
Q

How does length affect resistance?

A

The longer a conductor, the more the total resistance because current is hindered more along a longer path

22
Q

What is the restatement of Ohm’s law that solves for voltage?

A

V=IR

Physical Science (38 decks)

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