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Basic Physics > Electricity > Flashcards

Electricity Flashcards

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1
Q

Electric current

A

Collective motion of particles carrying electric charge. This requires the relatively free motion of the charge carriers

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2
Q

Conductor

A

Material that contains charge carriers which can move freely

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3
Q

Insulator

A

No freely moving charge carriers

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4
Q

Direct current

A

Current that is constant in time

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5
Q

Alternating current

A

The current changes as a sine function over time

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6
Q

Direction of current ( conventional current direction)

A

Defined by the flow direction of the positive charges

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7
Q

Electric current

A

Amount of charge passing through a given cross section of a conductor divided by the time elapsed

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8
Q

SI unit for electric current (I)

A

Ampere

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9
Q

What does the electric current in a conductor depend on?

A

Strength of the electric field moving the charge carriers

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10
Q

Ohms law

A

The electric current in a conductor is proportional to the voltage between its two poles

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11
Q

Electric resistance is a constant, why?

A

It does not depend on voltage

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12
Q

SI unit for resistance (R)?

A

Ohm

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13
Q

In a long conductor the motion of charges will be

A

Slower and electric current lower

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14
Q

In a longer conductor the resistance is

A

Bigger

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15
Q

A big cross section area of a conductor gives … current and .. resistance.

A

Higher.. lower

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16
Q

Joule heating

A

The accelerating work of the electric field will finally increase the thermal motion of the particles. It turns into thermal energy and the conductor becomes hotter

17
Q

Kirchoffs current law

A

Junction law/first law

Currents flowing into a junction are equal to the currents flowing out of that junction.

18
Q

Kirchoffs voltage law

A

Loop law/second law

The directed sum of voltages of electrical components along a loop within an electrical circuit is zero. Voltage is partitioned between the electrical components.

19
Q

RC circuit

A

Electric circuit containing an ohmic resistor and a capacitor.

Basic Physics (7 decks)

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