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Physics > 5. Electricity - Definitions > Flashcards

5. Electricity - Definitions Flashcards

1
Q

Ammeter

A

A device that measures the current of the loop of circuit it is connected in series with. An ideal ammeter is measured with 0 resistance

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2
Q

Current

A

The rate of flow of charge in a circuit

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3
Q

Electromotive force / emf

A

The amount of energy transferred by a source, per unit charge that passes through it

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4
Q

Internal resistance

A

The resistance to the flow of charge of a source. Internal resistance results in energy being dissipated within the source

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5
Q

Light dependent resistor

A

A light sensitive semiconductor , where resistance decreases as light intensity increases

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6
Q

Ohmic conductor

A

A conductor which its current flow is directly proportional to the potential difference across it, when under constant physical conditions

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7
Q

Ohm’s law

A

The current and potential difference across an ohmic conductor kept under constant physical conditions are directly proportional and the coefficient of proportionality is resistance

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8
Q

Parallel circuits

A

components are connected across each other in different loops

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9
Q

Potential divider

A

A method of splitting a potential difference by connecting two resistors in series, The potential difference is split in the ratio of their resistances

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10
Q

Resistance

A

A measure of how difficult it is for current to flow through a material

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11
Q

Resistivity

A

A quantity that is proportional to the materials resistance and cross sectional , indirectly proportional to the length

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12
Q

Resistors in parallel

A

The total resistance is equal to the inverse of the sum of the inverses of the resistance of each resistor. The potential difference is the same. The current is shared based on the resistance of each junction.

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13
Q

Resistors in series

A

The total resistance is equal to the sum of the resistance of each resistor. The current stays the same and the potential difference is shared between them based on the ratios of their resistances

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14
Q

Series circuits

A

Components are said to be connected in series when they are connected end to end in a circuit

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15
Q

Superconductor

A

A material with a resistivity of zero when its temperature is at or bellow the materials critical temperature

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16
Q

Terminal potential difference

A

The potential difference across the terminals off the power source. It is equal to the sources emf minus any energy loss due to internal resistance

17
Q

Thermistor

A

A temperature sensitive semiconductor which resistance decreases as temperature increases

18
Q

Voltmeter

A

A device used to measure potential difference across a component. An ideal voltmeter is modelled to have infinite resistance

Physics (17 decks)

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