p2 - electricity Flashcards by Freya Samuel

Q

current definition

A

flow of charge

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Q

potential difference definition

A

the driving force of current

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Q

charge formula

A

Q=IT

current x time

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Q

current unit

A

amps (A)

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Q

charge unit

A

coulombs (C)

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Q

relationship between current and potential difference at a constant temp

A

directly proportional

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Q

what does the voltmeter measure

A

potential difference

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Q

what does ohmic conductor graph look like

A

straight line from left. right

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Q

what does a filament lamp graph look like

A

wave from left to right

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Q

what does a diode graph look like

A

only starts in fat right shoots up

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Q

ohmic conductors have ___ resistance

A

constant

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Q

what is a thermistor

A

temperature dependant resistor

hot = low res

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Q

what is an ldr

A

light dependant resistor

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Q

serious circuits ________ _______ ________

A

are all or nothing

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Q

how id potential difference distributed in séries

A

adds up - shared

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Q

how is current distributed in series

A

the same throughout

Q

resistance distribution in series curcuits

A

sum

Q

parallel circuits ____ _____

A

indépendance isolation

Q

how is pd distributed in parallel

A

same throughout

Q

current is _____ in parallel

A

shared

Q

ac

A

constantly changing direction

alternating pd

Q

uk mains supply freq and pd

A

230V 50Hz

Q

dc

A

direct current

same direction

Q

what are wires made of

A

core of copper

earth wire characteristics

protects wiring | stops casing becoming live

neutral wire characteristics

completes circuit | 0V

live wire characteristics

ac 230V always pd body = link to earth because of low res

moving charge transfers ______

energy

power is

energy transferred per second

pd is

energy transferred per second

change in pd =....

energy transfer

how is electricity distributed

national grid

what is the national grid made of

huge network of pylons, cables and teangormers

what’re smaller stations used for

standby for surges in demand

high current results in

wires heating up | inefficiency