p2 - electricity Flashcards by Freya Samuel | Brainscape

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

Q

earth wire characteristics

A

protects wiring

stops casing becoming live

Q

neutral wire characteristics

A

completes circuit

0V

Q

live wire characteristics

A

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

Q

moving charge transfers ______

A

energy

Q

power is

A

energy transferred per second

Q

pd is

A

energy transferred per second

Q

change in pd =….

A

energy transfer

Q

how is electricity distributed

A

national grid

Q

what is the national grid made of

A

huge network of pylons, cables and teangormers

Q

what’re smaller stations used for

A

standby for surges in demand

Q

high current results in

A

wires heating up

inefficiency