national grid Flashcards

1
Q

what is the national grid?

A

a system of transformers and high voltage transformers

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2
Q

what is the problem with getting energy to homes?

A

energy is always lost in power cable due to resistance of wires

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3
Q

what are the 2 ways we can reduce energy lost in power cables?

A

build power stations closer to homes, use transformers

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4
Q

how does using transformers reduce energy lost in power cables?

A

step-up transformers increase potential difference to 100,000s of volts, and less energy is lost in power cables when potential difference is high

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5
Q

after electricity passes through high voltage cables, what does it pass through and why?

A

step-down transformer to decrease potential difference( 230V) because potential difference is too high and unsafe for homes

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6
Q

describe briefly the journey electricity takes to get from power stations to homes?

A

power station -> step-up transformer -> high voltage cables -> step-down transformers->home

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