Topic 2 The National Grid Flashcards

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1
Q

What is the national grid

A

A giant system of cables and transformers that cover the uk and connect power stations to consumers

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2
Q

What does the national grid transfer

A

Electrical power from power statins to suppliers

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3
Q

Step up transformer

A

More turns in secondary coil
Pd increase
Current decrease

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4
Q

Step down transformer

A

More turns on primary coil
Increase current
Lower pd

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5
Q

When a demands increased

A

When people get up in the morning
Come home from school/work
When it gets dark or cold
For popular events

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6
Q

What do power stations do to make sure their is spare capacity to cope with high demand

A

Run well below their maximum power output

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7
Q

What else can be dome in case of high demands

A

Keep smaller power stations on standby

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8
Q

Which is cheaper to boost pd or current

A

Pd

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9
Q

What does increasing the pd and decreasing the current do

A

Reduce the amount of energy lost by heating the wire and the surroundings and makes the national grid more efficient

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10
Q

What is the best pd for efficient transmisión

A

400000

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11
Q

Why is power in primary coil = power in secondary coil

A

Transformers are nearly 100% efficient

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