Transformers

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  • Created by: Jazzy15
  • Created on: 21-03-19 11:08
What are transformers used for ?
To change the size of an alternating voltage or current
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What is electricity transmitted by in the UK ?
The National Grid
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What is a transformer made of ?
Two coils of insulated wire which are wound onto an iron core
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What is the primary coil connected to ?
The electrical supply
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What is used to generate electrical energy ?
Fossil fuels or nuclear fuel
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What transformer increases the voltage ?
A step-up transformer
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For a fixed amount of electrical energy increasing the voltage means there will be a ?
decrease in current
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What does fixed mean ?
A confirmed amount
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What is electrical energy transmitted at ?
A high voltage + Low current
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Why is electrical energy transmitted at a high voltage + low current ?
To reduce energy losses as heat in the wires. Thinner wires used - reduces costs
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What do step-down transformers do ?
They decrease the voltages from the National Grid for safer use in our homes and industry
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Reducing voltage means there will be an ?
Increase in current
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Are transformers 100 percent efficient ?
Yes they are
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What is the equation for transformer efficiency ?
Vp x Ip = Vs x Is (non caps is supposed to resemble small letter)
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What is the word equation for transformer efficiency ?
potential difference across primary coil (V) x current in primary coil (A) = potential difference across secondary coil (V) x current in secondary coil (A)
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Why is electrical energy transmitted at a high voltage and low current on the National Grid ?
Amount of electrical energy spread out + wasted to surroundings as heat in National Grid is related to the size of the current, so with small current, energy transferred by heating is reduced ...
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What is the National Grids order ?
(1) power station (2) Step up transformers (3) Step-> down transformers - home and light industry
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Other cards in this set

Card 2

Front

What is electricity transmitted by in the UK ?

Back

The National Grid

Card 3

Front

What is a transformer made of ?

Back

Preview of the front of card 3

Card 4

Front

What is the primary coil connected to ?

Back

Preview of the front of card 4

Card 5

Front

What is used to generate electrical energy ?

Back

Preview of the front of card 5
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