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Force, Energy & Communication Lesson 10 & 11 TRANSFORMERS

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Lesson Objectives Appreciate the role of transformers Understand how to make and use a transformer To be distinguish between a step-up and step-down transformer. To understand and be able to use the transformer equation

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NO! Not one of these!

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That’s better, one of these!

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PHYSICS TEXT BOOK Turn to page 94

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PHYSICS TEXT BOOK Turn to page 94 Come round the front bench!

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Really – they are just too camp!

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Transformers The job of a transformer is to change the voltage in a circuit.

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Transformers A step down transformer REDUCES the voltage in a circuit. The input voltage is higher than the output voltage. e.g. transformers found in electrical sub- stations

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Transformers A step up transformer increases the voltage in a circuit. The input voltage is lower than the output voltage. e.g. transformers used to convert USA voltage to UK voltage

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What a transformer is made of Consists of two coils of wire wrapped around a soft iron core. The coil attached to the INPUT voltage is called the PRIMARY coil The coil attached to the OUTPUT voltage is called the SECONDARY coil.

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This is a STEP-UP transformer (more coils in the secondary than primary coil)

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Collect an experiment sheet and carry out your own investigation into transformers.

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Calculating the output voltage The output voltage can be calculated using this formula:

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Calculating the output voltage The output voltage can be calculated using this formula: secondary (output) voltage = no. of turns on secondary coil primary (input) voltage no. of turns on primary coil

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Worked example A transformer has 960 turns on the primary coil and 16 turns on the secondary coil. The primary coil is connected to 230V a.c.. What will be the output?

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Worked example A transformer has 960 turns on the primary coil and 16 turns on the secondary coil. The primary coil is connected to 230V a.c.. What will be the output? secondary voltage = 16 230 V 960

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Worked example A transformer has 960 turns on the primary coil and 16 turns on the secondary coil. The primary coil is connected to 230V a.c.. What will be the output? secondary voltage = 16 230 V 960 So the secondary voltage = 230 X (16/960) =

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Worked example A transformer has 960 turns on the primary coil and 16 turns on the secondary coil. The primary coil is connected to 230V a.c.. What will be the output? secondary voltage = 16 230 V 960 So the secondary voltage = 230 X (16/960) = 3.9 V

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Collect “The transformer – data analysis” Carry out all the exercises on this sheet.

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Collect “The transformer – data analysis” Carry out all the exercises on this sheet. HW Complete the questions on the sheet “TRANSFORMERS” – hand in on Thursday.

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Lesson Objectives Appreciate the role of transformers Understand how to make and use a transformer To be distinguish between a step-up and step-down transformer. To understand and be able to use the transformer equation

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