Force, Energy & Communication
description
Transcript of Force, Energy & Communication
![Page 1: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/1.jpg)
Force, Energy & Communication
Lesson 10 & 11
TRANSFORMERS
![Page 2: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/2.jpg)
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
![Page 3: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/3.jpg)
NO! Not one of these!
![Page 4: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/4.jpg)
That’s better, one of these!
![Page 5: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/5.jpg)
PHYSICS TEXT BOOK
Turn to page 94
![Page 6: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/6.jpg)
PHYSICS TEXT BOOK
Turn to page 94
Come round the front bench!
![Page 7: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/7.jpg)
Really – they are just too camp!
![Page 8: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/8.jpg)
Transformers
The job of a transformer is to change the voltage in a circuit.
![Page 9: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/9.jpg)
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
![Page 10: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/10.jpg)
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
![Page 11: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/11.jpg)
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.
![Page 12: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/12.jpg)
This is a STEP-UP transformer (more coils in the secondary than primary coil)
![Page 13: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/13.jpg)
Collect an experiment sheet and carry out your own investigation into transformers.
![Page 14: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/14.jpg)
Calculating the output voltage The output voltage can be calculated using
this formula:
![Page 15: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/15.jpg)
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
![Page 16: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/16.jpg)
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?
![Page 17: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/17.jpg)
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
![Page 18: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/18.jpg)
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)=
![Page 19: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/19.jpg)
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
![Page 20: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/20.jpg)
Collect “The transformer – data analysis”
Carry out all the exercises on this sheet.
![Page 21: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/21.jpg)
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.
![Page 22: Force, Energy & Communication](https://reader034.fdocuments.net/reader034/viewer/2022042718/56815c9c550346895dcaa74a/html5/thumbnails/22.jpg)
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