P1.26-P1.27 Generating and Transmitting Electricity
- Created by: Natasha Granville
- Created on: 23-05-16 17:29
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- Generating and Transmitting Electricity
- Electromagnetic induction
- when a piece of wire is moved in a magnetic field
- creating an induced current
- Increasing the induced current
- more turns on the coil of wire
- iron core
- stronger magnet
- move wire faster
- changing the direction of an induced current
- change the direction of the movement of the wire
- change the direction of the movement of the magnetic field
- Increasing the induced current
- creating an induced current
- Bicycle dynamos
- a magnet spins inside a coil of wire, inducing a current, powering the bike's lights
- also used for wind up radios and torches
- DC current
- flows in one direction
- a magnet spins inside a coil of wire, inducing a current, powering the bike's lights
- electromagnets are used in generators because they are more powerful
- when a piece of wire is moved in a magnetic field
- Generators
- permanent magnets produce a magnetic field
- an iron core spins round and round inside the magnetic field, inducing a current
- current flows through spinning coil of wire around core
- current flows through spinning slip rings
- current flows through carbon brushes and the AC current can be used
- current flows through spinning slip rings
- current flows through spinning coil of wire around core
- an iron core spins round and round inside the magnetic field, inducing a current
- permanent magnets produce a magnetic field
- National Grid
- Electromagnetic induction
- Power station
- step up transformer
- transmission lines
- step down transformers
- homes, shops and offices
- factories
- to decrease voltage for safety
- step down transformers
- to increase voltage, therefore decreasing current, decreasing heat loss, improving efficiency
- transmission lines
- step up transformer
- 25 000 V
- Transformers
- two coils of wire around an iron core
- electricity is supplied to the primary coil and obtained from the secondary coil
- change the size of an alternating voltage
- step up transformers increase voltage and decrease current
- more turns of wire on secondary coil
- step down transformers decrease voltage and increase current
- more turns of wire on primary coil
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