Dynamos and transformers
- Created by: emews
- Created on: 15-11-17 16:49
View mindmap
- Dynamos and transformers
- A voltage is produced when a magnet moves in a coil of wire. This process is called electromagnetic induction.
- The size of the induced voltage can be increased by:
- rotating the coil or magnet faster
- using a magnet with a stronger magnetic field
- having more turns of wire in the coil
- having an iron core inside the coil
- Mains electricity is an AC supply. The voltage it supplies to our homes is about 230V
- Transformers are used to increase or decrease the voltage of alternating currents.
- A transformer consists of two coils of wire wound on a metal core.
- The size of the secondary voltage depends on the number of turns on both the primary and the secondary coils, and on the size of the AC voltage applied across the primary coil.
- A transformer is an electrical device that changes the voltage of an alternating current (AC) supply, such as the mains electrical supply.
- A transformer changes a high-voltage supply into a low-voltage one, or vice versa:
- a transformer that increases the voltage is called a step-up transformer
- a transformer that decreases the voltage is called a step-down transformer
- A transformer changes a high-voltage supply into a low-voltage one, or vice versa:
Comments
No comments have yet been made