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Generators and Tranformers by: Nadya Goncharenko…
Generators and Tranformers by: Nadya Goncharenko
AC and DC Generators
AC
The voltage in AC circuits also periodically reverses because the current changes direction.
Electric charge in alternating current (AC), on the other hand, changes direction periodically.
Homes typically use AC generators to power small motors and common electrical appliances.
Vacuum cleaners
Food mmixers
Juicers
Electrical fixtures
DC
In direct current (DC), the electric charge (current) only flows in one direction.
A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction.
The process is known as rectification, since it "straightens" the direction of current.
DC generators power very large electric motors
Subway systems
Banks of batteries used for mobile and off-grid uses.
DC generators provide a reliable and efficient energy supply t
Currently, the overwhelming majority of generators are the AC type, because the DC units have brushes that require periodic replacement
Transformers
Transformers and the factors that can affect the output voltage and current produced.
A transformer is a device that changes (transforms) and alternating potential difference (voltage) from one value to another value be it smaller or greater using the principle of electromagnetic induction
A device used to transfer electric energy from one circuit to another, especially a pair of multiply wound, inductively coupled wire coils that effect such a transfer with a change in voltage, current, phase, or other electric characteristic.
Step-up transformers at power stations produce the very high voltages needed to transmit electricity through the National Grid power lines
This is because high voltages improve efficiency by reducing heat loss in the power lines.
Works Cited
http://www.bbc.co.uk/schools/gcsebitesize/science/edexcel/generation_transmission_electricity/transmitting_electricityrev1.shtml
http://www.bbc.co.uk/schools/gcsebitesize/science/edexcel/generation_transmission_electricity/transmitting_electricityrev1.shtml
Textbook
