HSC Physics: Motors and Generators


Aaron Campbell

Reviews (2)

Reid Derrick
Travis Batch


This course is a new way of delivering content to you rather than simply talking at you. I want you to read through the material in your own time (obviously BEFORE each lesson), make notes on what you have read, find and watch videos that you can share relating to the content and come in to class with questions that you may have relating to the material. Remember this is a start point and DOES NOT replace work done in class as concepts are discussed in further detail and examples will be provided that will not be shown in this medium. 

From this I would really like you all to contribute and embrace this method, use the discussion board to ask questions or upload videos that you may feel others would benefit from watching also. I will be also contributing to these boars with HSC questions that I would like you to either contribute thoughts to or answer.The hope is that this method greatly furthers your understanding in readiness for the Higher School Certificate. An evaluation of this method will be available on completion.  

Contextual Outline:

Modern industrialised society is geared to using electricity. Electricity has characteristics that have made it uniquely appropriate for powering a highly technological society. There are many energy sources that can be readily converted into electricity. In Australia, most power plants burn a fuel, such as coal, or use the energy of falling water to generate electricity on a large scale. Electricity is also relatively easy to distribute. Electricity authorities use high-voltage transmission lines and transformers to distribute electricity to homes and industries around each state. Voltages can be as high as 5 x 105 volts from power stations but by the time this reaches homes, the electricity has been transformed to 240 volts. While it is relatively economical to generate electric power at a steady rate, there are both financial and environmental issues that should be considered when assessing the long-term impact of supplying commercial and household power. The design of a motor for an electrical appliance requires consideration of whether it will run at a set speed, how much power it must supply, whether it will be powered by AC or DC and what reliability is required. The essentials of an electric motor are the supply of electrical energy to a coil in a magnetic field causing it to rotate. The generation of electrical power requires relative motion between a magnetic field and a conductor. In a generator, mechanical energy is converted into electrical energy while the opposite occurs in an electric motor. The electricity produced by most generators is in the form of alternating current. In general AC generators, motors and other electrical equipment are simpler, cheaper and more reliable than their DC counterparts. AC electricity can be easily transformed into higher or lower voltages making it more versatile than DC electricity. This module increases students’ understanding of the applications and uses of physics and the implications of physics for society and the environment.

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