Have you noticed how most of your summer clothes are light coloured and your winter clothes are darker? It’s not just fashion, it’s science. Colour and light play an important part in transmitting heat or thermal energy.
Most of the things we buy from the shops have had a really long journey before getting to the shelf. And each step of that journey uses energy. We can call this embedded or hidden energy.
We use energy every day but a lot of the energy we use is electricity, gas and fuel (petrol); all of which are limited sources. We need to find ways to use less energy and also use a source that isn’t limited.
Energy moves. Sometimes we want energy to move quickly, like when we use the stove to heat up our dinner. In this case, we need good conductors of heat energy. Sometimes we want energy to stay put, like when we use a heater to warm up our room. We want the heat to stay in our room, so we need insulators.
Generally, the electricity that powers all our appliances is generated from fossil fuels. And fossil fuels are fast running out. Ideally we want an energy source that is plentiful and can be replenished or renewed.
We know energy comes from different sources like coal and gas. But how do we measure each one? It helps to know how to measure energy so you can compare how much you use every day.
Once we look at or investigate our own actions, we can start to think about what we can do to improve our use of energy. How much energy does our family use? How many appliances do we have that use a lot of energy? What do we do that uses a lot of energy?
When we talk about hidden energy, we’re referring to all the energy used to get a product from the factory or farm to our shopping trolley. What are some of the hidden costs of energy and what can we do to minimise hidden energy?
We watch a lot of TV every day. In 2014, Australians watched an average of over 90 hours of television per month, or at least 2 hours every single day. With so many Australians watching TV, what is the actual cost of using this appliance?
Heat travels from the Sun to the Earth through electromagnetic waves. Because these waves are different lengths, we refer to these waves collectively as the electromagnetic spectrum.
Using our knowledge of renewable energy, let’s create a cinquain poem. A Cinquain poem has specific syllables and word count and can also be called Didactic cinquain.
Pasteurisation isn't just for milk. Pasteurisation is the process of heating a liquid or food to a high temperature to kill bacteria and make it safe to eat or drink. The sun can be used for the pasteurisation process.