We really feel ___ about what we can use in the future. We can’t imagine how we can go on ___ without this resources. Think about it ___. I think we should ___ no to the students who waste things every day.In our daily life, we can do things to stop waste ___ happening...
The hope for a "solar revolution" has been floating around for decades - the idea that one day we'll all use free solar electricity from thesun. This is a seductive promise, because on a bright, sunny day, the sun's rays give off approximately1,000 watts of energyper square meter...
The energy that we need to carry out our day-today activities comes from a variety of sources. However, the maximum chunk for global consumption comes from fossil fuels which include coal, natural gas and oil. They account for about 81% of the global energy we use. Other sources include h...
As we've already discussed, a generator converts mechanical energy into electricity. A motor works on the same principles, but in the opposite direction -- it converts electrical energy into mechanical energy. To do this, a motor needs a special kind of magnet known as anelectromagnet. In i...
Off-grid solar is a great way to be energy efficient, but it needs proper planning. Learn how to size your solar array with our expert tips.
However, as our ozone layer depletes due to use of chlorofluorocarbons (CFCs), UV levels are increasing. This can lead to health effects like skin cancer [source: EPA]. X-rays: X-rays are very high-energy light waves. We're most familiar with their use in a doctor's office, but X...
Like all batteries, it relies on theexchange of electronsfrom zinc and copper electrodes to produce an electrical current. The electrodes are immersed in an ion-rich electrolyte solution where electrons from zinc transfer to copper, generating the electrical charge we use to power our electrical dev...
TEMs are the most powerful electron microscopes: we can use them to see things just 1 nanometer in size, so they effectively magnify by a million times or more.How a transmission electron microscope (TEM) works A transmission electron microscope fires a beam of electrons through a specimen to...
Many electrical appliances we use every day have switches built into them. Switches can be open or closed: When the switch is open, a gap is created in the electric circuit, which breaks the flow of electric charge, and the bulb does not light up. ...
33 INT. PIZZA TIME - DAY CHUNG-SOOK So she survived an ownership change. KI-WOO (nods) It’s a made job. Of course she won’t just let go. KI-JUNG If we want to extract her, we’ll need to do some prep work. KI-WOO That’s right. We need a plan. Chung-Sook...