- Energy cannot be created or destroyed. It can only be converted from one form to another.
- Find an elastic band, and stretch it out. The stretched rubber band has potential energy. If you let it go, it moves and has kinetic energy.
- Have you ever wondered how you might get a hot air balloon to float up and down? How would you launch it? How would you get it back to earth? The balloon rises by warming up the air inside it. It descends by letting the air inside it cool down. It all works because of heat energy.
- Electricity travels at 300,000 km/sec. If you travelled that fast, you could travel around the world eight times in the time it takes to turn on a light switch.
- The energy produced by the atom-splitting of one kilogram of uranium is equivalent to the burning of 1.3 million kilograms of coal or 1.35 million litres of oil.
- People run on energy too, and food is our fuel. The unit we use to measure expended heat energy is the calorie.
- Calorie expenditures comparison:
- Lying at ease – 1.5 cal/min
- Tennis – 7 cal/min
- Playing drums – 4–6 cal/min
- Golfing – 6 cal/min
- The most powerful power station is the Itaipu power station on the Paraná River near the Brazil/Paraguay border. Opened in 1984, the station has attained its ultimate capacity of 13,320 MW. (Ten times the size of Limestone!)
- Refrigerators with side by side doors use the most energy, while one door units without self-defrost use the least.
- In 15 minutes, the sun radiates as much energy onto our globe as humans use during an entire year. Just imagine if we could channel the sun’s energy effectively!
- The sun is a huge ball of hot gases, and the temperature at the centre of the sun is more than 20,000,000 C. Tremendous pressure causes tiny particles, the nuclei of hydrogen atoms, to smash into each other so hard that they fuse or combine. This nuclear fusion releases energy in the form of intense light and heat.
- Fireflies produce light using chemical energy from their food. The light they give off is more efficient than that of a light bulb. Fireflies lose only 1/15 of their energy to heat, whereas 95% of the energy used by an ordinary light bulb is wasted as heat energy. Some deep-sea squids and glowworms in caves also change the chemical energy from food into light.
- Have you ever bought a light stick at a fair and wondered what makes the stick glow? When you bend the stick, a seal breaks and two chemicals in the stick mix. As they mix, energy is released and this energy produces light. Zap! Chemical energy changes to light energy.
- In Sweden, heat is pumped out of the ground north of the Arctic Circle and used to heat buildings. Sweden has more than seven times as many heat pumps in operation than Canada.