- Frozen Man
- Bullet Journal
- Why It’s So Hard to Go against the Grain?
- The Physics Of Surfing
- Why Do Traffic Signs Look The Way They Do?
- Pi Number
- The Shape of Water
- The Coming Renaissance
- Where did the meteorites go?
- Why Every City Has Its Own Climate?
- Instant Noodles
- Paracelsus: Alchemy to the Aid of Medicine
- History of Coins
- Why do waterfalls retreat?
Warming the Air
The losing party was represented by another famous inventor and entrepreneur, Thomas Edison, who advocated the advantages of direct current. The century-old dispute was ﬁnally resolved by a strong argument — economics. The main disadvantage of direct current, when transmitted over long distances, can be summed up as follows: longer wires lead to greater resistance. The power produced by a generator depends on the voltage and current:
Current = Power / Voltage
Notice that at a low voltage, we get a higher current. Based on Joule’s law, the power of heating generated by a conductor is proportional to the product of its resistance and the square of the current: