I'm a simple man living my every day life and have not much understanding of math or science.
Today I read an article where someone claimed they can charge a battery $200\%$ faster. This got me thinking. What do they mean? How can something be faster than $100\%$.
Let's say I charge battery in $5$ minutes. $100\%$ faster would then be $5$ minutes faster – $0$ minutes $0$ seconds – instant charging (impossible).
This guy claims $200\%$ faster charging, so what does he mean? He charges batteries in $-5$ minutes?
Best Answer
"Faster" refers to speed (units of something per unit of time) or velocity (units of something per unit of time, with a directional component).
In this case you are talking about charging a battery in $5$ minutes. The speed of that operation is $(1.0\,\text{battery})/(5.0\,\text{minutes})$, or $0.2$ batteries per minute.
$100\%$ faster than $0.2$ batteries per minute would be $0.4$ batteries per minute, or charging a single battery in $2.5$ minutes.
$200\%$ faster than $0.2$ batteries per minute would be $0.6$ batteries per minute, or charging a single battery in $1\frac{2}{3}$ minutes, or $1$ minute and $40$ seconds.