Hi all, I'm an EE student and i have least knowledge about working of gears. I just want to know that if there are two shafts S1 and S2 of same diameter having two gears G1 and G2 mounted on them respectively. The gear ratio is 1:2. And the shaft S1 is connected to a motor which rotates at 1000rpm. Then Will the shafts S1 and S2 rotate at same rpm. If yes then why people say that gears are used to increase or decrease speeds. If no how their speeds are differed?