While you are going to buy a power tool then, you will have to choose between corded and cordless. Most of the power tools are corded. Corded power tools are rated by amps. For the mid-range and budget-friendly ample grinders, 5 to 6 amps are fine. But you can also get 11 amps angle grinder in the market. If you want some larger machine then, you can also choose for 14 amps. The standard electrical outlet of this power tool can supply a maximum of 15 amps. You will have to buy an ample grinder that can work effectively and cut smoothly.