![An electrochemical machining (ECM) is to be used to cut a through hole into a 12 mm thick aluminum plate](https://www.gkseries.com/blog/wp-content/uploads/2023/10/An-electrochemical-machining-ECM-is-to-be-used-to-cut-a-through-hole-into-a-12-mm-thick-aluminum-plate.jpg)
Q. An electrochemical machining (ECM) is to be used to cut a through hole into a 12 mm thick aluminum plate. The hole has a rectangular cross-section, 10 mm × 30 mm. The ECM operation will be accomplished in 2 minutes, with efficiency of 90%. Assuming specific removal rate for aluminum as 3.44 × 10-2 mm3/(A s), the current (in A) required is_______________(correct to two decimal places).
Ans: 968.992
Sol:
![](https://www.gkseries.com/blog/wp-content/uploads/2023/10/image-55.png)