You can launch an Android emulator on PowerShell in Windows using the emulator command-line tool, which is part of the Android SDK.

Here's how:

1. Navigate to the Android SDK's emulator directory. This is typically located in C:\Users\[YourUserName]\AppData\Local\Android\Sdk\emulator. You can use the cd command in PowerShell to change directories. For example:

   PowerShell

   cd C:\Users\[YourUserName]\AppData\Local\Android\Sdk\emulator
   

   (Replace [YourUserName] with your actual Windows username).

2. List your available Android Virtual Devices (AVDs) to know the name of the emulator you want to launch. You can do this with the command:

   PowerShell

   .\emulator.exe -list-avds
   

3. Launch the emulator by specifying the AVD name. Use the following command, replacing [AVD_Name] with the actual name of the AVD you got from the previous step:

   PowerShell

   .\emulator.exe -avd [AVD_Name]
   

   For example, if your AVD is named Pixel_6_API_33, the command would be:

   PowerShell

   .\emulator.exe -avd Pixel_6_API_33
   

Optional: Add Emulator to PATH

To avoid navigating to the emulator directory every time, you can add it to your system's PATH environment variable.

1. Search for "environment variables" in the Windows search bar and select "Edit the system environment variables".
2. In the System Properties window, click the "Environment Variables..." button.
3. Under "System variables", find the variable named "Path" and select it. Click "Edit...".
4. Click "New" and add the path to your Android SDK's emulator directory (e.g., C:\Users\[YourUserName]\AppData\Local\Android\Sdk\emulator).
5. Click "OK" on all open windows to save the changes.
6. You might need to restart PowerShell or your computer for the changes to take effect.

Once the emulator directory is in your PATH, you can launch an emulator from any directory in PowerShell using:

emulator -avd [AVD_Name]