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If you work with a PC, I can recommend doing it with Irfanview.

On the other hand: JPG is used to reduce the wieght of the file and is, on the other hand, lossy. Because each and every photograph is different, they will all ask for specific settings to get an optimal balance between filesize and quality.

Should you want to do it with Photoshop, then record an action that changes one psd into a jpg and set it to some mean quality (say, 70%). Then open the batch dialog, specify your in-folder and your out-folder, and the action (if you didn't create another one it will normally be selected), and go!