How can I power on my iPad?

Connecting your iPad to its Power Adapter should cause an iPad with a healthy battery to reboot/switch-on. If the battery is discharged, the iPad may take many minutes (or hours) to respond.

It is a common misconception that an iPad (or iPhone) can remain fully functional with damaged or defective physical buttons. Whilst Accessibility features (such as assistive touch) can be used to augment the User Interface, these features cannot be used as a substitute for physical button sequences that must be used to trigger system recovery actions. With defective physical buttons, sooner or later, you will encounter a situation from which you cannot recover.

If any of the iPad buttons are broken, you would be well advised to seek repair before you lose access to, or use of, your iPad.

iPad Service & Repair - Apple Support

Lilly2160 Said:

"How can I power on my iPad?: How can power on my iPad if the power button is broken?"

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Powering On an iPad:

Plug it into the wall, seeing if it come on --something that occurs by default. If need be, purchase a power brick: Power & Cables - Apple Support