I have iphone se (about 6 years old). Can I use it with USB C adaptor/lightning cable?
See above question.
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See above question.
Yes. They're supposed to be compatible with anything that has a Lightning input port - all the way back to the iPhone 5. Apple's compatibility list includes the 1st generation iPhone SE
Buy USB-C to Lightning Cable (2 m) - Apple
iPhone Models
Any USB-C power adapter will have 5V available, and is supposed to default to 5V first before negotiating operation at a higher voltage if compatible. The electronics in the cable are supposed to know the requirements for the device it's dealing with, although I'm not sure how non-Apple devices with Lightning ports (like some USB power banks) are handled. As long as it's an Apple OEM or MFi cable, you should be fine.
Yes. They're supposed to be compatible with anything that has a Lightning input port - all the way back to the iPhone 5. Apple's compatibility list includes the 1st generation iPhone SE
Buy USB-C to Lightning Cable (2 m) - Apple
iPhone Models
Any USB-C power adapter will have 5V available, and is supposed to default to 5V first before negotiating operation at a higher voltage if compatible. The electronics in the cable are supposed to know the requirements for the device it's dealing with, although I'm not sure how non-Apple devices with Lightning ports (like some USB power banks) are handled. As long as it's an Apple OEM or MFi cable, you should be fine.
Yes; you can uses any iPhone that has a Lightning connection with either a Lightning to USB cable or a Lightning to USB-C cable.
I have iphone se (about 6 years old). Can I use it with USB C adaptor/lightning cable?