useful

Tapping these discs and plates generates useful voltage that if amplified could be used to charge electronic devices using everyday forces.

You need to be useful to your community and not an ideology.”

“Adorable, but quite useful in a fight if needed.”

Any useful parts from Hebridean Isles will end up in a large CalMac warehouse in Gourock - an Aladdin's cave of ferry equipment that is used to keep the fleet going.

The new method could be useful for a variety of applications, he adds.