How to Delete iPhone Favorites. 1  Tap the Phone app on the iPhone's home screen. 2  Tap the Favorites icon at the bottom left. 3  Tap the Edit button in the top left. 4  A red icon appears next to each favorite in the list. 5  Tap the red icon for the Favorite you want to delete. Tap the Phone app on your iPhone's home screen. 2  Tap the Favorites icon at the bottom left. 3  Tap the Edit button in the top left. 4  Tap and hold on the three-line icon at the far right of the person's name.
Potential difference with respect to electric field is called as the voltage. 3. Voltage is measured in Volts (V) and unit of measuring potential difference is changed with the type of the energy field (V for electric, J/kg for gravitational etc).
The voltage between two points is equal to the work done per unit of charge against a static electric field to move the charge between two points and is measured in units of volts (a joule per coulomb).he electric field is not the only factor determining charge flow in a material, and different materials naturally develop electric potential differences at equilibrium (Galvani potentials). The electric potential of a material is not even a well defined quantity, since it varies on the subatomic scale.