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).
Let me see if I can assist you a little further by defining the terms you appear to be confusing you. ERROR-The difference between the expected value and the value as measured. Example-If the Calibrator is outputting 75.0 volts DC the multimeter should measure 75.0 volts DC. If it actually measures 75.1 Volt DC then the measurement is 0.1 volt or 75.1 - 75.0. TOLERANCE-Usually provide as a percentage of the expected value. It can be plus or minus. Tolerance = (Measured Value-Expected Value)/Expected Value.