voltage and potential difference

• what is the device that is used to measure energy carried by the current on one side of the component

  voltmeter
• what is potential difference

  the difference between the voltage on each side of the component
• what is energy shifted to form

  an electrical store to a light store
• what is the difference between voltage and potential difference

  voltage used to describe the electrical energy per charge between two points, potential difference is more of the difference of two values