Question

Which device is used to measure pd.? What is meant by saying the electric potential at point is 1volt?

Answer 1

Hint: Electromagnetic force is the force that causes an electric current to flow in an electric circuit while the potential difference (Pd) between two points in an electric current is that difference in their electrical state which tends to cause flow of electric current between them. Volt is a unit of electromotive force as well as potential difference.

Complete step-by-step solution:
The volt has the potential difference between two points of a conductor carrying a current of one ampere when the power dissipated between these points is equal to one watt.
Electric power is defined as the rate per unit time, at which electrical energy is transferred by a circuit. A random motion of electrons in a metal does not consume current unless there is a net transfer of charge with time
Voltmeter is used to measure the potential difference and voltmeter is always connected across the electric component to measure the potential difference across the component. Drop or rise in the voltage is known as potential difference.
When we say that electric potential at a point is 1volt means 1joule of work is required to move a unit positive charge from infinity to that point.

Note:Students SI unit of electric charge is coulomb and it is represented by C. SI unit of work is joule and SI unit of current is ampere (A). Voltmeter has a high resistance because of which it consumes negligible current and digital voltmeters give a numerical display of voltages by making use of analog-to- digital converter.