An electric current is the flow of charge through an electric circuit. Current is the rate of charge flow and is represented by the symbol I.
The unit that represents current is C/s which is also called an ampere. Current can be calculated by the formula I = Q/t where I is the current in amperes, Q is the charge in coulombs, and t is time in seconds.
An ammeter is a current-measuring device that must be wired so that all current can flow through it. The ammeter must be a good conductor so that no energy is lost when it's added into the circuit.
In Direct Current or DC, current flows in one direction from the power supply, through the conductor and ends at the load. In Alternating Current or AC, the electrons can reverse their direction with the help of electric and magnetic forces.
In a circuit, electric potential difference is the electrical potential energy for each coulomb of charge in a circuit. It is represented by the symbol V. Electric potential energy can be calculated by the formula
V = E/Q. E is energy and Q is the charge. Potential difference can also be called voltage.
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