Define the following terms stating their SI units: Current, Voltage, Resistance, Power.

1. Define the following terms stating their SI units:

i. Current is the rate of flow of electric charge. Its SI unit is the Ampere (A).
ii. Voltage is the electric potential difference between two points, representing the work done per unit charge to move a test charge between the points. Its SI unit is the Volt (V).
iii. Resistance is the opposition to the flow of electric current in a circuit. Its SI unit is the Ohm ($\Omega$).
iv. Power is the rate at which electrical energy is transferred or converted. Its SI unit is the Watt (W).