The voltage source supplies current to the electrical circuit. When load is connected across the voltage source, the voltage source supplies current to the load. Ideal Voltage Source An ideal voltage source is capable to maintain the constant voltage across its terminals. The voltage across the voltage source terminals remains constant and the voltage is independent of the current. The symbol of voltage source is as given below. The voltage across the terminals of an ideal voltage source remains constant and the voltage does not drop with increase in the circuit current. The voltage across an ideal voltage source with change in the circuit current is as depicted below. The voltage of an ideal voltage source remains constant if there does not happen voltage drop across the internal resistance of the voltage source. The voltage source has certain resistance which cause voltage drop across the internal resistance . An ideal voltage source must have zero internal resistance. In this condit