Explanation: In superposition theorem, whether we consider the effect of a voltage or current source, voltage sources are always shorted and current sources are always opened.

Why voltage source is short circuited in superposition theorem?

An ideal voltage source has zero internal impedance by definition of being “ideal”, so if we reduce its voltage to zero, we are left with a zero impedance source, which is a short circuit.

Can superposition theorem be used for voltage?

Superposition works for voltage and current but not power. ... To calculate power we first use superposition to find both current and voltage of each linear element and then calculate the sum of the multiplied voltages and currents.