Tellegen’s theorem (as applicable to any lumped d.c. network, regardless of the elements being linear or non-linear, time-varying or time-invariant) implies that

• A. sum of the voltage drops across each network element is equal to the total voltage applied to the network
• B. sum of the powers taken by all elements, in the network, within the constraints imposed by KCL and KVL is zero
• C. sum of the currents meeting at any node is not the same as the current in that mesh
• D. it is applicable to a branch which is not coupled to other branches of the network