Define following networks (i) Active (ii) Passive (iii) Unilateral (iv) Bilateral.
An element capable of giving out power or energy to some external device is called an active element. e.g. battery, generator etc. An element which is not an active element and capable of absorbing or storing power or energy is called as passive element.
Active Network: A network consisting of at least one active element (source of energy) is called active network.
Passive Network: A network consisting of only passive elements i.e. no active element, is called passive network.