Wireless ad-hoc network has limited battery power. Energy consumption control is the main issue in a ad-hoc network. Node battery power is a precious resource that should be used in order to avoid the early termination of nodes. Node power consumption is reduced by vary transition time. Power control with transition time is proposed to control power consumption in mobile ad-hoc network. Simulation model has been used to analysis the energy consumption of a node. This has been achieved by estimating the time spent in each activity by a node.