Computer-implemented method for designing an electrical network

A computer-implemented method for designing an electrical network comprising selecting by a user a number of electrical components provided by the computer, including least one generator or source component and at least one load or sink component, positioning the selected electrical components in a workspace and linking them to provide an electrical circuit. The method is characterised by the user defining a value for the output parameter for the source(s) 2 and a value for the input parameter for the load(s) 5,8, and generating by the computer a list of source and load components with the defined values. The computer iterates through the electrical circuit starting from a load component 5, wherein at each component 4,6,7, the value for the output parameter is calculated based on the values of the input parameters of the linked child components and the value for the input parameter is calculated based on the component type and the calculated value for the output parameter. The iterating step is repeated for all the load components 8 until no further values can be calculated. The parameter may be voltage rating, power rating or current rating.