There are 150 members of the House of Representatives, each one elected for a three year term. Each member represents about 150,000 people living in an electorate. The boundaries of each electorate are often changed to keep the number of people in each electorate is the same. The size of each electorate can be very different. The electorate of Kalgoorlie, in Western Australia, covers an area of 2.3 million square kilometres, while Wentworth in New South Wales is only 26 square kilometres.