In many places, the correct electrician training is quite necessary if one is to obtain a license from the state. In most states, this training consists of two parts – schooling and apprenticeship. Theoretical knowledge on the electrician trade is usually garnered from electrician schools or correspondence courses. The next phase, from which aspirants gain their practical knowledge, is their apprenticeship, which may take several years. The theoretical and practical training ensure that by the time an electrician is licensed, they know exactly what they are doing when they execute a job.