Write down the conditions for the existence of an electric current.

For the emergence and maintenance of electric current in any environment, it is necessary 1) the presence of free electric charges in the environment; 2) creation of an electric field in the environment.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.