Ontario Grade 9 Science Class Practice Exam

Current electricity refers to the controlled flow of electrons through a conductor. This means that the rate at which electrons move through the conductor is controlled by an external source, such as a battery or power supply. Option A is incorrect because it refers to static charge, which occurs when there is a buildup of electric charge in an object. This does not involve the flow of electrons. Option B is incorrect because it refers to the natural flow of electrons in the environment, which is not controlled by an external source. Option D is incorrect because it describes an uncontrolled flow of electrons in a conductor, which can be dangerous and is not the definition of current electricity.