Electro-Static Revision Notes
- Electric Current is a flow of electric charges, consisting of electrons. Two types of charges – positive and negative. No charge matter is neutral. Forces between charges are called electrostatic forces. – Like charges repel, unlike attract.
- Rule – charge must always be conserved, it cannot be created or destroyed.
- Current measured with an ammeter, voltage measured with a voltmeter.
- Current (I) = Charge (Q) / Time (t)
- Coulomb (C) is amount of charge passing a point when a current of an ampere flows for a second.
- Electricity is conducted only through material soluble in water when in water, aqueous solutions and in a molten state.
- Material allowing flow of charge is a conductor otherwise an insulator.
- Instrument used to show the existence of a charged object is called a gold leaf electroscope, which moves in a certain direction depending on the charge on the object once the leaf has been charged and another charged object is brought near it.