Electric field, DC & AC definitions Flashcards
Electric field
A region in space in which a charge placed in that region experiences an electric force
Electric field strength
The electric field strength at a point is defined as the electric force exerted per unit positive charge placed at that point
Coulomb’s law
Coulomb’s law states that the force between two point charges is proportional to the product of the charges and inversely proportional to the square of the distance between them
Electric potential energy
The electric potential energy of a charge at a point in an electric field is defined as the work done by an external force in bringing the charge from infinity to that point
Electric potential
The electric potential at a point in an electric field is defined as the work done per unit positive charge by an external force in bringing a small test charge from infinity to that point
Electric current
The rate of flow of charge
Potential difference
The potential difference between two points in a circuit is defined as the amount of energy per unit charge that is converted to other forms of energy when charge passes from one point to the other
Electromotive force
The electromotive force (emf) of a source is defined as the amount of electrical energy per unit charge that is converted from other forms of energy when charge passes through the source
Resistance
The resistance of a circuit component is defined as the ratio of the potential difference across it to the current flowing through it
Ohm’s law
Ohm’s law states that the potential difference across a conductor is proportional to the electric current passing through it, provided that its temperature remains constant
r.m.s. current/voltage
The r.m.s. value of the alternating current or voltage is that value of the direct current or voltage that would produce thermal energy at the same rate in a resistor
