Current Of electricity Flashcards
Define electric current
Defined as the rate of flow of charges
What is one coulomb
Defined as the amount of electric charges that passes through a point in one second when there is constant current of one ampere
What is potential difference
Potential difference between 2 points in a circuit is defined as the amount of electrical energy per unit charge that is converted to other forms of energy when charges pass from one point to the other.
What is one volt
One bolt is the potential difference between 2 points in a circuit when one joule of electrical energy is converted to other forms of energy as one coulomb of charge passes from one point to the other
What is EMF
The electromotive force of a source is defined as the amount of electrical energy per unit charge that is converted from other forms of energy to drive charges around a complete circuit
Define resistance
The resistance of a conductor is defined as the ratio of the potential difference across it to the current flowing through it.
What is one ohm?
One ohm is the resistance of a conductor when a potential difference of one volt across it causes a current of one ampere to flow through it
What is 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 it’s temp remain constant
Define resistivity of a material
The resistivity of a material is numerically equal to the resistance between opposite faces of a cube of the material of unit length and unit cross-sectional area.
What is 1 joule
One joule is the work required to move an electric charge of one coulomb through an electrical potential difference of 1 volt
What is 1 watt
1 watt is the rate at which work is done when one ampere of current flows through an electric potential difference of one volt.
