Points to Remember

Electricity (Science)

Points to Remember

·                 The magnitude of current is defined as the rate of flow of charges in a conductor.

·                 The SI unit of electric current is ampere (A).

·                 The SI unit of electric potential and potential difference is volt (V).

·                 An electric circuit is a network of electrical components, which forms a continuous and closed path for an electric current to pass through it.

·                 The parameters of conductors like its length, area of cross-section and material, affect the resistance of the conductor.

·                 SI unit of electrical resistivity is ohm metre. The resistivity is a constant for a given material.

·                 The reciprocal of electrical resistivity of a material is called its electrical conductivity. σ =  1/ρ

·                 The passage of electric current through a wire results in the production of heat.

·                 This phenomenon is called heating effect of current.

·                 One horse power is equal to 746 watts.

·                 The function of a fuse wire or a MCB is to protect the house hold electrical appliances from excess current due to overloading or a short circuit.