Calculate the Cost of Electricity Consumption (2)

The efficiency of LED lamp

Lasts approximately between 20 000 to 50 000 hour

Function of electric meter

To measure the quantity of electricity used

The purpose of the reading on the electricity meter is taken

To determine the cost of electricity consumed

Definition of elecric power, P

Is the rate of electrical energy, E, used by an electrical device. The S.I. unit for power is watt (W)

S.I unit for power

Is watt (W)

Definition of the power of 1 watt (W)

Means 1 joule of electrical energy used in 1 second (s)

Formula of electric power

Definition of electric current, I

Is defined as the rate of flow of electric charge, Q, through a conductor

S.I unit for electric current, I

Ampere (A)

S.I unit for electric charge

Coulumb (C)