Electrical Energy and Power

Question 1 Define the term electrical energy?

Question 2 Define the term electric  power?

Question 3 What is the SI unit of power?

Question 4 What is the commercial unit of KWh?

Electrical Energy

The work done by a source of electricity to maintain a current in an electrical circuit is called as electrical energy.

q= It

W= Vq

W= VIt

E= VIt

Electric Power

Electric power is defined as amount of electric energy consumed in a circuit per unit time.

P = W/t

W=VIt

P = VIt/t

P=VI

V=IR

P=I²R

I= V/R

P= V²/R

S.I. unit of power is Watt.

Electric power is said to be 1 watt if 1 ampere current flows through a circuit having 1volt potential difference
1 Horsepower =746 Watt

The department of electricity sells the electric energy to the consumers in units called kilowatt-hour(kWh)

Electricity Bill=10 units=House have consumed 10kWh electric energy.

kWh is known as Board Of Trade Unit(B.O.T)

1kWh=1000 Wh

1 kWh=1000 *60*60

= 360000