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.

    W

P=—–

    t

W=VIt
    VIt

P=——

     t

P=VI
V=IR

P=I2R

     V

I=—–

    R

    V2

P=—–

    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

Print Friendly, PDF & Email

Leave a Reply

Your email address will not be published. Required fields are marked *