Question

An electric press consumes 120 kj of energy in 5 minutes, when the magnitude of current flowing through it is 2a. calculate the electric potential at which press operates.

Answer 1

Energy consumed = 120kJ = 120000 J
we know,
Energy consumed is given in case of electric current , E = i²Rt
Or, E = Vit [ ∵ Ohm's law , V = iR ]
Here v is electric potential ,i is current and t is time taken .

Given, E = 120000 J , i = 2A , t = 5 min = 300 sec
Now, 120000 = V × 2 × 300
⇒ 120000 = 600V
⇒ 200 = V
Hence, electric potential = 200V

Answer 2

Solution:-

given by:-

》Energy = 120kj = 120000j

》time = 5min = 300secound

by formula:-

》Energy = Power ×Time

》120000 =300 ×Power

》Power= 400W

by formula:-

》Power= V ×I

》400=V×2

》electric potencial (V=200V) ans

☆i hope its help☆