Arc welding is carried out with a current of 500 A and a voltage of 40 V.

Arc welding is carried out with a current of 500 A and a voltage of 40 V. Determine the power consumption and energy consumed in 30 minutes.

Given:

I = 500 Amperes – arc welding current;

U = 40 Volts – voltage of the welding machine;

t = 30 minutes = 1800 seconds – time span.

It is required to determine the power consumption W (Watt) and the energy Q (Joule) consumed during the time interval t.

Let’s find the power consumed by the welding machine:

W = I * U = 500 * 40 = 20,000 watts.

Then the consumed energy will be equal to:

Q = W * t = 20,000 * 1800 = 36,000,000 Joules = 36 MJ.

Answer: in 30 minutes, the welding machine consumed energy equal to 36 MJ. with a power consumption equal to 20,000 watts.