Arc welding is carried out at a voltage of 50 V and a current of 100 A. Determine the power consumption and energy consumed in 40 minutes of work.
U = 50 V.
I = 100 A.
t = 40 min = 2400 s.
The power of the electric current N is determined by the formula: N = I * U, where I is the current in the conductor, U is the voltage at its ends.
N = 100 A * 50 V = 5000 W.
The energy of the current Q, which flows through the conductor, is determined by the Joule-Lenz law: Q = I * U * t, where t is the time the current passes through the conductor.
Q = 100 A * 50 V * 2400 s = 12,000,000 J.
Also, the energy of the current Q can be expressed by the formula: Q = N * t.
Answer: welding power consumption N = 5000 W, welding consumes Q = 12,000,000 J of energy.
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