A = 500 J.
q = 25 Cl.
According to the Joule-Lenz law, the work of the electric current A is determined by the formula: A = I * U * t, where I is the current in the circuit, U is the voltage in the circuit section, t is the time of passage of the electric current.
According to the definition, the current strength is determined by the ratio: I = q / t, where q is the charge that passes through the cross section of the conductor, t is the transit time of the electric charge.
A = q * U * t / t = q * U.
U = A / q.
U = 500 J / 25 C = 20 V.
Answer: the voltage on the circuit section is U = 20 V.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.