# What is the voltage in the section of the circuit on which the work of 500 J is performed when a charge of 25 C passes?

August 31, 2021 | education

| A = 500 J.

q = 25 Cl.

U -?

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.

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