The voltage on the section of the circuit is 20 V, the current is 5 A, how long will the work be done 100 J?

Initial data: U (voltage on the circuit section) = 20 V; I (current in the circuit) = 5 A; A (the work that the electric current must do) = 100 J.

The length of time during which the necessary work will be performed is determined from the formula: A = U * I * t, whence t = A / (U * I).

Let’s perform the calculation: t = 100 / (20 * 5) = 100/100 = 1 s.

Answer: Electric current will do the necessary work in 1 second.