Question

alternating and direct current
how does
direct current
flow in a
circuit?
it oscillates
it cannot exist in a circuit
it is static
it is constant

Explanation:

Direct current (DC) is defined as electric current that flows consistently in one single direction, maintaining a constant polarity and (in ideal steady-state conditions) a constant magnitude, unlike alternating current which oscillates direction. The other options are incorrect: oscillation describes alternating current, DC does exist in circuits (e.g., battery-powered circuits), and static refers to stationary charge, not flowing current.

Answer:

it is constant