Question

1. describe the current in direct current (dc):

the electrons dont move
the electrons move back and forth
the protons move back and forth
the protons move in one direction only
the electrons move in one direction only
clear selection

1. describe an open circuit:

there is a closed path, so the electrons can flow freely.
there is a break in the circuit and the protons stop flowing.
there is a break in the circuit and the electrons stop flowing.
there is a closed path, so the protons can flow freely.
clear selection

Explanation:

Question 4

In direct current (DC), the flow of electric charge (carried by electrons in conductors) is in one constant direction. Electrons do move (so "the electrons don't move" is wrong). Alternating current (AC) has electrons moving back and forth (so "the electrons move back and forth" is for AC). Protons are not the charge carriers in typical electrical current flow in conductors (they are bound in atomic nuclei), so options about protons moving are incorrect. Thus, the correct description is that electrons move in one direction only.

An open circuit has a break in the circuit path. In a circuit, electrons are the charge carriers (protons don't flow as they are bound). In a closed circuit, there's a complete path for electrons to flow; in an open circuit, the break stops electron flow. So "there is a break in the circuit and the electrons stop flowing" is correct. Options with closed path or protons flowing are incorrect.

Answer:

the electrons move in one direction only

Question 5