What is the main idea of the passage?

E-ink holds an image by positioning charged particles that remain stable after the electric field stops. (The passage connects electric movement with particle stability and carefully limits the low-power claim.)

Why can an unchanged page remain visible with little power?

The selected particles stay near the visible surface after being moved. (The second paragraph states that the particles largely remain in place after the field stops.)

What does “reflects” mean in the last paragraph?

sends surrounding light back toward the viewer (The passage contrasts a reflective e-ink screen with a glowing screen that produces light.)

When is display power needed?

when the page changes (The final paragraph directly says power is needed when the page changes.)

Why E-Ink Holds Still: Level 1 Reading Comprehension Questions

An electronic-paper display can keep showing a page even when it is not using power. Its screen contains tiny capsules filled with light and dark charged particles. An electric field moves selected particles toward the visible surface.

To make a dark mark, the device brings dark particles to the top in certain places. To make a light area, it moves light particles upward instead. After the field stops, the particles remain largely in position. The image therefore holds still without being redrawn many times each second.

Power is needed when the page changes, and the device still uses energy for other tasks. E-ink is not a glowing screen; it usually reflects surrounding light. Its stable particles explain both the paperlike appearance and the low energy needed to display an unmoving page.

Comprehension questions