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Electricity, Magnetism, Light & Sound

Grade 5 · Building confidence · 8 questions · Version PG-17CLJ7F-P1OG

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1.What affects electromagnet strength?
2.What energy change occurs in a speaker?
3.Why are parallel circuit branches useful?
4.Why does sound travel faster in solids?
5.What does a switch control?
6.What can happen when light enters water?
7.Why does a shadow form?
8.Why can you hear an echo?

Answers and teaching notes

Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.

Show answers for version 18
  1. What affects electromagnet strength?Current, coil turns, and core material
  2. What energy change occurs in a speaker?Electrical energy becomes sound
  3. Why are parallel circuit branches useful?Each branch can operate independently
  4. Why does sound travel faster in solids?Close particles transfer vibrations quickly
  5. What does a switch control?Whether a circuit is open or closed
  6. What can happen when light enters water?It refracts, or bends
  7. Why does a shadow form?An object blocks light
  8. Why can you hear an echo?Sound reflects from a surface

Worked example

Use a model to track energy, forces, and waves through a system.

Common mistake

Assuming energy travels without a path or medium.

Helpful hint

Draw the source, path, interaction, and result.