金属の伝導：電子が電気的・熱的エネルギーを転送する
導入済み| English | 意味 |
|---|---|
| thermal conduction/ˈθɜːml kənˈdʌkʃn/ | 熱伝導 |
| charge carrier/tʃɑːdʒ ˈkærɪə/ | キャリア |
What would explain this observation?
- A metal can conduct without melting. Its delocalised electrons are already mobile in the solid and can transfer charge and energy through the structure.
- Start with a prediction. State the quantities or features you would compare, then decide what evidence could distinguish two explanations.
Build the model
- Metals are good electrical conductors because delocalised electrons can move through the giant structure and carry electrical charge. When a potential difference is applied, the electrons have a net drift that supports current. In a solid metal, the positive ion centres are not the mobile current carriers. Metals are also good thermal conductors because delocalised electrons transfer energy through the material.
- thermal conduction 热传导: Transfer of thermal energy through a material from hotter toward cooler regions; charge carrier 载流粒子: A mobile charged particle that contributes to an electric current.
固体銅線における電気伝導を説明するのは何か？
難易度 1/5 · 100 コイン + 今日初回完了時に小ボーナス付与
格子内を自由に動いて電荷を運ぶのは非局在電子のみである。銅イオンは固定位置を中心に振動しており、固体中の導電において融解は無関係である。
各専門用語を正確な意味と対応させよ。
難易度 2/5 · 140 コイン + 今日初回完了時に小ボーナス付与
関連する物理量やプロセスを区別するために定義を使用せよ。
Choose evidence that can test it
- Electrical conduction is transfer of charge; thermal conduction is transfer of energy from a hotter region toward a cooler region. Do not confuse electron drift with the whole wire moving or with electrons being permanently consumed. A metal can conduct thermal energy without being part of an electric circuit. The two explanations share mobile electrons but refer to different observations.
- For a supervised low-voltage electrical comparison, keep geometry and temperature controlled and measure voltage and current if interpreting quantitative data. For heat transfer use teacher-approved apparatus and handling, because hot metal may look unchanged. Analyse supplied measurements if direct heating is unsuitable. The simple carrier diagram does not show the detailed speed or microscopic energy distribution.
この場合、調査やモデルをより妥当にする2つの習慣は何か。
難易度 2/5 · 140 コイン + 今日初回完了時に小ボーナス付与
条件や仮定を明記することで他者が正確に再現でき、根拠となる証拠を記録することで結論を検証できます。相反する結果を隠すと、誤った結論を疑う証拠を失いますし、単一の測定でより広い主張を成立させることはできません。
Work from known quantities
- State the known values and their units. Choose the relation because its assumptions fit this case, then rearrange before substitution.
- Known: under a supplied constant-current model, 0.40 C passes a point in 2.0 s. Charge-transfer rate=charge/time=0.40/2.0=0.20 C/s. This is current 0.20 A. It quantifies electrical transfer only; it does not by itself give the amount of thermal energy conducted or the number of electrons in the entire wire.
A supplied record shows 0.90 C passing in 3.0 s. Calculate charge-transfer rate. Use the same sequence: known quantities → model → relation → substitution → unit and interpretation.
提供された記録によると、0.90 C の電荷が 3.0 s で通過した。電荷移動率を計算せよ。
難易度 2/5 · 140 コイン + 今日初回完了時に小ボーナス付与
結果は 0.3 C/s です。既知：0.90 C が 3.0 s で移動します。電流の式 = 電荷量 / 時間 を用います。電流 = 0.90/3.0 = 0.3 C/s、すなわち 0.3 A の電流です。電荷保存則により、電子は消費されません。
Check the conclusion and its limits
- Metals do not need mobile negative ions to conduct. Electron charge remains negative during heat transfer, and thermal energy is not itself a new particle substance added to the wire. Conductivity can change with temperature and composition, so geometry alone does not fix a universal value.
- Return to the original observation. Explain what the result supports, which conditions it assumes, and one way to test a competing explanation.
Electrons must be permanently used up for a metal to conduct current. This claim is false: Charge is conserved: electrons drift through the wire and out the other end; none are used up. A wire can carry current indefinitely without losing a single electron overall.
Metal conduction: electrons transfer charge and thermal energy: Electrical conduction is transfer of charge; thermal conduction is transfer of energy from a hotter region toward a cooler region. Do not confuse electron drift with the whole wire moving or with electrons being permanently consumed. A metal can conduct thermal energy without being part of an electric circuit. The two explanations share mobile electrons but refer to different observations.
金属が電流を導くためには、電子が永続的に消費されなければならない。
難易度 1/5 · 100 コイン + 今日初回完了時に小ボーナス付与
電荷保存則：電子は導線を通過して反対側から排出されますが、消耗することはありません。導線は全体として電子を一本も失わずに、無限期に電流を運ぶことができます。
高温側から低温側へ物質内を熱エネルギーが移動すること：専門用語を記せ。
難易度 1/5 · 100 コイン + 今日初回完了時に小ボーナス付与
熱伝導とは、高温側から低温側へ物質内を熱エネルギーが移動することを意味する。