欧姆定律：电压、电流与电阻
Ohm's Law: voltage, current, resistance
应用欧姆定律（V = IR）计算简单电路中的电流、电压或电阻，并解释电阻会阻碍电流的流动。
Apply Ohm's Law (V = IR) to calculate current, voltage, or resistance in a simple circuit, and explain that resistance opposes the flow of current
学习证据 / Evidence
- 能写出欧姆定律 V = IR，并说出每个物理量的单位。
- 能变形 V = IR，在已知其中两个量的情况下求出未知量。
- 能解释电阻阻碍电流流动，并指出影响电阻的因素（材料、长度、粗细）。
- States Ohm's Law as V = IR and identifies the units for each quantity
- Rearranges V = IR to find the unknown value given the other two
- Explains that resistance opposes current flow and identifies factors that affect resistance (material, length, thickness)
评估问题 / Assessment
如果{{name}}保持电池不变，把电路中的电阻加倍，能否预测电流会怎样变化，并用 V = IR 公式解释原因？
If {{name}} doubles the resistance in a circuit while keeping the battery the same, can they predict what happens to the current and explain using the V = IR formula?