電流經過電阻既問題(串聯)(並聯)

其實呢個电工問題用數學公式解答會易好多;
V- 电壓
I - 电流
R- 电阻

公式V=IR ，適用於一個簡單閉合电路
如果V不變，电阻加大，电流就減少

你所指嘅电流不變，係V同R都不變，單閉合电路
之电流係守恆(不變)。

A係电流單位，公式上係用I代表。

一個閉合电路嘅电流係守恆嘅，意思即出幾多，入番幾多。
家用嘅漏电安全制都係用呢個原理。

For the first 2 questions,
Current(電流) means the flow of charge. And its unit, A(Cs-1), Ampere means the number of charge flowing through a point within the circuit.

during discharge of cell, the number of electrons coming out of the cell is equal to the number of electrons going back to the cell, by conservation of charge.

There is no loss of charge when electrons going through the loads in the circuit.

Therefore, 電流經過電阻後, 電流既大小(A)沒有減少.


For the 3rd question,
如果電流既大小(A)沒有減少, 咁電阻是阻什麼?

When charges flows through the loads, energy is transferred to them.
There is energy loss from the charge to the load.

So, 電阻是阻charge.