Let me tell you about the flow of water. What is the function of taps? What does the thickness (cross sectional area of the pipe) do? It limits the flow of water. It is, isn’t? Similar to the previous example, resistance’s role is to limit current or charge flow.

Sometimes resistance is intentionally placed in the circuit to limit current. The same applies to taps, where resistance is intentionally kept in place to restrict the flow of water.

Every conductor has a resistance. The conductor’s resistance is dependent on.

R = Resistance of Material * Length of Conductor / Cross Sectional Area of Conductor

This means that if the conductor is thicker, it will resist more current flow. This means that more current will flow through thicker conductor wire. Similar to:

- Thicker pipes will allow for more water to flow.
- It is possible to allow more cars to pass through a wider road.

The resistance of wire is not maintained intentionally, but all conductors have some resistance. It is the material’s resistivity. Copper has a lower resistivity than Aluminium.

The conductor’s length will determine how much resistance you have to current flow.

The terms Electrical and Water flow systems can be compared as follows:

- The voltage in an electrical circuit is very similar to the pressure (height of the tank).
- Current flow is very similar to water flow.
- Resistance of wire or external resistance in flow of current is comparable to resistance provided by pipe connected in water flow.

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