With the same voltage there will be less current with more resistance. And the links among current, voltage
and resistance can be expressed by the formula below: I=U/R.
In the following diagram, the current through R1 is: I=U/R=5V/10kΩ=0.0005A=0.5mA.
Do not connect the two poles of power supply with low resistance, which will make the current too high to
damage electronic components.
And resistor has no poles.
Breadboard
Take a short breadboard as an example to introduce its feature, as below.
The left picture shows the way of connection of pins. The right picture shows the pratical internal structure.
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