The Water Circuit Analogy

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The pressure before the water wheel is high and it sinks inside of the water wheel. According to this, the water pressure is the highest in the conductor-section from the pump onwards unto the water wheel. The water crashed with high pressure on the wheel. This makes the water wheel move. In this process, the water passes some of its energy on to the water wheel; the water's pressure sinks. The water then flows through the pipe, back to the pump. The pump anew creates a higher water pressure. If this difference in the water pressure wasn't created by the pump, the water couldn't move inside the water circuit.
Now we only have to apply this concept on an electric circuit: In the water circuit, the pump creates a difference in pressure which makes the water, and thus the water wheel, move. In an electric circuit, the voltage source creates a difference in the potential (voltage) which forces the electric current to flow. Just like the water pressure falls at the water wheel, so does the voltage at an electric element of the circuit.

In the third step we are going to think what happens if a bird sits on a voltage line. We are going to use the water circuit analogy for that, too.