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In this circuit, we have a LED, a battery, and a one-way switch in series.

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When we close the circuit, it doesn't work because there is not enough resistance, so

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we have to add here always a resistor.

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What happens now?

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If we close, the LED is not working because the intensity, if we place here an ammeter,

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we can see that it's really small, so this is not working.

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It's enough with our 220 ohms.

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So now it's lying in this position, the positive on the positive terminal of the LED.

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We are going to place it here, and now you will see that if we don't connect it correctly,

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the LED is not working.