Q: How can you work out which leg is the negative and which is the positive?

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when work is positive and when playing is negative

Yes Work can be positive or Negative.

On an LED, one leg will be shorter than the other. The shorter leg is the negative polarity.

what is positive and negative

Anode and cathode. Anode = negative lead, cathode = positive lead.

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the negative leg is shorter than the positive leg.

when work is positive and when playing is negative

because the negative leg is shorter.

I'm not sure what you are asking. Could you please provide more context or clarify your question?

Yes Work can be positive or Negative.

On an LED, one leg will be shorter than the other. The shorter leg is the negative polarity.

No, this will not work. Postitive to Negative/Negative to Positive will work.

what is positive and negative

Anode and cathode. Anode = negative lead, cathode = positive lead.

Current flows from the anode (positive terminal) to the cathode (negative terminal) in a LED. The longer leg of the LED indicates the positive anode side, while the shorter leg represents the negative cathode side.

Cathode (negative) is the shortest leg and there is a flat edge on the base of the LED, and it must be connected to the negative wire or "-" connection. Anode (positive) is the longest leg, and must be connected to the positive wire or "+" connection, as electricity will only pass through a LED from positive to negative.

L.E.D has one leg longer then the other one, the longer one is positive and the smaller one is negative. If you have a l.e.d which has same length of legs then look inside the l.e.d for two kind of triangle peices and one of them will be smaller which is positive and one which is bigger and is negative.