Which of the following is true for LEDs used in a tester?

The shorter lead is always connected to the positive terminal of a battery.

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The longer lead is always connected to the positive terminal of a battery.

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Both the shorter as well as longer lead are connected to the positive terminal of a battery.

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Both the shorter as well as longer lead are connected to the negative terminal of a battery.

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Solution

The correct option is B The longer lead is always connected to the positive terminal of a battery.
LED glows even when a very weak current is passing through the circuit. Thus, it helps in testing flow of electricity in conductors when meager current is passing through the circuit. There are two wires called leads attached to an LED. One lead is slightly longer than the other as shown:
While connecting the LED to the circuit, the longer lead is always connected to the positive terminal of the battery and the short lead is connected to the negative terminal of the battery.

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