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Question 9

An LED indicator circuit is connected to the output of a logic gate. The potential difference across the blue LED is 3.2 V when it is lit. The current through the LED must not exceed 16 mA. All logic gate outputs are: logic low = 0 V, logic high = 12.0 V. A student suggests using a resistor of nominal resistance 560 Ω with a tolerance of ±5% \pm 5\%\,±5% in series with the LED. Deduce whether the student's suggestion is suitable.

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Current electricity Questions

  1. A Level
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  3. /Current electricity