Quick questions on Pull resistors and current-limiting - WJEC GCSE Electronics (3)

2short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?

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State the logic level at a switch input that uses a pull-up resistor when the switch is open. [1 mark]

What is q2?

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An LED with forward voltage

2.0\,\text{V}

runs at

20\,\text{mA}

from a

12\,\text{V}

supply. Calculate the series resistor. [2 marks]

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