Practice Building A Simple Circuit (4) - Electronic Fundamentals in Robotics

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8 questions

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6 sample questions

Question 1.
What is the purpose of a resistor in an LED circuit?
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Think about what happens if too much current flows.
Question 2.
Which leg of the LED is usually longer?
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Remember the positive and negative sides.
3Question 3.
What is the role of the resistor when connecting an LED?
- To increase voltage
- To limit current
- To change LED color
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Think about what could happen to the LED with too much current.
4Question 4.
True or False: The long leg of the LED is the negative connection.
- True
- False
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Remember how to identify the anode and cathode of the LED.
Question 5.
You wish to power a red LED with a forward voltage of 2V and a forward current of 20mA using a 5V source. What resistor value do you need?
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Subtract the LED forward voltage from the supply voltage before dividing by the current.
Question 6.
What will happen if you incorrectly connect the LED polarity?
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Think about how current flows in a LED.

4 more questions in this section. Enroll free to practise them all.