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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the purpose of a resistor in an LED circuit?
💡 Hint: Think about what happens if too much current flows.
Question 2
Easy
Which leg of the LED is usually longer?
💡 Hint: Remember the positive and negative sides.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the role of the resistor when connecting an LED?
- To increase voltage
- To limit current
- To change LED color
💡 Hint: Think about what could happen to the LED with too much current.
Question 2
True or False: The long leg of the LED is the negative connection.
- True
- False
💡 Hint: Remember how to identify the anode and cathode of the LED.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
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?
💡 Hint: Subtract the LED forward voltage from the supply voltage before dividing by the current.
Question 2
What will happen if you incorrectly connect the LED polarity?
💡 Hint: Think about how current flows in a LED.
Challenge and get performance evaluation