Practice - Interfacing Electromechanical Relays
Practice Questions
Test your understanding with targeted questions
What component is used to switch a relay using a microcontroller?
💡 Hint: Think about what can amplify current.
Why do we use a diode with a relay?
💡 Hint: What happens when you suddenly cut off current from a coil?
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
What is the primary function of a freewheeling diode in a relay circuit?
💡 Hint: Consider what happens when you turn off an inductive load.
True or False: A microcontroller can directly drive an electromechanical relay without additional components.
💡 Hint: Think about the current ratings of microcontrollers vs. relays.
3 more questions available
Challenge Problems
Push your limits with advanced challenges
Design a simple circuit schematic that includes a microcontroller, transistor, relay, and diode. Describe how you would wire them to ensure safe operation.
💡 Hint: Consider the direction of current flow for each component.
If a relay operates at 12V and requires 50mA of current, what is the required resistance value for the current-limiting resistor connected to the base of the transistor to achieve this?
💡 Hint: Review how to calculate resistance based on applied voltage and desired current.
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Reference links
Supplementary resources to enhance your learning experience.