Much of modern computing depends on circuits that act like tiny on/off choices. Billions of switches inside chips can store numbers, follow instructions, and create the digital world we use every day.

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Circuits often connect the physical world to electronics. A sensor circuit can turn pressure, light, motion, temperature, or sound into an electrical signal that a device can measure and respond to.

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Good circuit design is not only about making something work once. Designers think about battery life, heat, safety, cost, noise, size, and reliability so devices keep working in real conditions.

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Circuits appear in robotics, medical devices, musical gear, cars, solar panels, appliances, satellites, and hobby projects. People work with them as electrical engineers, technicians, makers, repair specialists, researchers, artists, and product designers.

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Review this chapter with practice based on your mistakes.