Preface; 1. Introduction; 2. Interactions, units, and magnitudes; 3. Noise in physical systems; 4. Information in physical systems; 5. Electromagnetic fields and waves; 6. Circuits, transmission lines, and wave guides; 7. Multipoles and antennas; 8. Optics; 9. Lensless imaging and inverse problems; 10. Semiconductor materials and devices; 11. Generating, modulating, and detecting light; 12. Magnetic storage; 13. Measurement and coding; 14. Transducers; 15. Timekeeping and navigation; 16. Quantum computing and communications; Appendix 1. Problem solutions.