Macroscopic – Machine learning -- Magnet wire – Magnet – Magnetic blowout – Magnetic circuit – Magnetic constant – Magnetic core memory – Magnetic core – Magnetic field – Magnetic flux density – Magnetic flux – Magnetic moment – Magnetics – Magnetism – Magnetization – Magnetization current – Magnetostatics – Magnetostriction – Magnifying transmitter – Main distribution frame – Mainframe computer – Mains electricity – Mains hum – Mains power systems – Manitoba Hydro – Manufacturing engineering – Marginal stability – Marine energy – Marx generator – Maser – Massachusetts Institute of Technology – Mathematical model – Mathematics – Matrix (mathematics) – Maximum prospective short-circuit current – Maxwell equations – Maxwell's equations – Mead & Conway revolution – Mean free path – Measurement – Mechanical rectifier – Mechatronics – Medical equipment – Memistor – Mendocino motor – Mercury-arc rectifier – Mercury-arc valve – Mercury vapor lamp – Mesh analysis – Mesh networking – Mesh – Metadyne – Metal detector – Metal rectifier – Metalworking – Micro combined heat and power – Microcontroller – Microelectromechanical systems – Microelectronics – Microfabrication – Microgeneration – Microphone – Microprocessor – Microprocessors – Microwave oven – Microwave radio – Microwave – Millman's theorem – Mineral-insulated copper-clad cable – Mobile phone – Modbus – Model predictive control – Modem – Modulation transformer – Modulation – Monoscope – Moon landing – Moore's law – Morse code – MOSFET – Motion control – Motor (disambiguation) – Motor controller – Motor soft starter – Mp3 – MRI – Multics – Multimeter – Multisim –