What gives power to a generator?

In a portable or standby backup generator, electrical power is generated through a two-stage electromechanical process involving an internal combustion engine and an alternator. First, burning gasoline, propane, or diesel fuel inside the engine cylinders forces pistons to reciprocate, spinning the crankshaft at a high, constant RPM (typically 3,600 RPM for 60Hz power). Second, the rotating crankshaft turns the alternator's rotor inside a stationary stator of copper wire coils. According to Faraday's law of induction, this mechanical rotation of magnetic fields through copper coils induces a flow of alternating current (AC) electrical energy, which is then regulated and directed to the control panel receptacles. You can troubleshoot generator power safety safely by keeping clear of moving engine parts. You can verify that your corrective action is successful when the engine runs smoothly at proper speed and outputs a stable 120 to 240 volts AC at the outlets.