12v dc inverter information

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Drew asked Does a power inverter change the resistance of a circuit?

By adding volts to a circuit (going from 12v DC to 120v AC), does a power inverter alter the ohms or resistance (and therefore amps and watts) in circuit?

And got the following answer:

Power inverters use transformers, so the behaviour is similar to a transformer. Electronic switches are used to convert DC at the input to a modulated form of AC so the transformer can be used. Most modern types work at a high frequency, so the transformer can be small and light weight. They use pulse width modulation of the transformer primary supply so that a low frequency sine wave (50/60Hz) can be reconstructed by filtering at the secondary output. The input and the output are separate circuits, just like the primary and secondary of a transformer are separate circuits. The power input is always higher than the power output, because there are losses. The power in watts is Voltage * Current (simple view) . This applies to the input or the output, so the voltage is low and current high at the input, and voltage high with current low at the output, when supplying a given load. Thus 10 times the voltage, 1/10 the current (comparing output to input and ignoring losses). We are talking about current under load here, up to the rated current or power, as the current actually present depends on the load. efficiency = output_power / input_power (always less than 1). current = voltage / resistance power = voltage * current The impedance at the input of a transformer is transformed as the square of the turns ratio. For a particular 12V inverter it might be possible to get the source resistance (battery, wire and electronic switches) to 0.1 ohms. If the transformer turns ratio is 10, the source resistance (internal impedance) of the secondary is then 10 ohms, simplified view. This would be a problem, but the output voltage is regulated by the electronic controller, which is the equivalent of having a low source impedance. Nevertheless it is better to use more voltage than a 12V battery for an inverter supply, because the power level and therefore current is high for a 12V battery, and it is more expensive to keep losses low. One way to understand a power inverter is to think of it as a high power digital (PWM) amplifier with a step up transformer near the output (before the output filter). The "audio" signal is a version of the sine wave voltage required at the output.

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