Letís put things into perspective. Most older or smaller homes have 100-amp service.
In other words, the maximum amount of electricity coming from the utility into the house is 100 amps.
In reality, most homes never draw all 100 amps of power. They often fluctuate somewhere above 50 amps, depending on how many appliances are running.
Large emergency generators produce 30-amps worth of electricity. So, in theory, they can power up to 10 circuits in your main electrical panel.