if you are concerned with AMPS, then you can run a space heater on LOW, which uses LESS amps, maybe 5, but if you run it on HIGH, then it might be using 10amps. Other appliances use varying amps, depending on what they are doing - a blender might use 2amps on one low setting, but 5 on a different setting, because of the extra power needed. TVs and game consoles and device chargers aren't going to vary much, while they are in use, but they also don't use much power compared to a heater, etc.
Sometimes an electric water heater is ON, but no heating the water at the moment, so it's a 'silent' power user. The moment it's temperature sensor sees low temperature, though, it suddenly 'kicks on', and may be using up to 10amps - if you are also using other devices and appliances at the same time, the breaker could trip, even though you don't think you are doing anything differently. These 'silent' users of large power draws cause distress to a lot of newer RVrs because they didn't 'turn on' something, yet the breaker tripped.
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