Why do inverters sound?

Related questions

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2. Do I need an inverter for my RV?
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4. Can an inverter charge its own battery?
5. Should you leave your RV fridge on all the time?
6. Is it bad to leave your RV plugged in all the time?
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Tags

1. #pitched
2. #proper
3. #common
4. #enough
5. #results
6. #insufficient
7. #reasons
8. #inverter
9. #which
10. #noise
11. #battery
12. #whose
13. #reason
14. #voltage
15. #cable
16. #problem
17. #alarm
18. #sound