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Fala Rafael,
1 – 2,2kWh = 2200Wh / 110V = 20A, pois Watt = Amper * Volts
2 – Eu faria 2 calculos: Corrente que passa pelo resistor 110/220 = 0,5A. Agora fazer o cálculo da potência dissipada eu faria 0,5 / 10 = 0,05 J. Acho que é isso.
abraços