All electrical appliances can convert electric energy into energy

All electrical appliances can convert electric energy into energy

yes

Is the process of electric current doing work the process of transforming electric energy into heat energy?

It is the process of transforming electric energy into thermal energy or mechanical energy
Into heat: electric rice cooker, electric ferrochrome, electric iron
Conversion into mechanical energy: electric fan, motor
Generally, it is converted into two kinds of energy at the same time. For example, the electric fan is mainly converted into mechanical energy, but there is still slight heat, so there is still electric energy converted into heat energy

If an electric appliance is connected to the lighting circuit, the consumed electric energy in 5 minutes is 3.3 × 105 J, then the current passing through the electric appliance is 0______ A．

From w = uit, then I = wutt = 5min = 300s, substituting the data, I = 3.3 × 105j220v × 300s = 5a, so the answer is: 5A

If the internal energy generated by current passing through an electric appliance is 2000j and the mechanical energy is 3000j, the work done by the electric appliance is

Electric energy is converted into internal energy and mechanical energy, so the work done by the appliance is 2000 + 3000 = 5000j