Ideal gas heating

The above shows a resistor with resistance $$R$$ installed in a cylinder filled with a fixed quantity of ideal gas. We connect the resistor to a power supply with a voltage of $$V$$ to provide heating energy in the cylinder. Suppose the pressure and volume of the ideal gas before and after heating are $$(P_0, V_0)$$ and $$(P_0, 1.5V_0),$$ respectively. If the internal energy of the ideal gas before heating is $$U_0,$$ then what is the change in the amount of the internal energy $$\Delta U$$ after heating? (The cylinder is sealed completely.)

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