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The temperature inside a refrigerator is $$t_{2}^0c$$ and the room temperature is $$t_{1}^0c$$. The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be
$$\frac{t_1+273}{t_1-t_2}$$
$$\frac{t_2+273}{t_1-t_2}$$
$$\frac{t_1+t_2}{t_1+273}$$
$$\frac{t_1}{t_1-t_2}$$
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