No, it is not possible to charge a room or any object solely using electromagnetic waves in the typical sense. Electromagnetic waves can carry energy, but they do not directly induce a charge on objects or cause them to accumulate electrical energy.
However, electromagnetic waves can be used for wireless power transfer or charging in specific systems. For example, devices like smartphones or electric toothbrushes can be charged wirelessly using electromagnetic induction or resonant coupling. In these cases, a charging pad or station generates an alternating electromagnetic field, and the receiving device is designed to pick up this field and convert it into electrical energy to charge its battery.
However, these wireless charging systems require specific infrastructure and compatible devices. Charging a room as a whole or all the objects within it using electromagnetic waves alone is not a practical or efficient method of charging at this time.