What should I do about my father who is demanding the cost of the visa and electricity from me, knowing that I cannot provide it due to my financial hardship, and would not sending the money be considered disobedience to parents?

If your father lent you the cost of the visa, he has the right to reclaim it when you are able to repay it. However, if it was a gift, he does not have the right to reclaim it unless certain conditions are met, such as the continued ownership of the gifted item by you. He also has the right to ask you for the cost of the electricity you consume in your apartment. If he asks you for your money and he is not in need of it, you are not obligated to give it to him, especially if you need it for your own expenses and those of your family. You do not sin by not giving it to him, but you must treat him kindly and with benevolence.