If you live near a university with "on campus" accommodation, most have shipping containers in June/July each year where students are encouraged to put their used/unwanted items such as bedding, kitchen utensils, small electricals, clothes, fancy dress, even unopened "in date" foods such as tins and packets. Then the student union sort it all and have stands to sell it to the new intake of students in September during Fresher's week. Nothing to stop you taking a car load of stuff and putting it in their containers as long as it's sellable and the sort of thing that students may want.
We found that out when our son went to Uni and we helped him "empty" his flat at the end of the first year - it was amazing to see what others had put into the containers, including huge cuddly toys, hair dryers/tongues, a small fridge, a TV, bean bags, office chair, all kinds of clothes, duvets, sheets, mattress toppers, and a stack of packets of cereal/pasta, small mountain of tins of soups/beans, cleaning supplies, etc.
When he moved out of his second and third year flats, which weren't on campus, we still took a few things up to the Uni in our car to drop off, and as we have a campus a few miles from where we live, we've continued to do it ever since.
At least you know it's likely to go to a good home and the monies raised will be used for a good cause, ie student union, rather than risking it ending up in landfill. Re small electricals, the Uni have their own PAT testing facility for students taking their own electrical stuff to Uni with them (not allowed in their rooms unless PAT tested), so the donated electrical stuff gets tested by the Uni's own facility, hence why they encourage donations of electrical stuff as they have the means to check it over prior to sale.