188V la muc dien ap do bang don vi volt (V). Trong he thong dien, muc dien ap nay co the xuat hien o cac nguon AC hoac DC sau qua trinh bien doi. Hieu ro 188V giup ki su va nguoi dung chon thiet bi phu hop, toi uu hieu suat va dam bao an toan cho he thong.
188V co the xuat hien tu nguon AC sau bien doi sang DC, hoac tu nguon DC duoc tao ra bo chinh sua. Do luong co the do bang volt ke hoac dong ho do nang (multimeter) o che do DC hoac AC, tuy thuoc vao nguon. Nguoi dung can dam bao do phu hop voi muc dong dien va tinh chat cua he thong.
Trong cac he thong dien tu va che tao, 188V la muc dien ap lam viec cua nhieu mach cong suat tu nho den vua. He thong bao ve, ro le, cau chi va loc nhiu can duoc thiet ke de xu ly muc dien ap nay. Loi ich cua muc dien ap nay phu thuoc vao kich thuoc he thong, tuoi tho cua cac thanh phan va yeu to bao ve.