Electrosound national grid simulation apparatus electrosound 06 7634 electricity in our homes is 240v so why not transmit it at this voltage rather than the 11 000v to 400 000v used on overhead power lines the answer is energy loss this is much greater at low voltages hence electricity is transported around the country at very high voltages this apparatus is a scaled down version which demonstrates the principle at safe voltages electrosound national grid simulation