A power station delivers 750 kW of power at 12,000 Vto a factory through wires with total resistance 3.0 O. How much less power is wasted if the electricity is delivered at50,000 V rather than 12,000 V?

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.