Energy Transfer Electrical Vs.Mechanical

convert electrical energy into mechanical energy.
This mini battery-powered winch demonstrates the relationship between gravitational potential energy and electrical energy. By measuring the current and power source potential and lifting known masses through a measured distance, you can calculate the mechanical work done and the efficiency of the system. Includes: motor on plastic base; nylon thread; hook up wires; metal washer set (15); paper clip hanger; instructions. Use with or without ring stand. You need: ammeter, stopwatch, and AA battery.