In a beeper, electrical energy is transformed into sound energy. In a light bulb, electrical energy is transformed into useful light energy (and some non-useful thermal energy). A light bulb, beeper and motor are generally referred to as a load. When a circuit is equipped with a light bulb, beeper, or motor, the electrical energy supplied to the charge by the battery is transformed into other forms in the electrical device. Such a circuit would heat the wires to a high temperature and drain the battery of its energy rather quickly. With charge flowing rapidly between terminals, the rate at which energy would be consumed would be high. Such a circuit is referred to as a short circuit. To equip a circuit with a battery and a wire leading from positive to negative terminal without an electrical device (light bulb, beeper, motor, etc.) would lead to a high rate of charge flow. The mere movement of charge from terminal to terminal is of little use if the electrical energy possessed by the charge is not transformed into another useful form. Electric circuits are designed to serve a useful function.
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