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The first component in a circuit is an energy source. The energy source can be a battery, a fuel cell, or a solar cell. The energy source will have two terminals: a positive and a negative. The next component is the load. The load refers to the device you wish to power. This could be a light bulb, heating element, or a motor. To create a circuit, the load and the energy source must be connected by a conductive material. The conductive material allows electrons to flow out of the negative end of the energy source, through the conductive material, to the load, and back to the positive end of the energy source.