Electricity

'''Electricity''' is the flow or presence of [[electric charge]]. Electricity provides the power for electric apparatus, for instance, [[television]]s, [[computer]]s, [[microwave oven]]s, and more generally anything that needs to be plugged in to work. Electric energy is electric power multiplied by the time period that the power is provided. Electric energy can be stored in [[battery|batteries]], which are used in portable devices such as [[flashlight]]s and [[walkman]]s. A battery runs out of energy after we used much power during a short period, or little power during a long period. Electricity is also the cause of [[lightning]]: electric charges going through the air cause the air to give off light flashes. Another phenomenon caused by electricity, called static electricity, is that by rubbing a balloon against a sweater electric charge is transferred to the balloon. When you hold the charged balloon close to your hair, the balloon will attract your hair by electric [[force]]s.

'''Electricity''' is the flow or presence of [[electric charge]]. Electricity provides the power for electric apparatus, for instance, [[television]]s, [[computer]]s, [[microwave oven]]s, and more generally anything that needs to be plugged in to work. Electric energy is electric power multiplied by the time period that the power is provided. Electric energy can be stored in [[battery|batteries]], which are used in portable devices such as [[flashlight]]s and [[walkman]]s. A battery runs out of energy after we used much power during a short period, or little power during a long period. Electricity is also the cause of [[lightning]]: electric charges going through the air cause the air to give off light flashes. Another phenomenon caused by electricity, called static electricity, is that by rubbing a balloon against a sweater electric charge is transferred to the balloon. When you hold the charged balloon close to your hair, the balloon will attract your hair by electric [[force]]s.

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