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| 184_notes:charging_discharging [2021/01/25 00:22] – bartonmo | 184_notes:charging_discharging [2021/01/25 01:07] (current) – [Charging] bartonmo | ||
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| Objects become charged by either gaining extra electrons (becoming negatively charged) or by giving up electrons (becoming positively charged). There are generally two ways to create charged objects: //by conduction// | Objects become charged by either gaining extra electrons (becoming negatively charged) or by giving up electrons (becoming positively charged). There are generally two ways to create charged objects: //by conduction// | ||
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| * **Charging by conduction** means charging by contact. For example if you have one piece of tape on top of another then rip them apart, electrons or negative ions from one piece of tape are transferred to the other, making one tape negatively charged and leaving the other positively charged. This happens by breaking the polymers that make up the tape adhesive. Which materials will take electrons and which materials will give up electrons is highly dependent on the chemical composition of the materials and which material it is paired with (the specific adhesive used in the tape, in this case). In a well known case, a plastic rod will gain electrons (become negatively charged) when rubbed with wool, but the same plastic rod will lose electrons (become positively charged) when rubbed with silk. When charging by conduction, rubbing is not necessary for charges to transfer - only contact is needed, but rubbing increases the time and parts of the surfaces that are in contact, which helps facilitate this transfer. | * **Charging by conduction** means charging by contact. For example if you have one piece of tape on top of another then rip them apart, electrons or negative ions from one piece of tape are transferred to the other, making one tape negatively charged and leaving the other positively charged. This happens by breaking the polymers that make up the tape adhesive. Which materials will take electrons and which materials will give up electrons is highly dependent on the chemical composition of the materials and which material it is paired with (the specific adhesive used in the tape, in this case). In a well known case, a plastic rod will gain electrons (become negatively charged) when rubbed with wool, but the same plastic rod will lose electrons (become positively charged) when rubbed with silk. When charging by conduction, rubbing is not necessary for charges to transfer - only contact is needed, but rubbing increases the time and parts of the surfaces that are in contact, which helps facilitate this transfer. | ||