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2_ElectricPotential_ElectricEnergy0910 - voltage and uses...

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1 Electric Potential & Electric Energy Book – Ch. 33.4 - 33.5 Potential Energy & Work Last semester we discussed potential energy as it relates to gravity. When moving from high PE to low PE, the work is done naturally (by gravity) by the system. When moving from low to high, work has to be done on the system by some external force. To move a charge against its natural direction requires work. Electrical potential energy – PE of an object due to its position relative to an electric force. Results from the interaction of two objects’ charges. Any time a charge moves because of an electric force, work is done.
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2 Voltage = Potential Difference Potential difference - amount of work done per unit charge. Because the unit is the volt (V), potential difference is often called
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Unformatted text preview: voltage and uses the symbol (V). 1 Volt = 1 Joule / Coulomb Voltage Symbols Units V = voltage Volts (V) W = work (PE) Joules (J) q = charge Coulomb (C) q W V = Example #1 • If a conductor connected to the terminal of a battery has a potential difference (voltage) of 12 V, what is the potential energy of each coulomb of charge? Example #2 • If a charge of 2 x 10-5 C has a PE of 540 J, what is its voltage? 3 Example #3 • If a rubber balloon is charged to 5000 V, and the amount of charge on the balloon is 1 x 10-7 C, what is the potential energy of this charge? Example # 4 • A force of 0.032 N is required to move a charge of 4.2 x 10-6 C in an electric field between two points which are 0.25 m apart. • What is the potential difference (voltage) between the points?...
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