2_ElectricPotential_ElectricEnergy0910 - voltage and uses...

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1 Electric Potential & Electric Energy Book – Ch. 33.4 - 33.5 • 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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2_ElectricPotential_ElectricEnergy0910 - voltage and uses...

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