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Unformatted text preview: The wires below carry currents as noted. Rate the currents I A , I B and I C : Checking Understanding Slide 2218 A. I A Ι Β Ι Χ Β. Ι Β Ι Α Ι Χ Χ. Ι Χ Ι Α Ι Β ∆. Ι Α Ι Χ Ι Β Ε. Ι Χ Ι Β Ι Α in out I I ∑ = ∑ From last lecture… The wires below carry currents as noted. Rate the currents I A , I B and I C : Answer Slide 2219 A B C B A C A C B C B A A. B. D. E. C. I I I I I I I I I I I I Χ Α Β Ι Ι Ι Units • Electric Potential (Voltage) – 1 Volt = 1 Joule/Coulomb • Electric Field – 1 Newton/Coulomb = 1 Volt/meter • Electric Current – 1 Ampere = 1 Coulomb/second • Electric Resistance – 1 Ohm = 1 Volt/Ampere Alessandro Volta AndréMarie Ampère Georg Ohm Electric Power Power, as in kinematics, is the energy transformed by a device per unit time: Electric Power The unit of power is the watt, W. For ohmic devices, we can make the substitutions: Electric Power The unit of power is the watt, W. For ohmic devices, we can make the substitutions: A resistor is connected to a 3.0 V battery; the power dissipated in the resistor is 1.0 W. The battery is traded for a 6.0 V battery. The power dissipated by the resistor is now A. 1.0 W B. 2.0 W C. 3.0 W D. 4.0 W E. 6.0 W Checking Understanding Slide 2232 Answer A resistor is connected to a 3.0 V battery; the power dissipated in the resistor is 1.0 W. The battery is traded for a 6.0 V battery....
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 Fall '11
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 Current, Energy

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