ch17notes - Chapter 17 Notes Energy Methods College Physics...

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Chapter 17 Notes College Physics by Giambattista et al. John B. Ross, Ph.D. IUPUI Physics Dept. Energy Methods Electric field carries energy which may be transferred into or out of a charged particle: + q F E HIGH LOW V V F E q Energy is stored whenever you do work against the field, i.e. electrical potential energy increases: Δ U E = q Δ V Electric Potential analogous to pressure changes in V cause energy transfers to occur SI unit: volt = joule/coulomb Accelerator Problems, Part II : Total mechanical energy is conserved, so Δ E = Δ K + Δ U E = 0 Δ K = –q Δ V Equipotential Surfaces surfaces of constant potential always perpendicular to field lines E always points toward surfaces at lower V Note: W = Δ K F E d = –q Δ V or d V E gradient formula SI unit for field: V/m = N/C. Capacitors popular electronic device that stores charge and energy “conductor sandwich” capacitance = measure of storage capacity, SI unit: farad (μF, nF, pF) 2 2 1 ) ( V C U V C Q E
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