Electricity & Magnetism - Reference Guides

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Charges interacting with each other to do work by attraction or repulsion unit: volt (v) Measure of electron flow unit: ampere (a) Found from ohm s law; r = v/i. E = vit = pt unit: joule (j), electron-volt (ev) Rate of electric energy p = vi, or p = v2/r, or p = i2r unit: watt (w) or j/s, horsepower (hp) Ability of a conductor to induce voltage in itself when the current changes. Opposition to flow of ac current due to capacitance in circuit xc = 1/(2 fc) Opposition to flow of ac current due to inductance in circuit xl = 2 fl. North america; current flow is used in europe. Energy between two point charges separated a distance, r (or d) (i) ue is electric potential energy, k is coulomb s constant e = 1 2 r (ii) q1 & q2 are point charges (iii) for like charges, ue is positive for a finite distance r.

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