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# exam6_firstpage - material From one point to another 7...

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Exam 6 Electricity SAR Physics AM Kolchin 1. Coulomb’s Law : The electric force between two charges: q 1 and q 2 is: F elec = k q 1 q 2 r 2 where: F elec = force in newtons (N) k = 9 . 0 * 10 9 N · m 2 /C 2 , a natural constant r = distance between the charges ( m ). 2. Deﬁnition of Electric Field : The E-ﬁeld caused by one source charge ( q s ) is deﬁned as: E = k q s r 2 3. A charge q in an electric ﬁeld E feels a force: F elec = q E 4. Charge on an electron: q e = - 1 . 6 * 10 - 19 C 5. Current: amount of charge per unit time passing through a point. 1

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6. Voltage (or Potential Diference) between two points: the amount oF work needed per unit charge to move charged
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Unformatted text preview: material From one point to another. 7. Ohm’s Law: Relationship between voltage, current, and resistance. V = I R or I = V/R 8. Power ( P ) is the rate at which work is done. ±or electrical power, P = V I or P = V 2 /R or P = I 2 R 9. Equivalent resistances: (a) ±or resistances hooked up in series: R eq = R 1 + R 2 + R 3 + .... (b) ±or resistances hooked in parallel: 1 R eq = 1 R 1 + 1 R 2 + 1 R 3 + .... 2...
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exam6_firstpage - material From one point to another 7...

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