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EquationsSheetEXAM1 - SI U N I TS POWER ELECTRIC CHARGE...

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2 2 1 e r q q k F = 2 e o k Q q r = = F E SI UNITS POWER Watts (W) Watts = Joules / second ELECTRIC CHARGE Coulomb (C) e = 1.6 x 10 -19 C FORCE (F) Newton (N) CURRENT (I) Amperes (A) Amps = Coulomb/second RESISTANCE (R) ELECTRIC POTENTIAL Volt (V) Volts = Joules / Coulomb POTENTIAL DIFFERENCE Volt (V) Volts = Joules / Coulomb CAPACITANCE (C) Farad (F) 1 F = 1 C / V Rubbing – charging by friction (ex. balloon against hair/fur: balloon steals electrons: hair/fur has + charge: balloon has – charge) (ex. rub feet on carpet: electrons move from floor through body, causing person to have excess of charge) Direct Contact – charging by conduction Without Direct Contact – charging by induction Coulomb’s Law:   k e = 8.987 5 x 10 9 N m 2 /C 2 Shows that an electrical force: Directed along --- joining the particles; inversely proportional to the ^2 of the separation distance, r; proportional to the product of the magnitudes of the charges, | q 1 |and |q 2 |on the two particles; attractive if the charges are of opp signs and
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