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VOLTAGE

Electrostatics . VOLTAGE. To move a charge toward or away from another charge work is done. Work done to move a charged body. To move -q closer to +Q the electrostatic force (F e ) acts for a distance (d), Therefore W = F e d -q loses PE. +Q. -q. +q.

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VOLTAGE

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  1. Electrostatics VOLTAGE

  2. To move a charge toward or away from another charge work is done Work done to move a charged body To move -q closer to +Q the electrostatic force (Fe) acts for a distance (d), Therefore W = Fed -q loses PE +Q -q +q To move +q closer to +Q an outside force (F) must be applied to +q for a distance (d), therefore W = Fd. +q gains PE

  3. Voltage, V V = W q Units: V = W = J = Volts = V q C VOLTAGE W = work to move charge a distance, d (J) q = charge being moved (C) **Remember: C stands for coulombs

  4. Remember work causes a change in energy, therefore it can be equal to a change in PE, KE or both Voltage tells us how much change in energy occurs per unit charge Energy

  5. How much potential energy does a charge of 1.6 C gain when it moves across a voltage of 15 V? **In this case change in PE = W V = W q 15 V = W (1.6 C) W = 24 J Example

  6. What voltage exists if 8 J of work is required to move a 2 C charge across it V = W q V = 8J (2 C) V = 4 V Example

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