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Voltage – Electrical Potential

Voltage – Electrical Potential. Voltage – or electric potential, is the energy each electron has as it moves through a circuit. The symbol for electric potential is V and the units are volts (V).

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Voltage – Electrical Potential

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  1. Voltage – Electrical Potential Voltage – or electric potential, is the energy each electron has as it moves through a circuit. The symbol for electric potential is V and the units are volts (V).

  2. In order to measure the electric potential we need to determine how much energy (Joules) each coulomb has (6.0 x 1018 electrons). V = E electric potential = energy (joules J) Q charge (coulombs C)

  3. Example A • If a battery uses 45J of energy with a charge of 15C what is the electric potential of the battery? V = E / Q = 45J / 15C = 3 V

  4. Example B • How many joules of energy are released from a 9V battery that has a charge of 25C? E = V x Q = 9 V x 25C = 225 Joules

  5. Practice Problems: • What is the potential difference in a battery if the charge is 45 C and 155 J of energy are used? V = E / Q = 150 J / 245 C = 3.4 V

  6. 2. If a 9 V battery has a charge of 46 C how much chemical energy does the battery have? E = V x Q = 9 V x 46C = 414 Joules

  7. 3. What is the charge of a battery if it is 9 V and has 600 J or energy? Q = E / V = 600 J / 9 V = 66.6 C

  8. 4. How many joules of energy are released from a 6V battery that has a charge of 250 C? E = V x Q = 6 V x 250 C = 1500 Joules

  9. 5. If a battery uses 85 J of energy with a charge of 25C what is the electric potential of the battery? V = E / Q = 85 J / 25 C = 3.4 V

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