Download - Voltage – Electrical Potential
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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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• 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)
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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
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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
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Practice Problems:
1. 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
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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
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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
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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
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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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Symbol Units Unit Symbol
Formula
Current I amps A I = Q / T
Time T seconds S t = Q / I
Charge Q coulomb c Q = I x t
OR Q = E / V
Electric Potential
V volts V V = E / Q
Energy E joules J E = V x Q
OR E = P x t
Power P watts W P = E / t