Voltage Physics Example 2

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Example 2

medium
A 12 V12 \text{ V} battery drives a current of 2 A2 \text{ A} for 30 s30 \text{ s}. How much energy does it supply?

Solution

  1. 1
    Charge transferred: Q=It=2×30=60 CQ = It = 2 \times 30 = 60 \text{ C}.
  2. 2
    Use the energy relation for a battery: E=VQE = VQ.
  3. 3
    E=12×60=720 JE = 12 \times 60 = 720 \text{ J}

Answer

E=720 JE = 720 \text{ J}
The total energy supplied by a battery equals the voltage multiplied by the total charge transferred. This energy is converted to other forms in the circuit components.

About Voltage

The difference in electric potential energy per unit charge between two points. Measured in volts (V).

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More Voltage Examples

Example 1 easy

A battery does [formula] of work to move [formula] of charge. What is the voltage of the battery?

Example 3 easy

How much work does a [formula] battery do to push [formula] of charge through a circuit?

Example 4 medium

A [formula] battery transfers [formula] of energy to a circuit. How much charge has passed through t

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