Voltage Physics Example 4

Follow the full solution, then compare it with the other examples linked below.

Example 4

medium
A 9 V9 \text{ V} battery transfers 450 J450 \text{ J} of energy to a circuit. How much charge has passed through the battery?

Solution

  1. 1
    Voltage is energy per unit charge: V=EQV = \frac{E}{Q}, so Q=EVQ = \frac{E}{V}.
  2. 2
    Q=4509=50 CQ = \frac{450}{9} = 50 \text{ C}

Answer

Q=50 CQ = 50 \text{ C}
Voltage tells you how much energy each coulomb of charge receives (or loses). A 9 V9 \text{ V} battery gives 9 J9 \text{ J} to every coulomb that passes through it.

About Voltage

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

Learn more about Voltage →

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 2 medium

A [formula] battery drives a current of [formula] for [formula]. How much energy does it supply?

Example 3 easy

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

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