Charge, Current & Time

This lesson covers:

  1. What charge is
  2. The charge equation: Q=ItQ=It

Charge / Voltage


is a measure of the total current that flowed within a period of time

Charge

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The formula for charge is:

charge=currenttime\text{charge}=\frac{\text{current}}{\text{time}}

charge=current×time\text{charge}=\text{current}\times\text{time}

charge=timecurrent\text{charge}=\frac{\text{time}}{\text{current}}

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The units for charge are:

Coulombs (C)

Watts (W)

Volts (V)

Amperes (A)

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The symbol formula for charge is:

Q=tIQ=\frac{t}{I}

Q=ItQ=It

Q=ItQ=\frac{I}{t}

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2 A of current flowed for 30 s.


How much charge flowed in that time period?

60

C

C

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30 C of charge flowed through a wire in 10 s.


What is the current in the wire?

3

A

A

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0.5 A of current flowed for 20 minutes.


How much charge flowed in that time period?

600

C

C

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