What is charge?

Charge (Q) is a measure of the total current (I) that flowed within a period of time (t).

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What are the units of charge?

Coulombs (C)

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What is the formula linking charge (Q), current (I) and time (t)?

Q = I x t


Q = Charge (C)

I = current (A)

t = time (s)

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What is the charge of an electron?

-1.6 x 10-19 C

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How can we find the number of electrons that have flown passed a point?

  1. Identify the charge using Q = I x t
  2. Calculate the number of electrons using


number of electrons = charge of electroncharge​

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Does conventional current flow positive to negative or negative to positive?

Positive to negative.

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How does electron flow differ to conventional current?

Electron flow is negative to positive.

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What is Kirchoff's first law?

The total current flowing into a junction is equal to the total current flowing out of a junction.

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