Calculating with electric charge
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I can explain the equations: I = Q ÷ t, V = E ÷ Q, P = I × V, and V = I × R, and use them in calculations.
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Electric charge, Q, is measured in coulombs (C).
Electric current is a measure of the rate of flow of electric charge, calculated using: I = Q ÷ t.
Potential difference is a measure of the energy transferred by each coulomb of charge, calculated using: V = E ÷ Q.
Combining I = Q ÷ t and V = E ÷ Q gives the equation: E ÷ t = I × V. This is equivalent to P = I × V.
Unknown variables in the power equation can often be calculated using: I = V ÷ R.
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