Charge & Current
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19 Terms
Electric current definition
Flow of electric charge
Charge symbol
Q
Charge unit
Coulombs (C)
Current symbol
I
Current unit
Amperes (A)
Current meaning
Rate of flow of charge
Formula
Current = charge ÷ time
Symbol equation
I = Q ÷ t
Rearranged formula for charge
Q = I × t
Rearranged formula for time
t = Q ÷ I
Charge carriers in metals
Electrons
Direction of electron flow
Negative to positive
Conventional current direction
Positive to negative
Reason for conventional direction
Historical choice before electrons were discovered
Current in series circuit
Same at all points
Current in parallel circuit
Splits between branches
Charge flow meaning
How much charge passes a point in a given time
Example
2 A current for 5 s → charge = 10 C
Key idea
Current is the rate at which charge flows through a circuit
