Electric Charge Calculator
Calculate charge transferred from current and time.
Formula
Q = It.
What Is Electric Charge Transfer?
Electric current measures how quickly charge flows. When current is approximately constant, total transferred charge equals current multiplied by elapsed time: Q = It.
Example Calculation
A current of 2.5 A flowing for 20 seconds transfers 2.5 × 20 = 50 C of charge.
Factors That Affect the Result
Charge increases directly with current and time. The formula assumes constant current over the interval. If current changes with time, total charge is found by integrating current rather than multiplying one value by total time.
Interpreting the Result
One coulomb corresponds to one ampere flowing for one second. Charge can also be related to particle count through the elementary charge.
Frequently Asked Questions
What is a coulomb?
A coulomb is the SI unit of electric charge.
Is current the same as charge?
No. Current is the rate of charge flow, measured in coulombs per second.
Can charge be negative?
Yes. Sign can represent charge type or direction under a chosen convention.
Related Tools
Formula and Practical Limits
Electric charge transferred by steady current is Q = It. Current that changes with time requires integration rather than a simple multiplication, and charge can be expressed in coulombs or related units.