1Which of these has the same dimensions as electric current?
Electric current and displacement current both have the dimensions [A].
SI base quantitiesClass 11, Units and Measurements
Dimensional formula of Electric current
[A]
The SI base quantity of electricity. Charge is built from it, current is not built from charge in the SI system.
How to get the dimensional formula of electric current
- Electric current is one of the seven SI base quantities, so its dimension is written directly: [A].
Quantities with the dimensions [A]
Equal dimensions do not make them the same quantity. Compare electric current with the others in the full grid.
Three questions on electric current
2What is the SI unit of electric current?
The SI unit of electric current is the ampere (A).
3Do electric current and time have the same dimensions?
Electric current is [A] but time is [T].
An equation that uses electric current
Equation checker
Matching dimensions are necessary, not sufficient. A check cannot see pure numbers such as 1/2 or 2π, so a consistent equation can still be wrong.
Read as
U = (1/2) L I2U[M L2 T-2]=1/2 L I2[M L2 T-2]Dimensionally consistentEvery term is [M L2 T-2]
U = energy
Electric current: quick answers
What is the dimensional formula of electric current?
The dimensional formula of electric current is [A]. It is one of the seven SI base quantities.
What is the SI unit of electric current?
The SI unit of electric current is the ampere (A).
Which quantities have the same dimensions as electric current?
Electric current shares [A] with displacement current. Equal dimensions do not make them the same quantity.