What is the symbol for current?

What is the symbol for current?

• A. I
• B. J
• C. C
• D. Q

Answer: (A)

Current is the flow of electric charge over time. In most circuit diagrams and equations, this flow is denoted by the letter I. This comes from the relationship I = dQ/dt, where Q is charge, so current measures how much charge passes a point each second. The unit of current is the Ampere, symbol A. While instantaneous current in time-varying signals is often written as i(t), the standard symbol for the current magnitude in circuits is I. The other symbols refer to related quantities: Q is charge, J is current density (A per square meter), and C is capacitance.

Current is the flow of electric charge over time. In most circuit diagrams and equations, this flow is denoted by the letter I. This comes from the relationship I = dQ/dt, where Q is charge, so current measures how much charge passes a point each second. The unit of current is the Ampere, symbol A. While instantaneous current in time-varying signals is often written as i(t), the standard symbol for the current magnitude in circuits is I. The other symbols refer to related quantities: Q is charge, J is current density (A per square meter), and C is capacitance.