Which formula gives current?

Which formula gives current?

• A. I = V / R
• B. V = I * R
• C. R = V / I
• D. P = V * I

Answer: (A)

Current is the flow of electric charge, and Ohm's law ties together current, voltage, and resistance. The way to get current directly is to divide the voltage by the resistance: I = V / R. This form shows exactly how much current flows when you know the voltage across a component and its opposition to current. The other expressions describe different quantities: voltage is V = I × R, resistance is R = V / I, and power is P = V × I. They either refer to other quantities or would require rearranging to solve for current, whereas I = V / R gives current outright.

Current is the flow of electric charge, and Ohm's law ties together current, voltage, and resistance. The way to get current directly is to divide the voltage by the resistance: I = V / R. This form shows exactly how much current flows when you know the voltage across a component and its opposition to current. The other expressions describe different quantities: voltage is V = I × R, resistance is R = V / I, and power is P = V × I. They either refer to other quantities or would require rearranging to solve for current, whereas I = V / R gives current outright.