Which statement about electric current is true?

Which statement about electric current is true?

• A. Current is the flow of electrons exclusively
• B. Current is the rate of flow of electric charge
• C. Current is the energy carried by charges
• D. Current cannot be measured

Answer: (B)

Electric current is the rate at which electric charge passes a point in a circuit. This means how much charge flows per unit time, with the size of the current given by I = ΔQ/Δt and measured in amperes. In wires, electrons are typically the charge carriers, but current is defined as the flow of positive charge, so its direction is opposite to the actual electron movement in metals. Current is not energy carried by charges; energy transfer depends on voltage and how much charge moves, not on current alone. And yes, current can be measured with an ammeter placed in series in the circuit.

Electric current is the rate at which electric charge passes a point in a circuit. This means how much charge flows per unit time, with the size of the current given by I = ΔQ/Δt and measured in amperes. In wires, electrons are typically the charge carriers, but current is defined as the flow of positive charge, so its direction is opposite to the actual electron movement in metals. Current is not energy carried by charges; energy transfer depends on voltage and how much charge moves, not on current alone. And yes, current can be measured with an ammeter placed in series in the circuit.