To calculate current flowing in a circuit, you must

• A. multiply voltage by resistance (E x R)
• B. divide voltage by resistance (E / R)
• C. subtract resistance from voltage (E - R)
• D. add voltage and resistance (E + R)

Answer: (B)

Current in a circuit is found using Ohm's law, which states that current equals voltage divided by resistance (I = V / R). This means the flow of electrons depends on how hard the voltage pushes them and how much the circuit resists that flow. Dividing the voltage by the resistance gives the correct current in amperes because volts per ohm simplify to amps (1 V / 1 Ω = 1 A).

For example, with a 12-volt source across a 4-ohm resistor, the current is 12 / 4 = 3 A. Multiplying or adding voltage and resistance doesn’t reflect how current responds to the circuit’s push and opposition, so those operations don’t yield the actual current.