Final answer:
According to Ohm's law, the voltage drop V across a resistor when a current flows through it is V = IR. To determine the battery voltage needed to send 2.5 A of current through a light bulb with 3.6 Ω of resistance, we rearrange Ohm's law and substitute the known values.
Step-by-step explanation:
According to Ohm's law, the voltage drop V across a resistor when a current flows through it is calculated using the equation V = IR, where I equals the current in amps (A) and R is the resistance in ohms. To determine the battery voltage needed to send 2.5 A of current through a light bulb with 3.6 Ω of resistance, we rearrange Ohm's law as V = IR. Substituting the known values, we have V = (2.5 A)(3.6 Ω), which gives us a battery voltage of 9 V.