Which expression represents current according to the example I = E / R?

Which expression represents current according to the example I = E / R?

• A. I = E / R
• B. E = I / R
• C. I = R / E
• D. I = E * R

Answer: (A)

The main relationship here is Ohm’s law, which ties current to voltage and resistance. Current is how much charge flows per second, and it depends on the voltage pushing the charge and the resistance opposing the flow. The equation I = V / R expresses that current equals voltage divided by resistance. In this scenario, E is being used for voltage, so the expression becomes I = E / R. This form makes sense because increasing voltage while keeping resistance the same increases current, and increasing resistance while keeping voltage the same decreases current. Why the other forms don’t fit: if voltage were on the left as E = I / R, that would imply voltage equals current divided by resistance, which doesn’t align with the units or the way voltage drives current. If current were written as I = R / E, that would set current proportional to resistance and inversely proportional to voltage, contradicting Ohm’s law. And I = E × R would multiply voltage and resistance, yielding units that don’t match current and producing an incorrect relationship between these quantities.

The main relationship here is Ohm’s law, which ties current to voltage and resistance. Current is how much charge flows per second, and it depends on the voltage pushing the charge and the resistance opposing the flow. The equation I = V / R expresses that current equals voltage divided by resistance. In this scenario, E is being used for voltage, so the expression becomes I = E / R. This form makes sense because increasing voltage while keeping resistance the same increases current, and increasing resistance while keeping voltage the same decreases current.

Why the other forms don’t fit: if voltage were on the left as E = I / R, that would imply voltage equals current divided by resistance, which doesn’t align with the units or the way voltage drives current. If current were written as I = R / E, that would set current proportional to resistance and inversely proportional to voltage, contradicting Ohm’s law. And I = E × R would multiply voltage and resistance, yielding units that don’t match current and producing an incorrect relationship between these quantities.