What formula can be derived from the equation E = IR to isolate I?

The equation E = IR represents Ohm's Law, where E is the voltage (measured in volts), I is the current (measured in amperes), and R is the resistance (measured in ohms). To isolate I, you need to manipulate the equation.

Starting with E = IR, you can rearrange this equation to solve for I by dividing both sides by R. This gives you:

I = E / R.

This formula shows that the current (I) is equal to the voltage (E) divided by the resistance (R). This relationship is fundamental in understanding how voltage, current, and resistance interact in an electrical circuit.

The other options do not correctly represent the mathematical relationship derived from the original equation. For example, multiplying E by R inaccurately portrays the relationship, while adding or subtracting these quantities does not mathematically isolate the current. Thus, the correct formula to isolate I is indeed I = E / R.