What formula is used to calculate current in a circuit?

This question tests your knowledge of Ohm's Law, which is the foundational mathematical relationship in electronics. Ohm's Law states that Voltage (E) equals Current (I) multiplied by Resistance (R), which is written as E = I × R. To solve for current (I), you must rearrange the standard equation by dividing both sides by Resistance (R). This results in the formula I = E / R, meaning current equals voltage divided by resistance. You can remember this easily using the Ohm's Law Triangle, with E on top and I and R on the bottom. To find any value, cover it up with your finger: covering I leaves E situated over R, visually giving you the correct division formula.