To calculate a resistance value using Ohm's law, what operation should you perform?

In order to calculate resistance using Ohm's law, the correct operation involves dividing voltage (E) by current (I). Ohm's law is commonly expressed by the formula ( R = \frac{E}{I} ), where ( R ) represents resistance measured in ohms, ( E ) is the voltage in volts, and ( I ) is the current in amperes.

By performing this division, you can determine how much resistance is present in a circuit based on the voltage across it and the current flowing through it. This fundamental principle is essential in electrical and plumbing systems where understanding the relationship between voltage, current, and resistance is necessary for troubleshooting and system design.

The other operations—such as multiplying, adding, or subtracting voltage from current—do not adhere to the principles of Ohm's law and therefore do not yield the resistance value needed to analyze electrical circuits effectively.