If voltage and resistance are known, what formula is used to find current?

If voltage and resistance are known, what formula is used to find current?

• A. I = E x R
• B. I = E/R
• C. I = R/E
• D. I = E + R

Answer: (B)

The formula used to find current when voltage and resistance are known is derived from Ohm's Law, which states that current is directly proportional to voltage and inversely proportional to resistance. The correct formula expressed mathematically is \( I = E / R \), where I represents current, E represents voltage, and R represents resistance. This relationship is fundamental to electrical circuits and allows for the calculation of current if voltage and resistance values are provided. By dividing the voltage (the potential difference) by the resistance (the opposition to the flow of current), you accurately determine the amount of current flowing through the circuit. This formula effectively illustrates how, for a given resistance, increasing the voltage will lead to a proportional increase in current, while increasing resistance will have the opposite effect, reducing the current for a given voltage. Understanding and applying this formula is key for analyzing and troubleshooting electrical systems.

The formula used to find current when voltage and resistance are known is derived from Ohm's Law, which states that current is directly proportional to voltage and inversely proportional to resistance. The correct formula expressed mathematically is ( I = E / R ), where I represents current, E represents voltage, and R represents resistance.

This relationship is fundamental to electrical circuits and allows for the calculation of current if voltage and resistance values are provided. By dividing the voltage (the potential difference) by the resistance (the opposition to the flow of current), you accurately determine the amount of current flowing through the circuit.

This formula effectively illustrates how, for a given resistance, increasing the voltage will lead to a proportional increase in current, while increasing resistance will have the opposite effect, reducing the current for a given voltage. Understanding and applying this formula is key for analyzing and troubleshooting electrical systems.