In the equation E = I × R, which quantity does R represent?

In the equation E = I × R, which quantity does R represent?

• A. Voltage
• B. Resistance
• C. Current
• D. Power

Answer: (B)

R represents resistance, the property that opposes the flow of electric current. In this form of Ohm’s law, voltage (E) equals current (I) times resistance (R), so R is the factor that converts current into voltage for that element. Resistance is measured in ohms and can be found with R = E / I. This is why the role of the quantity multiplying current to produce voltage is the resistance. Voltage is the potential difference, and power relates to voltage and current by P = V × I, not through the V = I × R form.

R represents resistance, the property that opposes the flow of electric current. In this form of Ohm’s law, voltage (E) equals current (I) times resistance (R), so R is the factor that converts current into voltage for that element. Resistance is measured in ohms and can be found with R = E / I. This is why the role of the quantity multiplying current to produce voltage is the resistance. Voltage is the potential difference, and power relates to voltage and current by P = V × I, not through the V = I × R form.