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

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

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

Answer: (D)

I represents current, the flow of electric charge through a conductor. In Ohm’s law, voltage (E) equals current times resistance, so the quantity that, when multiplied by resistance, gives the voltage is the current. Current is measured in amperes and tells you how much charge passes a point per second. The other quantities don’t fit this symbol in the equation: voltage is the driving potential difference, not I; resistance is the opposition to current, not I; power is the rate of energy transfer and is not part of this specific relationship.

I represents current, the flow of electric charge through a conductor. In Ohm’s law, voltage (E) equals current times resistance, so the quantity that, when multiplied by resistance, gives the voltage is the current. Current is measured in amperes and tells you how much charge passes a point per second.

The other quantities don’t fit this symbol in the equation: voltage is the driving potential difference, not I; resistance is the opposition to current, not I; power is the rate of energy transfer and is not part of this specific relationship.