What is the voltage formula that relates voltage to current and resistance?

What is the voltage formula that relates voltage to current and resistance?

• A. Voltage = current × resistance.
• B. Voltage = energy transferred per unit charge.
• C. Voltage = charge × resistance.
• D. Voltage = current ÷ resistance.

Answer: (A)

Ohm's law shows how voltage, current and resistance connect. The voltage across a resistor equals the current through it times its resistance: V = I × R. This means if you double the current through the same resistor, you must double the voltage to push that larger current; if you increase the resistance, you need more voltage to drive the same current. The units line up nicely: volts are equal to amperes times ohms. The concept that voltage is energy transferred per unit charge is correct in its own right, but it doesn’t give a formula involving current and resistance. The other options don’t fit because they either mix up the relationship or use the wrong operation: dividing current by resistance is not the correct form, and multiplying charge by resistance doesn’t yield voltage.

Ohm's law shows how voltage, current and resistance connect. The voltage across a resistor equals the current through it times its resistance: V = I × R. This means if you double the current through the same resistor, you must double the voltage to push that larger current; if you increase the resistance, you need more voltage to drive the same current. The units line up nicely: volts are equal to amperes times ohms. The concept that voltage is energy transferred per unit charge is correct in its own right, but it doesn’t give a formula involving current and resistance. The other options don’t fit because they either mix up the relationship or use the wrong operation: dividing current by resistance is not the correct form, and multiplying charge by resistance doesn’t yield voltage.