What is the formula for the voltage drop across a load given current and resistance?

What is the formula for the voltage drop across a load given current and resistance?

• A. V = I × R
• B. V = R / I
• C. V = I / R
• D. V = I + R

Answer: (A)

Voltage drop across a load follows Ohm's law: V = I × R. This means the voltage in volts equals the current in amperes times the resistance in ohms. The relationship makes sense because increasing either current through a fixed resistance or resistance for a given current increases the voltage drop. For example, 2 A through a 5 Ω load gives 10 V. The other expressions don’t fit the physical relationship: they would produce incorrect units (ohms divided by amperes or amperes divided by ohms) or mix quantities that don’t add to voltage (like current and resistance) in a way that doesn’t reflect how voltage, current, and resistance relate.

Voltage drop across a load follows Ohm's law: V = I × R. This means the voltage in volts equals the current in amperes times the resistance in ohms. The relationship makes sense because increasing either current through a fixed resistance or resistance for a given current increases the voltage drop. For example, 2 A through a 5 Ω load gives 10 V. The other expressions don’t fit the physical relationship: they would produce incorrect units (ohms divided by amperes or amperes divided by ohms) or mix quantities that don’t add to voltage (like current and resistance) in a way that doesn’t reflect how voltage, current, and resistance relate.