Using Ohm's Law, how is voltage calculated?

Using Ohm's Law, how is voltage calculated?

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

Answer: (D)

Voltage in a simple circuit with a resistor is found by multiplying the current through the element by its resistance: V = I × R. This reflects how Ohm’s Law describes a linear relationship between these three quantities, with voltage acting as the product of how much current is flowing and how much the component resists that flow. Unit-wise, amps times ohms gives volts, which aligns with how these quantities interact in circuits. For example, if 3 amperes pass through a 4-ohm resistor, the voltage across it is 12 volts. If you know voltage and resistance and want the current, you can rearrange to I = V / R; if you know voltage and current and want resistance, R = V / I. The other forms that involve division in the wrong place or addition/subtraction don’t reflect Ohm’s Law for a basic linear resistor.

Voltage in a simple circuit with a resistor is found by multiplying the current through the element by its resistance: V = I × R. This reflects how Ohm’s Law describes a linear relationship between these three quantities, with voltage acting as the product of how much current is flowing and how much the component resists that flow.

Unit-wise, amps times ohms gives volts, which aligns with how these quantities interact in circuits. For example, if 3 amperes pass through a 4-ohm resistor, the voltage across it is 12 volts.

If you know voltage and resistance and want the current, you can rearrange to I = V / R; if you know voltage and current and want resistance, R = V / I. The other forms that involve division in the wrong place or addition/subtraction don’t reflect Ohm’s Law for a basic linear resistor.