Using Ohm's Law, the voltage across a component is V = I × R; if I = 2 A and R = 3 Ω, V equals?

Using Ohm's Law, the voltage across a component is V = I × R; if I = 2 A and R = 3 Ω, V equals?

• A. V = I × R
• B. V = R × I^2
• C. V = I × R^2
• D. V = R / I

Answer: (A)

Voltage comes from multiplying current by resistance in Ohm's Law. With a current of 2 amperes and a resistance of 3 ohms, the voltage is 2 × 3 = 6 volts. The units line up since amperes times ohms give volts (A × Ω = V). The other forms try to square either current or resistance or divide, which doesn’t match V = IR and would give 18 V, 12 V, or 1.5 V respectively. So the correct relationship is V = I × R, yielding 6 V.

Voltage comes from multiplying current by resistance in Ohm's Law. With a current of 2 amperes and a resistance of 3 ohms, the voltage is 2 × 3 = 6 volts. The units line up since amperes times ohms give volts (A × Ω = V). The other forms try to square either current or resistance or divide, which doesn’t match V = IR and would give 18 V, 12 V, or 1.5 V respectively. So the correct relationship is V = I × R, yielding 6 V.