Using Ohm's law, if the current is 2 amps and the resistance is 55 ohms, what is the voltage?

Using Ohm's law, if the current is 2 amps and the resistance is 55 ohms, what is the voltage?

• A. 115 volts
• B. 120 volts
• C. 27 - 1/2
• D. 110 volts

Answer: (D)

Ohm's law relates voltage, current, and resistance as V = I × R. With a current of 2 A and a resistance of 55 Ω, the voltage is 2 × 55 = 110 volts. So the voltage is 110 V. The other values don’t fit because they would require a different product of current and resistance (for example, 115 or 120 V would need a larger product, while 27.5 V would come from 0.5 A across 55 Ω). The key idea is that voltage is the product of current and resistance.

Ohm's law relates voltage, current, and resistance as V = I × R. With a current of 2 A and a resistance of 55 Ω, the voltage is 2 × 55 = 110 volts. So the voltage is 110 V. The other values don’t fit because they would require a different product of current and resistance (for example, 115 or 120 V would need a larger product, while 27.5 V would come from 0.5 A across 55 Ω). The key idea is that voltage is the product of current and resistance.