If a circuit has 10 volts across 2 ohms, what is the current?

If a circuit has 10 volts across 2 ohms, what is the current?

• A. 2.0 A
• B. 5 A
• C. 10 A
• D. 0.5 A

Answer: (B)

This uses Ohm's law, which links voltage, current, and resistance. Current equals voltage divided by resistance. With 10 volts across 2 ohms, the current is I = V / R = 10 V / 2 Ω = 5 amperes. So the current is 5 A. Why the other values don’t fit: 2 A would require a higher resistance (10 V / 2 A = 5 Ω); 0.5 A would require 20 Ω; 10 A would require 1 Ω. The given 10 V across 2 Ω only yields 5 A.

This uses Ohm's law, which links voltage, current, and resistance. Current equals voltage divided by resistance. With 10 volts across 2 ohms, the current is I = V / R = 10 V / 2 Ω = 5 amperes. So the current is 5 A.

Why the other values don’t fit: 2 A would require a higher resistance (10 V / 2 A = 5 Ω); 0.5 A would require 20 Ω; 10 A would require 1 Ω. The given 10 V across 2 Ω only yields 5 A.