If the applied voltage is 80 volts and the resistance is 20 ohms, what is the total current?

If the applied voltage is 80 volts and the resistance is 20 ohms, what is the total current?

• A. 2 A
• B. 4 A
• C. 6 A
• D. 8 A

Answer: (B)

Ohm's law links voltage, current, and resistance: I equals V divided by R. With 80 volts across a 20-ohm load, the current is 80/20, which equals 4 amperes. So the total current is 4 A. If you think about the other numbers, 2 A would come from a 40-ohm load, 6 A would require about 13.3 ohms, and 8 A would require 10 ohms, but for 20 ohms the current comes out to 4 A.

Ohm's law links voltage, current, and resistance: I equals V divided by R. With 80 volts across a 20-ohm load, the current is 80/20, which equals 4 amperes. So the total current is 4 A. If you think about the other numbers, 2 A would come from a 40-ohm load, 6 A would require about 13.3 ohms, and 8 A would require 10 ohms, but for 20 ohms the current comes out to 4 A.