In a DC circuit with V=28V and R=7Ω, what is the current?

In a DC circuit with V=28V and R=7Ω, what is the current?

• A. 2 A
• B. 4 A
• C. 7 A
• D. 28 A

Answer: (B)

The current is found using Ohm’s law: I = V / R. With V = 28 V and R = 7 Ω, I = 28 / 7 = 4 A. So the circuit carries 4 amperes. The other values would require different voltages: 2 A would need 14 V, 7 A would need 49 V, and 28 A would need 196 V. Since the voltage and resistance are fixed at 28 V and 7 Ω, only 4 A fits.

The current is found using Ohm’s law: I = V / R. With V = 28 V and R = 7 Ω, I = 28 / 7 = 4 A. So the circuit carries 4 amperes.

The other values would require different voltages: 2 A would need 14 V, 7 A would need 49 V, and 28 A would need 196 V. Since the voltage and resistance are fixed at 28 V and 7 Ω, only 4 A fits.