The current through a 28-volt, 30-watt device is approximately

The current through a 28-volt, 30-watt device is approximately

• A. 0.5 A
• B. 1.1 A
• C. 2.0 A
• D. 5.0 A

Answer: (B)

Current is found by dividing the device’s power rating by the supply voltage, since P = VI. So I = P / V = 30 W / 28 V ≈ 1.071 A, which rounds to about 1.1 A. The option around 1.1 A is the correct fit. Why the others don’t fit: 0.5 A would imply roughly 14 W at 28 V, 2.0 A would imply about 56 W, and 5.0 A would imply about 140 W. None match the 30 W rating at 28 V.

Current is found by dividing the device’s power rating by the supply voltage, since P = VI. So I = P / V = 30 W / 28 V ≈ 1.071 A, which rounds to about 1.1 A. The option around 1.1 A is the correct fit.

Why the others don’t fit: 0.5 A would imply roughly 14 W at 28 V, 2.0 A would imply about 56 W, and 5.0 A would imply about 140 W. None match the 30 W rating at 28 V.