If the supply voltage remains 12 volts and the current increases from 2 amperes to 4 amperes, what is the resulting wattage?

If the supply voltage remains 12 volts and the current increases from 2 amperes to 4 amperes, what is the resulting wattage?

• A. 24 W
• B. 48 W
• C. 6 W
• D. 12 W

Answer: (B)

Power equals voltage times current, so with a fixed 12-volt supply, doubling the current from 2 A to 4 A doubles the power. 12 × 4 equals 48 watts, up from 12 × 2 = 24 watts. Therefore the resulting wattage is 48 watts. The other values would require different currents at 12 volts: 24 W would occur at 2 A (the original current), 6 W would require 0.5 A, and 12 W would require 1 A.

Power equals voltage times current, so with a fixed 12-volt supply, doubling the current from 2 A to 4 A doubles the power. 12 × 4 equals 48 watts, up from 12 × 2 = 24 watts. Therefore the resulting wattage is 48 watts. The other values would require different currents at 12 volts: 24 W would occur at 2 A (the original current), 6 W would require 0.5 A, and 12 W would require 1 A.