A student studied the relationship between the current,voltage,and resistance in a direct circuit.To obtain the results presented in Figure 1 and Table 1,the student constructed the circuit shown below.The student used 3 resistors and different amounts of voltage generate Table 1.The current was read from the ammeter.To obtain the results in Table 1,a 5-ohm resistor (Resistor 4)was used varid .The current was measured at the power was then calculated.If the voltage in the circuit used to generate Table 1 were set at 12.5 V, the power would most nearly equal:

Correct answer: B. 31.2 W

A. 12.5 W
B. 31.2 W
C. 37.5 W
D. 57.5 W

Explanation

The correct answer is Option B: 31.2 W. To calculate power in a circuit, you need to multiply the voltage (12.5 V) by the current. Given that the current was not directly provided in the question, it can be calculated using the resistance (5 ohms) and Ohm's Law (V = IR). Therefore, the current would be 12.5 V / 5 ohms = 2.5 A. Now, P = VI, so the power would be 12.5 V * 2.5 A = 31.25 W, which rounds to 31.2 W. The other options do not correctly apply the formula for power in a circuit, resulting in incorrect values.

Last updated 3 September 2026

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