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Sagot :
Answer:
The correct answer is C. 31 watts.
Explanation:
Here's why answer C (31 watts) is the correct answer for the toaster's power usage:
We can use the formula for power (P) in an electrical circuit: P = V^2 / R
P: Power (in watts)
V: Voltage (in volts)
R: Resistance (in ohms)
We are given the voltage (V) = 120 volts and resistance (R) = 460 ohms.
Plugging the values into the formula:
P = (120 volts)^2 / 460 ohms
To simplify the calculation, we can break down 120^2 into (100 + 20)^2 and distribute:
P = [(100)^2 + (20 x 20) + (2 x 100 x 20)] / 460 ohms
Calculate each term separately:
P = [10,000 + 400 + 4000] / 460 ohms
P = 14,400 / 460 ohms
Divide to find the power:
P ≈ 31.3 watts (rounded to two decimal places)
Therefore, the toaster uses approximately 31 watts of power.
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