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Answer :
Final answer:
The power rating of the light bulb, given the energy it dissipates over a specific time, is calculated to be approximately 22.6 Watts.
Explanation:
To determine the power rating of the light bulb, we can use the information that a constant current of 913 mA (0.913 Amperes) flows through it for a period of 45 minutes, and during this period, the light bulb gives off 61 kJ (61,000 Joules) of energy in the form of light and heat. The power dissipated can be found using the formula for power (P) in terms of energy (E) and time (t), which is P = E / t.
First, convert the 45 minutes into seconds to have consistent units (45 minutes = 2700 seconds). Then, use the given energy value and time to calculate power. Plugging the values into the formula gives P = 61,000 Joules / 2700 seconds = 22.59 Watts. Hence, the power rating of the light bulb is approximately 22.6 Watts.
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