A small notebook computer has a power rating of 40 W - Edexcel - GCSE Physics - Question 4 - 2012 - Paper 1

To determine the energy supplied to the computer each second, we can use the relationship between power, energy, and time:

$P = \frac{E}{t}$

Where:

• $P$ is the power in watts (W),
• $E$ is the energy in joules (J),
• $t$ is time in seconds (s).

In this situation, the power rating of the notebook computer is given as 40 W. Since power is defined as the amount of energy transferred per unit time, we can conclude that the computer consumes 40 joules of energy each second. Therefore, the correct answer is:

✔ C 40 J