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

To find the energy supplied to the notebook computer each second, we can use the relationship between power and energy. Power is defined as the energy consumed per unit of time.

The electrical power formula is given by:

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

Where:

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

For this question, the power rating of the notebook computer is given as 40 W, and since energy is supplied each second, we can assume $t = 1$ s. Therefore, rearranging the formula gives:

$E = P \cdot t$

Substituting the known values:

$E = 40 ext{ W} \cdot 1 ext{ s} = 40 ext{ J}$

Thus, the energy supplied to the computer each second is 40 J. In the answer options provided, the correct choice is:

C 40 J.