Figure 1 shows an electric car being recharged - AQA - GCSE Physics - Question 1 - 2021 - Paper 1

The correct equation is:

energy transferred = power × time.

To calculate the time taken to recharge the battery, we use the equation:

$E = P × t$

Substituting the given values:

$162000000 = 7200 × t$

Now, solving for t:

$t = \frac{162000000}{7200} \approx 22500 \text{ seconds}$

The correct equation is:

$V = I × R$.

Using Ohm's Law:

$480 = 15 × R$

Rearranging gives:

$R = \frac{480}{15} = 32 \text{ ohms}$.

The time taken using system A is half the time of system B, since system A has a lower current (13 A) compared to system B (26 A).