This question is about using the mains electricity supply - Edexcel - GCSE Physics Combined Science - Question 3 - 2021 - Paper 1

Using the formula for energy:

$E = V \times I \times t$

Substituting the known values:

$E = 230 \text{ V} \times 7.4 \text{ A} \times 120 ext{ s}$

Calculating this gives:

$E = 204240 ext{ J}$

Therefore, the energy transferred to the coffee machine is 204240 J.

Wire X = earth Wire Y = live

Component Z = fuse

Using the rearranged formula:

$I_p = \frac{(V_o \times I_{o})}{V_{i}}$

Substituting in the given values:

$I_p = \frac{(190 \text{ V} \times 2.37 ext{ A})}{230 ext{ V}}$

This simplifies to:

$I_p \approx 0.196 ext{ A}$

Thus, the input current to the transformer is approximately 0.196 A.