Figure 1 shows a solar-powered charger for a mobile phone - Edexcel - GCSE Physics - Question 1 - 2016 - Paper 1

The energy collected by the solar cell is converted into chemical energy, which is then stored in the rechargeable battery of the charger for powering the mobile phone.

To calculate the energy produced, follow these steps:

1. Calculate the Area: The area of the solar cell is given by: $A = 7 ext{ cm} imes 11 ext{ cm} = 77 ext{ cm}^2$

2. Efficiency Calculation: The power output can be calculated as: $ext{Power} = A imes ext{efficiency}$ where efficiency = 0.12 (12%). Thus: $ext{Power} = 77 imes 0.12 = 9.24 ext{ watts}$

3. Energy Calculation: Since the duration of exposure is 1 hour (3600 seconds), the energy produced is: $E = ext{Power} imes ext{time} = 9.24 imes 3600 = 33,264 ext{ joules}$

Therefore, the energy produced by the solar cell is approximately 33,264 joules.

The heating effect of an oven is primarily due to the use of microwaves that agitate water molecules in food, producing heat.

In contrast, a mobile phone generates heat from its internal components during operation, but it does not use the same mechanism as an oven. Since the power output of a phone is far less than that of an oven, the heating effect from a phone is considerably smaller than that from an oven; hence the oven produces a greater heating effect.