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A solar-powered robotic lawnmower uses a photovoltaic solar panel mounted horizontally on its top cover to charge its onboard lithium-ion battery.

Explain one disadvantage of having the solar panel fixed in this horizontal position.

[2]

The average current from the solar panel to the battery is $A3.5\text{ A}$ . Calculate the charge flow to the battery in $seconds4200\text{ seconds}$ . Use the equation: $flow=current×time\text{charge flow} = \text{current} \times \text{time}$

[2]

Write down the equation that links efficiency, total power input, and useful power output.

[1]

At one point during the day, the total power input from sunlight to the panel was $W1500\text{ W}$ . The efficiency of the solar panel was $0.16$ . Calculate the useful power output of the solar panel.

[3]

The wasted energy that is not useful to the panel is dissipated into the environment. What happens to energy that has been dissipated? Select one option:

The energy is destroyed.
The energy becomes less useful.
The energy is completely converted back into sunlight.

[1]

Why is it currently impractical to meet all of a nation's energy needs using solar power alone? Select one option:

Solar energy is a non-renewable resource.
An extremely large land area would need to be covered with solar panels.
Solar panels have an efficiency that is too high.

[1]

Conservation and dissipation of energy Questions

Practise AQA GCSE Physics Conservation and dissipation of energy with exam-style questions for Foundation and Higher tier. 29 questions covering Energy transfers in a system and Efficiency, matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.