The figure below shows a sign used to warn drivers of a road hazard.
The sign makes use of two sources of renewable energy, one of which is solar energy. Identify the other source of renewable energy used by the sign.
Tick the correct box.
Fill in the blank spaces to complete one of the useful energy conversions taking place when the sign is operating using solar energy.
solar energy → .................................. → .................................
In certain conditions, the sign cannot use its sources of renewable energy. State these conditions.
The sign needs to be able to operate at all times. Suggest a way of overcoming the problem identified in (c)(i).
After passing the sign, the cars climb a steep hill. State the type of energy gained by cars as they climb the hill.
