An array of solar cells is used to generate carbon-free electrical energy.
State the main form of energy transferred from the Sun to the solar cells for the generation of electrical energy.
Consider the generation of electrical energy by a large number of solar cells.
State one environmental advantage and one environmental disadvantage of using solar cells to generate electricity.
State and explain whether solar energy is a renewable source of energy.
Each group of solar cells is arranged in a rectangle of dimensions 2.0 m×1.2 m2.0\text{ m} \times 1.2\text{ m}2.0 m×1.2 m. The solar cells are situated in a region where they receive 400 W400\text{ W}400 W of solar radiation per square metre. The electrical output of each group of solar cells is a current of 3.0 A3.0\text{ A}3.0 A at a potential difference of 64 V64\text{ V}64 V.
Calculate the efficiency of the solar cells.
533 exam-style questions on CIE IGCSE Physics 1.7 Energy, work and power, covering 1.7.1a Energy stores and energy transfers, 1.7.1b Conservation of energy, 1.7.1c Kinetic and gravitational potential energy, 1.7.2 Work done, 1.7.3 Energy resources, 1.7.3a Energy resources and electricity generation, 1.7.3b Nuclear fusion as an energy source, 1.7.3c Efficiency of energy transfer, and 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.