1) In a DC current... a) the current is in the same direction b) The current changes direction 2) Which of these is not a method of harnessing energy from the sun? a) solar panels b) wind turbines c) curved mirrors d) nuclear energy e) passive solar heating 3) Which of these is not an advantage of solar panels? a) low maintenance b) no power at night or in bad weather c) no need for fuel d) no polluting waste 4) Which of these is an advantage of wind turbines? a) visual pollution b) use depends on wind speed c) needs appropriate speed d) no polluting waste 5) Which of these will not increase the power produced by a photocell? a) lower light intensity b) bigger surface area c) lower distance from the sun d) higher light intensity 6) Which produces AC current? a) Battery b) Generator 7) Which of these will increase the current from a dynamo? a) Less coils b) Weaker magnet c) Faster movements 8) Which of these is not a step in generating electricity? a) turbine turns the generator b) steam turns the generator c) steam turns the turbine d) fuel is burnt e) water boils to make steam 9) In which direction should a solar panel face in the northern hemisphere? a) East b) West c) South d) North 10) What happens to the wavelength of light when it has been absorbed then emitted? a) gets shorter b) stays the same c) gets longer

p2a and b quiz

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