HPQ:Physics:KS4:Energy efficiency:Camilla Leslie
If a new hairdryer is more efficient than your old one
Which statement/s is/are correct?
A It takes in more energy than it gives out
B It costs less to buy but works just as well
C It gives out more energy than it takes in
D it wastes less energy
E it dries your hair more quickly
The answer is D
The students who got this answer alone would more on to more challenging work and all other answer combinations would lead the students to do some further work on efficiency and energy conservation. I would then group the students so each group had to explain why e.g. Response A is incorrect etc.