Question 40/17 answered · 40 marks total
WRITTEN ONLY
[7]Question 4 — Planning: comparing electrical heaters
Written only — plan an experiment comparing how quickly five 12 V heaters bring water to the boil.
YOUR ANSWERS
4[7]
A student thinks some of five identical 12 V heaters are more efficient than others. Plan an experiment to compare how quickly the heaters increase the temperature of water to boiling point, using electrical heaters, beakers, a supply of water and a 12 V power supply, plus any other normal laboratory apparatus. You are not required to do the experiment: list additional apparatus, explain how you'd carry out the investigation and the measurements taken, state the key variables to keep constant, draw a suitable results table (headings only), and explain how you'd reach a conclusion.