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Junior Cycle · Junior Cycle Science

Junior Cycle Science: Energy conversions & efficiency

How often Energy conversions & efficiency comes up on the Science papers, every year it was asked, and questions to try.

CL Asked on 5 of the last 6 Common Level papers, most recently in 2026. most years

Energy conversions & efficiency, Common Level(7 marks)

Quick ones on Energy conversions & efficiency.

(a)What energy conversion happens in a battery-powered torch?
  1. Light to chemical to heat
  2. Chemical to electrical to light
  3. Heat to chemical to sound
(b)What does the law of conservation of energy state?
  1. Energy can be made from nothing
  2. Energy is always used up and lost
  3. Energy cannot be made or destroyed
(c)A bulb takes in 100 J of electrical energy and gives out 20 J of light. What is its efficiency?
  1. 20%
  2. 120%
  3. 80%
Show the answers

(a) Chemical to electrical to light

(b) Energy cannot be made or destroyed

(c) 20%

Your turn: Common Level questions on Energy conversions & efficiency.

Common Level

Asked on 5 of the last 6 Common Level papers, most recently in 2026. most years

Every paper, year by year

YearWhere it came up
2026Q8
2025Not asked
2024Q9, Q11
2023Q12
2022Q15
2019Q13

Links open the State Examinations Commission’s paper for that year.

More Energy conversions & efficiency questions

Energy conversions & efficiency, 3 marks

In a Sankey diagram, what does the width of each arrow show?

  1. The speed of the device
  2. The type of energy
  3. The amount of energy
Show the answer

The amount of energy

Arrow width is drawn to scale with the amount of energy. The useful output goes straight on; wasted energy, usually heat, branches off. The widths in and out must match.

Other Science topics

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