A renewable energy source is one that will not run out and coal is picked out as non-renewable, so this IB sheet begins by sorting the energy sources themselves. Efficiency is recorded as useful output ÷ total input, with the law of conservation of energy behind it.
Key Takeaways
A renewable source is one that will not run out (Q1).
Coal is a non-renewable energy source (Q2).
Efficiency is useful output ÷ total input × 100% (Q3).
Section A: Multiple Choice Questions (1 Mark Each)
Choose the correct option for each question.
1.A renewable energy source is one that
(a) will not run out(b) is always cheap(c) produces no noise(d) is stored underground
2.Which of these is a non-renewable energy source?
(a) coal(b) solar(c) wind(d) hydroelectric
3.The efficiency of a device is given by
(a) useful output ÷ total input × 100%(b) total input ÷ useful output(c) useful output × total input(d) input − output
4.Energy can never be created or destroyed. This is the
(a) law of conservation of energy(b) law of refraction(c) second law of motion(d) Ohm's law
5.A solar panel converts light energy directly into
(a) electrical energy(b) chemical energy(c) nuclear energy(d) sound energy
6.In a wind turbine, the kinetic energy of the moving air is converted into
(a) electrical energy(b) chemical energy(c) thermal energy(d) light energy
Section B: Short Answer Type Questions (2 Marks Each)
Show all steps clearly.
7.Define a renewable energy source.
8.Give two examples of renewable energy sources.
9.What is the efficiency of a device that converts all of its input energy usefully?
10.State the law of conservation of energy.
11.What is the main energy loss in most machines?
12.Write the formula for efficiency.
13.Give one advantage of hydroelectric power.
14.Give one disadvantage of solar power.
Section C: Numericals & Word Problems (3 Marks Each)
Apply the concepts to solve the problems. Show all working.
15.A machine receives 500 J of energy and transfers 300 J usefully. Find its efficiency as a percentage.
16.A power station has an input energy of 1000 MJ and produces 350 MJ of electricity. Find its efficiency.
17.A light bulb uses 60 J of energy and produces 6 J of light. Find its efficiency.
18.A solar panel receives 800 J of sunlight and produces 160 J of electricity. Find its efficiency.
19.A car engine is 25% efficient and produces 25 kJ of useful energy. Find the total input energy.
20.A kettle uses 200 kJ of energy and transfers 180 kJ to the water. Find its efficiency.
Answer Key
1. a) will not run out
2. a) coal
3. a) useful output ÷ total input × 100%
4. a) law of conservation of energy
5. a) electrical energy
6. a) electrical energy
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End of Worksheet
People Also Ask
What is a renewable energy source?
One that will not run out, option (a) in this worksheet (Q1).
Which of these is non-renewable?
Coal, option (a) in this worksheet (Q2).
How is efficiency calculated?
Useful output ÷ total input × 100%, option (a) in this worksheet (Q3).
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