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Northern IrelandPhysics

Energy

5 dot points across 5 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

What are our main energy resources, and what are the advantages and disadvantages of each?

Renewable and non-renewable energy resources, how electricity is generated from them, and the advantages and disadvantages of each.
A CCEA GCSE Physics answer on the difference between renewable and non-renewable energy resources, how each is used to generate electricity, and the advantages and disadvantages of fossil fuels, nuclear and the main renewables.
11 min answer →

What are the different energy stores, and what does it mean to say energy is conserved?

The main energy stores and the ways energy is transferred, the principle of conservation of energy, and dissipation of energy to the surroundings.
A CCEA GCSE Physics answer on the main energy stores and the ways energy is transferred between them, the principle of conservation of energy, and how energy is dissipated as heat to the surroundings.
10 min answer →

How do we calculate the energy of a moving object and the energy of a raised object?

Kinetic energy from E = half m v squared, gravitational potential energy from E = mgh, and using conservation of energy to link them.
A CCEA GCSE Physics answer on calculating kinetic energy with half m v squared and gravitational potential energy with mgh, and using conservation of energy to link the two stores in falling objects.
11 min answer →

What is power, and how do we measure how efficiently a device transfers energy?

Power as the rate of energy transfer, P = E / t, and efficiency as useful output over total input.
A CCEA GCSE Physics answer on power as the rate of doing work or transferring energy, the equation P = E / t, and how efficiency is calculated as useful output divided by total input.
11 min answer →

What does it mean to do work, and how is work related to energy transferred?

Work done as energy transferred by a force, the equation W = F s, and the link between work done and energy.
A CCEA GCSE Physics answer on work done as the energy transferred when a force moves an object, the equation work done equals force times distance, and how work links to energy transfer.
10 min answer →