Edexcel IGCSE Physics 4.17 Power Equation Questions

Apply the power equation in heating, motion and turbine problems to relate transferred energy to the time taken or power available.

Exam points

Calculate mean or maximum power by dividing energy transferred or work done by elapsed time.
Rearrange P = E/t to find energy or time, converting minutes or hours to seconds.
For a 100%-efficient turbine, equate power to mgh per second to calculate the mass flow of water.

[Maximum number: 3]

Energy is transferred from the Sun to the Earth.

Solar panels use energy from the Sun to heat water.

Figure for Question Edexcel IGCSE Physics 4.17 Power Equation Questions question 1 — Edexcel IGCSE Physics

The total area of the solar panels is $15 \mathrm{~m}^{2}$ .

Each $1.0 \mathrm{~m}^{2}$ of the solar panels receives 1000 J of energy per second from the Sun. Show that the total energy transferred to the solar panels in 2 hours is about 100 MJ .

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Edexcel IGCSE Physics 4.17 Power Equation Questions question 1