Edexcel A-Level Physics Efficiency Equations

Practise Edexcel A-Level Physics efficiency equations through useful-output ratios, motor power, solar-cell input, dissipated energy and percentage efficiency.

Exam points

calculate efficiency from useful energy or power output divided by total input
use VI, mgh/t, intensity times area or P=E/t to build input and output powers
assess energy-transfer claims by comparing useful, wasted and dissipated energy values

[Maximum number: 2]

The diagram shows a system used to move a stone block up a ramp. A team of people uses a rope to pull the block at a constant speed.

Figure for Question 1.3.22 - Efficiency equations question 1 — Edexcel A-Level Physics AS

height of ramp $=4.35 \mathrm{~m}$
angle of ramp to horizontal $=6.0^{\circ}$
mass of block $=2.10 \times 10^{3} \mathrm{~kg}$
speed of block up ramp $=0.450 \mathrm{~m} \mathrm{~s}^{-1}$
total power of team $=6.25 \mathrm{~kW}$

Determine the efficiency of the system.

Efficiency =

All question bank results loaded

1.3.22 - Efficiency equations question 1