Skip to content

Course home

Sign up

3.2 Dissipation and efficiency

EasyMediumHard
1234567891011121314151617181920212223242526272829303132333435
Question 21

An electric mixer receives the same input energy before and after a modification. Before the modification, the efficiency of the mixer is 60%. The modification reduces the energy dissipated by the mixer by 25% of its previous value.

What is the efficiency of the mixer after the modification?

[1]
A

85%85\%85%

B

70%70\%70%

C

75%75\%75%

D

30%30\%30%

Markscheme

3.2 Dissipation and efficiency Questions

  1. GCSE
  2. /Physics
  3. /3.2 Dissipation and efficiency

100 exam-style questions on Edexcel GCSE Physics 3.2 Dissipation and efficiency, covering 3.2.1 Dissipation of energy, 3.2.2 Reducing unwanted energy transfers, 3.2.3 Efficiency, and 3.2.4 Increasing efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank