Skip to content

Course home

Sign up

1.7.1a Energy stores and energy transfers

EasyMedium
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188
Question 139

The total power input to an electric motor is PPP. The power wasted by the motor is LLL. Which expression gives the percentage efficiency of the motor?

A

P−LP×100%\frac{P - L}{P} \times 100\%PP−L​×100%

B

LP×100%\frac{L}{P} \times 100\%PL​×100%

C

P−LL×100%\frac{P - L}{L} \times 100\%LP−L​×100%

D

P+LP×100%\frac{P + L}{P} \times 100\%PP+L​×100%

Markscheme

1.7.1a Energy stores and energy transfers Questions

  1. IGCSE
  2. /Physics
  3. /1.7.1a Energy stores and energy transfers

229 exam-style questions on CIE IGCSE Physics 1.7.1a Energy stores and energy transfers. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank