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1.7.1a Energy stores and energy transfers

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Question 161

Two electric motors, M1 M_1\,M1​ and M2M_2M2​, are used to lift loads. The useful output power of both motors is the same. Motor M1 M_1\,M1​ is more efficient than motor M2M_2M2​. Which statement about the motors must be true?

A

Motor M1M_1M1​ can lift a load at a higher speed than motor M2M_2M2​.

B

Motor M1M_1M1​ has a greater input electrical power than motor M2M_2M2​.

C

Motor M1M_1M1​ uses less electrical energy per second than motor M2M_2M2​.

D

Motor M1M_1M1​ wastes more energy per second than motor M2M_2M2​.

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.

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