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1.7 Energy, work and power

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Question 394

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 Energy, work and power Questions

  1. IGCSE
  2. /Physics
  3. /1.7 Energy, work and power

533 exam-style questions on CIE IGCSE Physics 1.7 Energy, work and power, covering 1.7.1a Energy stores and energy transfers, 1.7.1b Conservation of energy, 1.7.1c Kinetic and gravitational potential energy, 1.7.2 Work done, 1.7.3 Energy resources, 1.7.3a Energy resources and electricity generation, 1.7.3b Nuclear fusion as an energy source, 1.7.3c Efficiency of energy transfer, and 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.

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