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Energy transfers

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Question 44

An engineer tests the efficiency of an electric hoist used to lift a crate in an automated warehouse.

The engineer records the following measurements:

  • Current in hoist motor: 3.5 A3.5\text{ A}3.5 A
  • Potential difference across motor: 12.0 V12.0\text{ V}12.0 V
  • Time taken to lift crate: 8.0 s8.0\text{ s}8.0 s
  • Tension force needed to lift crate: 24 N24\text{ N}24 N
  • Vertical distance the crate was lifted: 4.9 m4.9\text{ m}4.9 m
a.

Calculate the electrical energy supplied to the motor during this time.

[2]
b.

State the equation linking work done, force, and distance moved.

[1]
c.

Calculate the work done on the crate.

[1]
d.

State the useful energy transferred to the crate.

[1]
e.

State the equation linking efficiency, useful energy output, and total energy input.

[1]
f.

Calculate the efficiency of the hoist.

[2]

Energy transfers Questions

  1. IGCSE
  2. /Physics
  3. /Energy transfers