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Question 15

A heavy-duty workshop cable reel is used to power outdoor machinery. The warning label on the drum states:

CAUTION

  • When cable fully unreeled: 2880 W2880\text{ W}2880 W, 240 V240\text{ V}240 V
  • When cable fully coiled on drum: 1100 W1100\text{ W}1100 W, 240 V240\text{ V}240 V
a.

State the equation linking power, current, and voltage.

[1]
b.

Complete the table by finding the missing current value, rounded to 1 decimal place:

Power (W)Voltage (V)Current (A)
110011001100240240240?
28802880288024024024012.012.012.0
[2]
c.

The cable reel plug is fitted with a 13 A13\text{ A}13 A fuse. Describe how the fuse protects the cable from damage.

[2]
d.

Explain why an 8 A8\text{ A}8 A fuse is not suitable for this cable reel when fully unreeled.

[2]
e.

Suggest why the maximum allowable power is lower when the cable is tightly wound on the drum.

[2]

Mains electricity Questions

  1. IGCSE
  2. /Physics
  3. /Mains electricity