A multi-socket extension board is used to run four appliances from the 230 V mains:
• LED lamp: 60 W
• Room heater: 1400 W
• Table fan: 200 W
• Laptop adapter: 100 W
All the appliances are connected in parallel across the supply.
(i) Calculate the steady current drawn by each appliance.
(ii) Determine the total current drawn from the mains when all four operate simultaneously.
(iii) The extension board can be fitted with either a 5 A or a 15 A fuse. Select the suitable fuse rating and support your answer with calculations.
(iv) Briefly state one electrical hazard that could arise if an incorrect (too high or too low) fuse were installed.