The Sankey diagram represents the energy transfers taking place when an outdoor patio heater is operated.
What is the efficiency of the patio heater?
Why does the heating filament in the patio heater get hot when its electrical supply is switched on?
The power of the heating element in the patio heater is 2800 W2800\text{ W}2800 W when it is connected to a 230 V230\text{ V}230 V mains supply.
(i) State the equation linking power, current and voltage.
(ii) Show that the current in the heating element is approximately 12 A12\text{ A}12 A.
(iii) The plug of the patio heater contains a fuse. Fuses are available in values of:
3 A,5 A,10 A,13 A 3\text{ A}, \quad 5\text{ A}, \quad 10\text{ A}, \quad 13\text{ A} 3 A,5 A,10 A,13 AIdentify the fuse that is the most suitable for this patio heater, and explain why.
