K.C.S.E Physics Q & A - MODEL 2006PP2QN21

K.C.S.E Physics Q & A - MODEL 2006PP2QN21

​(a) Figure 12 shows a section of a house wiring system

(i) Name:
The circuit labeled P 
The terminals labeled X and Y
X
Y
II Give a reason why R is connected to Y but not to X 
(ii) Why is the earthing necessary in such a circuit? 
(b) Determine the cost of using an electric iron rated 1500W, for a total of 30 hours given that the cost of electricity per kWh is Kshs 8. 

answers