K.C.S.E Physics Q & A - MODEL 2009PP2QN15

K.C.S.E Physics Q & A - MODEL 2009PP2QN15

​ Figure 9 shows the graph of the relationship between current I and potential difference V for two trungsten filament lamps X and Y. The normal working voltages for the lamp X and lamp Y are 2.5V and 3.0V respectively.

​(b) Determine the resistance of lamp X at the normal working voltage 
(c) The lamps are now connected in a series circuit in which a current of 0.4 A flows. Find the potential differences across lamp Y 
(d) Determine the power at which lamp Y operates under normal working voltage 

answers