K.C.S.E Physics Q & A - MODEL 2008PP2QN17

K.C.S.E Physics Q & A - MODEL 2008PP2QN17

​(a) Three resistors of resistance 2.0 ohms, 4.0 ohms and 6.0 ohms are connected together in a circuit.
Draw a circuit diagram to show the arrangement of the resistor which
Gives
(i) Effective resistance of 3.0 ohms 
(ii) Minimum resistance 
(b) In figure 11 the voltmeter reads 2.1 V when the switch is open. When the switch is closed, the voltmeter reads 1.8 V and the ammeter reads 0.1A.

Determine:
(i) The e.m.f of the cell 
(ii) The internal resistance of the cell 
(iii) The resistance of the lamp 

answers