Question

Draw a schematic diagram of a circuit consisting of a battery of three cells of 2V each, a 5Ω resistor, an 8Ω resistor, and a 12Ω resistor and a plug key, all connected  in series.

Answer 1

It is noted that the ammeter has been put in series with
the circuit and the voltmeter has been put in a parallel with12Ω  resistor.
(i) Calculation of current reading in the ammeter:

(ii) Calculation of potential difference reading across 12

Ω resistor. 

Current,I=0.24A,Resistance,R =12Ω, Potential difference,V =?
Applying Ohm's law
v = IR= 0. 24 x 12= 2.88 V
Therefore, the voltmeter reading is 2.88 V.

Answer 2

Three cells of potential 2 V, each connected in series, is equivalent to a battery of potential 2 V + 2 V + 2 V = 6V. The following circuit diagram shows three resistors of resistances 5 Ω, 8 Ω and 12 Ω respectively connected in series and a battery of potential 6 V.