Question

Two resistors X and Y of resistances 2Ω and 3 Ω respectively are first joined in parallel and then in series. In each case the voltage supplied is 5 V.(i) Draw circuit diagrams to show the combination of resistors in each case.(ii) Calculate the voltage across the 3 Ω resistor in the series combination of resistors

Answer 1

i. This photo has the answer to the first part.

ii. We know the current in series combination remains constant.

Hence by OHM'S LAW,

V=I/R

(Here, R= R1+ R2= 2 ohm +3 ohm=5Ohm)

I=5V/5R

=> I= 1 A

Therefore,

For the 3 Ohm resistor

V= 1A(3Ohm)

V= 3 Volts