Question

a.) freee resistors of resistances R1 R2 and R3 are connected i) in series ii) in parallel. write the expression for the equivalent resistance of the combination in each case. b.) two identical resistors of 12 Ohm each are connected to a battery of 3 volt calculate the ratio of the power consumed by the resulting combination with minimum aretwo identical resistors of 12 ohm each are connected to a battery of 3 volt calculate the ratio of the power consumed by the resulting combination with minimum R and maximum R .​

Answer 1

Resistor is used to convert energy to heat, helps in reducing the amount of voltage passes through a wire; even wire itself is resistor but with less resistance.

if they are connected in series it will offer more resistance, so that we will add them for getting total resistance.

if they are connected in parallel they will offer less resistance, so that we'll do the ratio between sum and product of the resistances.

V = I×R

a). series : RI+R2+R3

Parallel: 1/R1+1/R2+1/R3

b). v= 3 v

R1=R2= 12 ohms

I= v/r = 3/12 = 1/4