Question

What resistance must be placed in parallel with

a155-W resistor to make
theequivalent resistance 115-W?

Answer 1

A resistance of 445.625 ohm must be added in parallel

Step-by-step explanation:

Here unit of resistance is given watt which will be ohm

We have given equivalent resistance R = 115 ohm

Resistance of one resistor
`R_1=155ohm`

We have to find the value of
`R_2`

For parallel combination equivalent resistance is given by

`(1)/(R)=(1)/(R_1)+(1)/(R_2)`

So
`(1)/(115)=(1)/(155)+(1)/(R_2)`

`(1)/(R_2)=0.00224`

`R_2=445.625ohm`

So a resistance of 445.625 ohm must be added in parallel