Question

What is the voltage lost to the 20 ohm resistor?

Answer 1

From the question, the voltage of the source, V =20 V

The total resistance of the circuit is, R=20 Ω+30 Ω+40 Ω=90 Ω

According to Ohm's law, V=IR

Where I is the current in the circuit.

Substituting the values of V and R,

`20=I*90`

Which gives us

`I=(20)/(90)=0.22\text{ A}`

Now we calculate the voltage across 20 Ω resistor.

We use Ohm's law again, but we will substitute R=20 Ω as we are calculating the voltage across the 20 Ω resistor.

`V_(20)=0.22*20=4.4\text{ V}`

That is voltage lost across the 20 Ω resistor is 4.4 V