Question

CHAPTER-12 ELECTRICITY (Resistors in series and parallel)
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Answer 1

Given that,

Three resistors are connected in series.

R₁=5 ohm

R₂ =10 ohm

R₃ =15 ohm

Voltage V = 30 V

We need to calculate the resistance

R = R₁+R₂+R₃

R = 5+10+15

R = 30 ohm

We need to calculate the current in the circuit

Using ohm's law

The current is directly proportional to the voltage.

V = IR

Where, I = current

V = voltage

R = resistance

Put the value into the formula

30  = I x 30

I = 1 A

Current through 10 ohm resistor will remain same that is equal to the total current in the circuit because the resistor is connected in series.

The potential difference across 10 ohm resistance,

V =IR

V =1 x 10

V = 10V

Hence, The potential difference across 10 ohm resistor is 10 volt.