Question

when a potential difference of 20 volt is applied across a given resistor it draws a circuit of 3 ampere if 30 volt is applied across the same resistor what will be the current​

Answer 1

Answer:

Step-by-step explanation:V1=20v

I1 = 3A V2=30

R=? I2 =?

V1=I1R

20=3×R

20\3=R

Now, V2=I2R

30=I2× 20/3

30×3/20=I2

9/2=I2

4.5=I2

So, current is 4.5 Ampere

Answer 2

Answer:

Current = 4.5 A

Step-by-step explanation:

Potential Difference = 20 V

Current = 3 A

Resistance = ?

According to Ohm's Law,

⇒ V = IR

⇒ 20 V = 3 A × R

⇒ R = V / I

⇒ R = 20/3 ohms

Now if Potential Difference is changed to 30 V with same resistance, current can be given as:

⇒ V = IR

⇒ I = V / R

⇒ I = 30 / ( 20/3 )

⇒ I = 30 × 3/20

⇒ I = 90 / 20 = 4.5 A

Therefore Current flowing in the circuit is 4.5 A.

Hope it helped !!