Question

When a potential difference of 20V is applied across a resistor, it draws a current of 3A If 30V is applied across the same resistor, what will be the current .

Answer 1

Answer:

Potential Difference =20V

Current=3A

Resistance =?

R=V/I

R=20/3

=6.67 ohm

Explanation:

Then

Potential Difference =30V

Resistance =6.67 ohm

Current =?

I=V/R

=30/6.67

I=4.497A

Answer 2

Given : When a potential difference of 20V is applied across a resistor, it draws a current of 3A If 30V is applied across the same resistor.

To find : The current.

Solution :

The current is approximately 4.498 A

We can simply solve this numerical problem by using the following process. (our goal is to calculate the amount of current)

Here, we will be using the formula of Ohm's law.

V = IR

• V = Voltage
• I = Current
• R = Resistance

Now, we have to calculate the resistance.

The resistance = V/I = 20/3 = 6.67 ohms (approx)

If, the voltage is 30V then the the current will be :

Current = V/R = 30/6.67 = 4.498 A (approx)

(This will be considered as the final result.)

Hence, the current is 4.498 A