Question

Q2) An EMF source of 8.0 V is connected to a purely resistive electrical appliance (a light bulb). An electric current of 2.0 A flows through it. Consider the conducting wires to be resistance-free. Calculate the resistance offered by the electrical appliance. ​

Answer 1

Answer:

Explanation:

given :

Potential difference (v) = 8

Current (I) = 2A

V = IR

R=V/I

  =8/2

R=4 Ohm

Answer 2

Given : An EMF source of 8.0 V is connected to a purely resistive electrical appliance (a light bulb). An electric current of 2.0 A flows through it. Consider the conducting wires to be resistance-free.

To find : The resistance offered by the electrical appliance.

Solution :

We can simply solve this mathematical problem by using the following mathematical process. (our goal is to calculate the required resistance)

Here, we will be using the mathematical formula of Ohm's law. Which is -

V = IR

Where,

• V = Voltage across a conductor
• I = Current through a conductor
• R = Resistance of the conductor

In the given case,

• V = 8 volts
• I = 2 A
• R = ? (unknown)

By, putting the available data, in the above mentioned mathematical formula, we get :

8 = 2 × R

2 × R = 8

R = 8/2

R = 4 Ω

(This will be considered as a result.)

Hence, the resistance offered by the electrical appliance is 4Ω