Question

The following circuit diagram is partially incomplete.

The current in Lamp 1 is 0.4 A. The potential difference across Lamp 1 is 8.0 V.
Calculate the resistance of Lamp 1.
Group of answer choices

A) 30 ohms
B) 20 ohms
C) 2 ohms
D) 3 ohms

Answer 1

20Ω

Step-by-step explanation:

we are here given that,

• Potential difference= 8V
• current= 0.4 A
• Resistance= ?

From Ohm's law ,

`\implies V = iR \\`

where,

• V is potential difference
• i is current
• R is resistance

on substituting the respective values, we have,

`\implies 8V = 0.4A * R\\`

`\implies R =(8V)/(0.4A) \\`

`\implies \underline{\underline{ R = 20\Omega}}\\`

and we are done!