Question

A current of 3 amp. flows through the 2 ohm resistor shown in the circuit. The power dissipated in the 5 ohm resistor is:

• A. 1 watt
• B. 5 watt
• C. 4 watt
• D. 2 watt

Answer 1

The correct option is B 5 watt

Given,

Current in $2\Omega$ resister $=3A$

Potential across $2\Omega$ resister $V=IR=3\times 2=6V$

Potential is equal in parallel connection.

Current flow in $1\Omega \&5\Omega$ resister $i=\frac{V}{R}=\frac{6}{5+1}=1A$

Power dissipate in $5\Omega$ resister $=i^{2}R=1^2\times 5=5W$

Power dissipate in $5\Omega$ resister is $5W$