Question 160: Current Electricity

Question

When a potential difference $$V$$ is applied across a wire of resistance $$R$$, it dissipates energy at a rate $$W$$. If the wire is cut into two halves and these halves are connected mutually parallel across the same supply, the energy dissipation rate will become:

Accepted Answer

$$\begin{aligned}
& \frac{\mathrm{v}^2}{\mathrm{R}}=\mathrm{W} \qquad 	ext{.... (i)}\
& \frac{\mathrm{v}^2}{\frac{1}{2}\left(\frac{\mathrm{R}}{2}ight)}=\mathrm{W}^{\prime} \quad 	ext{.... (ii)}
\end{aligned}$$
From (i) & (ii), we get
$$W^{\prime}=4 W$$

Answer

1/2W

Answer

4W

Answer

1/4W

Answer

2W

Current Electricity

When a potential difference $V is applied across a wire of resistance R, it dissipates energy at a rate W$. If the wire is cut into two halves and these halves are connected mutually parallel across the same supply, the energy dissipation rate will become:

Choose the correct answer: