A light bulb is rated at \(100W \)for a \(220 V\) supply. Find the resistance of the bulb
.
.
Answer
\(484\;\text{ohm}\)
To Keep Reading This Answer, Download the App
4.6
Review from Google Play
To Keep Reading This Answer, Download the App
4.6
Review from Google Play
Solution
As we know that
\(\text{Power}=VI\)
According to the question
\(P=100W \)and \(V=220V\)
By ohm's law \(V=IR\)
Current,
\(I=\frac V R\)
Than, \(P=V\times \frac{V}{R}\)
\(P=\frac{{V}^{2}}{R}\)
Resistance \(=\frac{{V}^{2}}{P}\)
\(=\frac{{\left. \left(220\right)\right. }^{2}}{100}\)
\(=484\;\text{ohm}\)
\(\text{Power}=VI\)
According to the question
\(P=100W \)and \(V=220V\)
By ohm's law \(V=IR\)
Current,
\(I=\frac V R\)
Than, \(P=V\times \frac{V}{R}\)
\(P=\frac{{V}^{2}}{R}\)
Resistance \(=\frac{{V}^{2}}{P}\)
\(=\frac{{\left. \left(220\right)\right. }^{2}}{100}\)
\(=484\;\text{ohm}\)
To Keep Reading This Solution, Download the APP
4.6
Review from Google Play
To Keep Reading This Solution, Download the APP
4.6
Review from Google Play
Correct14
Incorrect0
Still Have Question?
Watch More Related Solutions
The wave function, \(y_{n},l,m_{l}\) is a mathematical function whose value depends upon spherical polar coordinates \((r,\theta ,\varphi )\) of the electron and characterised by the quantum number n,1 and \(m_{l}\) . Here r is distance from nucleus, θ is colatitude and φ is azimuth. In the mathematical functions given in the Table, Z is atomic number and \(a_{0}\) is Bohr radius.
For \(He^{+}\) ion, the only INCORRECT combination is（ ）
For \(He^{+}\) ion, the only INCORRECT combination is（ ）
The figure shows a smooth pair of thick metallic rails connected across a battery of emf \(ε\) having a negligible internal resistance. A wire ab of length \(l\) and resistance \(r\) can slide smoothly on the rails. The entire system lies in a horizontal plane and is immersed in a uniform vertical magnetic field \(B\). At an instant \(t\), the wire is given a small velocity \(v\) towards the right. Show that after some time the wire \(ab\) will slide with a constant velocity. Find this velocity.
Load More
More Solution Recommended For You