The device which make use of heating effect of current flow through a resistor is

Factors on which resistivity depends :

There are n resistors, each of resistance R ohm. When all these resistors are connected in series, The equivalent resistance is \(R_{s}\). However, when the same resistors are connected in parallel, the equivalent resistance is \(R_{p}\). The ratio of \(\frac{R_{s}}{R_{p}}\) is

A gold wire is stretched to 100 times its original length. How will it affects the resistivity of the wire?

You have two resistors of resistance 6 Ω and 3 Ω. How will you connect these two resistors to get the effective resistance of 2 Ω ?

At constant temperature, electric current flowing through a given resistor is increased by changing the potential difference across its ends. What will happen to its resistance?

Which one of the following is not a factor on which heat produced depends?

You are given four wires. Wire A is made of copper, wire B is made of aluminium, wire C is made of manganin (an alloy) and wire D is made of tungsten. All four wires are of equal length and same thickness. Which one of these can be used in electric heating device?

Which one of the following is an incorrect statement about short-circuit?

Three resistors \( R_{1}\) , \( R_{2}\) and \( R_{3}\) joined to a voltage source V. Identify the correct statement.