Current Electri...

The temperature coefficient of resistance of a wire is $$0.00125$$ per degree celcius. At $$300K$$ its resistance is $$1$$ ohm. The resistance of the wire will be $$2$$ ohms at a temperature:

Most of the times we connect remote speakers to play music in another room along with the built-in speakers. These speakers are connected in parallel with the music system.
At the instant represented in the picture, the voltage across the speakers is $$6.00 V.$$ The resistance of the main speaker is $$ 8 \space \Omega$$ and the remote speaker has resistance $$ 4 \space \Omega$$
    The equivalent resistance of the speakers is

The effective resistance between $$A$$ and $$B$$ is

In a practical Wheatstone bridge circuit (Fig.), when one more resistance of $$ 100 \Omega $$ is connected in parallel with unknown resistance $$ x $$, then the ratio $$ l_{1} / l_{2} $$ becomes $$ 2 . l $$, is the balance length. $$ A B $$ is a uniform wire. Then the value of $$ x $$ must be

The value of e is

The equivalent resistance of the circuit across points A and B is equal to      

Six identical resistors are connected as shown in  figure .The equivalent resistance will be    

The length of wire of a potentiometer is 100 cm, and the e.m.f. of its standrad cell is E volt. It is employed to measure the e.m.f . of a battery whose internal resistance is 0.5 $$\Omega $$  $$. If the balance point is obtained at l=30 cm from the positive end, e.m.f of the battery is
Where i  is the current in the potentiometer wire.

When resistors with different resistances are connected in parallel, which of the following must be the same for each resistor? Choose the correct answer.

A metal wire has a resistance of $$10.0\Omega$$ at a temperature of $$20.0^{o}C$$. If the same wire has a resistance of $$10.6\Omega$$ at $$90.0^{o}C$$, what is the resistance of this wire when its temperature is $$-20.0^{o}C$$?